Intelligent Obstacle Avoiding Robot || Step by Step Tutorial || Arduino Project 

That's fake it dose not scan left and write the servo is a dummy peice I read the program

Proof is that every time the robot senses something it turns only left

Try explaining it bro, the pinned comment is a lie

Hey friend. I think you have misunderstood. There is no fake or lie here in my channel. There are 2 videos. 1. Robot which doesnt scan left and right : ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-kPSBpfUpHt0.htmlsi=909Kf0mK6tRViWnP .. In this project, the robot doesnt scan left and right. It just detects obstacle and always goes in the left direction only. Servo is obviously a dummy piece. 2. The robot which scans both left and right is in this link : ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-k6W3FYxVS9E.htmlsi=RMY3UKpk0egZfDg6 .. Here the robot scans both left and right and goest to whichever direction which doesnt have obstacle. This video is what I have given in the pinned comment as robot with advanced algorithm.

@user-vq9md7xh3f Please reply if you have further doubts. I will be happy to clarify.

Thank you so much dear friend. Iam so happy that it worked for you..❤️🙂

Wow!!! Glad to know that. After seeing your comment, I was actually preparing the circuit diagram for uploading.

I will upload the circuit diagram so that the viewers get better clarity and can easily assemble the circuit.

Very happy to know that my video helped you to run the car. Please ask any questions and I will be happy to help.

If you liked the video, please subscribe for watching my future videos. Also, please share this channel with your friends who will be interested. Thank you. ❤

And love from India too..💞😍

Hehe..Thank you. I am very happy to read and reply to all the comments..🙂

Thank you so much dear friend for trying out this project by seeing my video. Glad that it worked for you..🙂

Hi dear friend.Thank you so much for the encouraging comment❤️🥰🙂. You can definitely increase the distance number to make the obstacle detection early.

@@Science_4U_ Thank you! I will try that tonight! 💙

Okay friend..🙂

Thanks a lot dear friend. Words cannot express my thanks to you. Thank you so so much!!!..😀😀😀🥰🥰😍

Hi friend. It is mostly due to poor batteries. Using new batteries should solve the problem.

Thank you...🥰💓

@@Science_4U_ i can't able to see Arduino code whose link you given in description so can you please send the code here

Hi friend.. It is definitely due to poor battery. When plugged into PC, the power to arduino board is taken from PC through USB. Hence the batteries are used to run the motors alone and it just rotates. But when PC is disconnected, the battery has to power both arduino and motor, which becomes difficult with bad batteries. Hence the motors dont rotate. If you start rotating the wheel, sometimes it will rotate..

So, the soluyion is to use new batteries. 9V small battery will work but will not last long. 4AA batteries will last longer. Best option is to use 2 x 18650 3.7V battery which are rechargeable also..

Ok thank you so much

Hi friend. You need at least 4 batteries if your are using AA batteries. that gives you 4 x 1.5 V = 6V input voltage. So if you are using AA 1.5V batteries, you need a holder with 4 batteries. Another better option is to use 2 x 18650, 3.7V batteries. If you use 18650 batteries, you have to use a holder with 2 nos. of 18650 batteries and it gives 7.4V output voltage.

Hi friend. I think it is most likely a battery related issue. The batteries are not able to run all the motors together. Generally a buzzing sound is heard when the motors don't get enough power for rotation. Are you using 4 motors or just 2?. Try removing all the motors and connect just 1. Is it working now?. Then it is confirmed that a poor battery is the problem. 2 x 18650 batteries are good. But the batteries may be bad or discharged so it is not able to drive the motors. I definitely feel that replacing with a good battery will solve this problem..

The motor driver needs to have 2 jumpers connected on ENA and ENB pins. The jumpers should be present for the working of the motor driver. Are the jumpers available? Also to check whether the motor driver is working, connect IN1 pin to +5V of arduino and IN2 pin to GND pin of arduino. Power on arduino and motor driver board. If the motor driver is working, the motors should rotate now.

It is very well possible. I have done several projects by connecting the SSD 1306 OLED display to arduino. You can watch those projects to see how the connection is done with the OLED display. then you can also open the code and see how code is written for OLED display. You have to combine both the code so that if an obstacle is detected, the required text is to be displayed on screen.

Hi friend. Most likely it is a battery problem. When you are connecting uno through usb, the arduino board, the servo and sensors are powered feom usb. The battery then powers only the motors and hence even if the battery is discharged ot works fine. Are you using the servo motor too?. Can you remove connections to servo and can you check whether it is working now?.Replacing with a powerful battery should solve the problem.

Hi friend. Thank you for the nice words. I will surely start making drones👍

Thank you so much dear friend..🙂❤️

Thanks again and again ❤🎉🎉😊😊😊

I am subscribe your video and like

Iam doing comment in onether phone that phone is my mother's phone

@rahseedap8268 Thank you so much friend for liking and subscribing to my channel. If you like my channel, please share with your friends so that those who are interested can watch these videos. Thank you so much friend..❤️🙂

Hi friend. Most likely it is a problem with the l298n motor driver board. It may be faulty. Have you used it before or is it a new one?Also can you see 2 jumpers in place in the motordriver board, connecting ENA and ENB pins to the pins above that?. Those jumpers are required for enabling rotation of motors..

it is too much for the project friend. A total voltage upto 12V is fine. 2 x 18650 or maximum 3 x 18650 is okay. Beyond that, it will damage the board and motors.

@@Science_4U_ Thank you

Okay friend. I will take care for reducing music in the future videos. Thanks for the suggestion..🙂

I can't get it from description

@@lankaranaraja8203 okay friend. then I will paste the code below. #include Servo Myservo; #define trigPin 9 // Trig Pin Of HC-SR04 #define echoPin 8 // Echo Pin Of HC-SR04 #define MLa 4 //left motor 1st pin #define MLb 5 //left motor 2nd pin #define MRa 6 //right motor 1st pin #define MRb 7 //right motor 2nd pin long duration, distance; void setup() { Serial.begin(9600); pinMode(MLa, OUTPUT); // Set Motor Pins As O/P pinMode(MLb, OUTPUT); pinMode(MRa, OUTPUT); pinMode(MRb, OUTPUT); pinMode(trigPin, OUTPUT); // Set Trig Pin As O/P To Transmit Waves pinMode(echoPin, INPUT); //Set Echo Pin As I/P To Receive Reflected Waves Myservo.attach(10); } void loop() { Serial.begin(9600); digitalWrite(trigPin, LOW); delayMicroseconds(2); digitalWrite(trigPin, HIGH); // Transmit Waves For 10us delayMicroseconds(10); duration = pulseIn(echoPin, HIGH); // Receive Reflected Waves distance = duration / 58.2; // Get Distance Serial.println(distance); delay(10); if (distance > 15) // Condition For Absence Of Obstacle { Myservo.write(90); digitalWrite(MRb, HIGH); // Move Forward digitalWrite(MRa, LOW); digitalWrite(MLb, HIGH); digitalWrite(MLa, LOW); } else if ((distance < 10)&&(distance > 0)) // Condition For Presence Of Obstacle { digitalWrite(MRb, LOW); //Stop digitalWrite(MRa, LOW); digitalWrite(MLb, LOW); digitalWrite(MLa, LOW); delay(100); Myservo.write(0); delay(500); Myservo.write(180); delay(500); Myservo.write(90); delay(500); digitalWrite(MRb, LOW); // Move Backward digitalWrite(MRa, HIGH); digitalWrite(MLb, LOW); digitalWrite(MLa, HIGH); delay(500); digitalWrite(MRb, LOW); //Stop digitalWrite(MRa, LOW); digitalWrite(MLb, LOW); digitalWrite(MLa, LOW); delay(100); digitalWrite(MRb, HIGH); // Move Left digitalWrite(MRa, LOW); digitalWrite(MLa, LOW); digitalWrite(MLb, LOW); delay(500); } }

Thanks

Ooh..great dear friend!!!.. So happy to hear that💓🙂

Hlo sir it is really working

I want to ask how was the code uploaded

Hi friend..The code can be uploaded by connecting to PC or laptop. Then open the code in IDE software and click on upload button. It will get uploaded to arduino..

@@KoiTheFish888 Hi friend. Have you tried downloading the code from both the links?. Can you give your email id?. I will send the code.

Okay friend. I was telling about the colours that are generally given for servo motors.. Yellow/orange for signal wire.. Red for +5V Black/brown for gnd.. In the servo motor that I used, the colour of signal wire was yellow but generally it comes with orange wire..also the servo motor that I used had brown ground wire.But some motors come with black ground wire..so that why I told black colour though the servo motor that I used had brown ground wire..

@@Science_4U_ Not about colors, Just check the connection to IOREF. The audio is telling not IOREF. May be its not audible clearly. I am talking about the Violet /Purple wire (middle one ) from the servo motor. Anyway it is working fine now. Your code is also working fine. Thanks

Ooh..okay friend.. anyway IOREF is a reference 5V that is to be given to input output devices. So IOREF is actually same as +5V..That is why I told +5V only. Also in SMD versions of arduino +5V only is written. There is no IOREF. So as a general term I told +5V. Thanks friend for pointing out..👍

@@Science_4U_ Thanks friend. My son had a knowledge fair in School today. He used your video to make the same Robot. He presented it successfully. Thanks a lot.

@@pmm782003 Thank you so much..Very happy to know that..🙂. Please do convey my regards to your son..💓

Hi friend..While spinning whether both the motors are rotating but in opposite directions?. Or only one motor is rotating?.

First of all, after detecting an obstacle, it goes back and does not go forward again, it spins in a circle, at that time both the motors spin.

Please help me

@@TheJayasiri yes..can you tell..without the obstacle in front ..just after switching on ..are both the motors rotating in same dirrection or opposite directions..

It is done ,thank you for replying 😊

Hi friend. Thank you so much for the nice comment..💓 Most likely the ultrasonic sensor is not working. The servo motor is given just to give the feeling of looking to both left and right after detecting the obstacle. If the servo motor is not there also it will work. But ultrasonic sensor is very important for proper functioning. Just check the connections to ultrasonic sensor once again. If it is correct and still not working, then most likely this sensor is faulty. Changing it should solve the problem..

@@Science_4U_ I changed it it worked thank you.❤ but another problem occurred all lights are on but nothing is moving what should i do please answer its for my project?

I checked the motors alone and its working whats the problem?

It is moving in a circle in port 1 and 2 only

Hi friend. Can you explain the problem clearly?. Do you mean that both motors are rotating but in opposite directions?

What is the problem that you are facing friend?. Is it not moving at all?

Okay. Was the "upload successful" message shown after you uploaded the code?. Was the code uploaded without any errors?.

yes the code was succesfully uploaded

no errors

the servo motor we use is second hand, its from a friend, she said it works fine because they tested it

we'll try to reset the arduino uno again, replace the ultrasonic sensor, replace the 4* double a batteries with 3.7 V rechargeable and replace the motor driver what other advices can you give?

Hi friend..you need not do anything in the code. Just attach 2 more motors in the front. The wires coming from the front motors can also be connected to the motor driver board alongwith the wires coming from the back motors..I have done a similar project with 4 motors. You can watch that video below for better understanding.. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-JK6zTM65Rh0.html But only problem I have seen with 4 motors is that it is a bit difficult to turn.

@@shatha.44 Hi friend.There could be several reasons why it is not working.The L298N driver board may be faulty or it could even be the batteries. You can message me in my instagram account. I will help you to solve the problem. instagram.com/_science4u_?igsh=MTM5aXFpdTM5aG5lNg==

I guess it could be due to poor batteries only. When it is going backward, since both wheels are working, the connections are correct. In the forward direction both motors are not rotating probably due to poor batteries. You can try changing the batteries.

@@Science_4U_ I facing this same it circles all the time but when turning it is fine, changed the battery still the same issue.

Thank you dear!!!🙂🙂❤️❤️❤️

Hi friend. In this code, the commands for running the motors go from pin numbers 4,5,6&7 of arduino to the motor driver board. So pin numbers 4,5,6&7 are responsible for the motors to run..

Regular arduino will work friend.

Hi friend. There could be many reasons why it is not starting. You have to check one by one to find out. The most common problem could be L298N motor driver board. Have you used it before or is it a new one? . It could be faulty. Also, in the motor drive board, there should be 2 jumpers in place connecting ENA and ENB and the pins above them. that is for enabling rotating of the motor. If the jumpers are not there also, the car wont start. Also, check whether the batteries have charge in them.

Thank you so much dear friend..🙂❤️

Hi friend. There could be many reasons why it is not starting. You have to check one by one to find out. The most common problem could be L298N motor driver board. Have you used it before or is it a new one? . It could be faulty. Also, in the motor drive board, there should be 2 jumpers in place connecting ENA and ENB and the pins above them. that is for enabling rotating of the motor. If the jumpers are not there also, the car wont start. Also, check whether the batteries have charge in them.

Where does the middle red wire of the servo motor go to?

Yes ftiend. You will be able to use photoelectric proximity sensor but definitely needs modification in the code.

No friend. I dont have a video for only the code. If you have some doubt, please tell the problem by visiting my following instagram page. I will help. instagram.com/_science4u_?igsh=MTM5aXFpdTM5aG5lNg==

Hi friend. Do you mean that it is not detecting obstacles?

Hi friend. There are 2 types of servo motors. 1. Positional servo motor which can rotate only 180 degrees and 2. Continous rotation servo motor which can rotate 360 degrees. In this project you have to use the first type. But I think you have used the second type. That is why it is keeping on spinning. Please check.

Okay friend..The problem could be most probably due to bad batteries. Please use new batteries and problem should be solved. Also check whether the connection from batteries are correctly given to the motor driver board.👍

Okay friend..Can you check whether there are 2 jumpers connected on ENA and ENB pins in motor driver board?. They act as swiches for enabling the rotation of motors. Without these jumpers in place, the motors won't rotate. So first can you check that?

@@Science_4U_ thanks for your help bro I was using used motor driver in which those jumper were removed i connected ant it is working .thanks a lot

@@user-jb1xc8sv9v ooh..great to know that friend..Happy to know that it worked..🙂

Hi friend. You don't need a servo motor for this to work. No need to change the code also. Just fix the ultrasonic sensor alone in front. The connections for the servo motor to arduino alone can be ignored.

Thank you very much 💀 I was really shocked by your quick answer . Thank you very much ​@@Science_4U_

Hmm..okay friend. There could be many reasons. 1. The motor driver board could be faulty. Have you used it before or is it a new one? 2. Are the batteries new?. If the batteries are discharged, then also it will not work. 3. Check the connections once again.

Can I keep a picture to your number that you can see and everything are new I had also tested them

Hi...Can you tell whether the led light in the L298N motor driver board is also turning on?

​@@Science_4U_no sir, the light in the motor board isn't turning on

And sir, when I uploaded the code, only the servo motor just rotated backwards and didn't work

@@srilatha.b7752 okay. The light in the motor driver board should have actually turned on. Can you check the power connection to the motor driver board?. Are the +ve wire from the battery connected to +12V terminal of the motor driver board & -ve wire from the battery connected to GND terminal of thr motor driver board? By just giving power to the motor driver board correctly, the red light in the motor driver board should have turned on.

@@srilatha.b7752 Also can you tell whether you are using the same 4 x 1.5 V battery pack?. Are the batteries new ones?. If there is insufficient voltage, then also the motor driver board will not work.

Please say something. On my motor driver, it's showing red led light, someone said it means that my motor driver is receiving low or high current, so it's shutting down himself. Am new to this, can you help me please. If you can give me your handle, I can send you my connection, so that you can put me through. Thank you so much

I'm using a raspberry pi pico

Hi, friend. I am not knowledgable in using raspberry pi pico. If you are using arduino uno for this project, I can help you.

Okay friend. Then it is confirmed. The reason why only one motor is working is due to discharged batteries. When you connect uno to PC, the uno, sensors and servo are powered by PC. So more battery power is available for rotating the motors and hence both motors rotate. With the uno disconnected from PC, the batteries have to power everything together. So it becomes difficult to rotate both motors together. So change to a new battery and the problem will be solved.

Sir I use a new battery then also the problem is there

Sorry friend, I did not understand the question. Which is the adaptor that you are talking about?.

Hmm. Okay friend. If you bring hand near the ultrasonic sensor, is the rotation changing?.

Yes the sensor moves right and left when it detects something in front of it. But the car would only go backwards

@@PulkuGaming okay friend. It is very easy to correct that problem..Just interchange the wire connections of the motors at both sides of the motor driver board. Is it working correctly now?

@@Science_4U_ don’t get what to do

@BeatBox_Raps Don't worry friend. Czn you come in instagram?. I will chat and help you solve the problem. Following is my instagram id.. instagram.com/_science4u_?igsh=MTM5aXFpdTM5aG5lNg==

You can download the code from the following link.. drive.google.com/file/d/11FJMN_PGLD_yJdtuzxBiAzmhhfKUOvxV/view?usp=sharing

i Have also changed the motor Driver too

Okay friend. I think the battery may not be powerful enough to rotate both thr motors together. Can you lift the robot in you hand and try rotating the wheel which is not rotating. Do you feel like it is starting to rotate or there is no rotation at all?. Also alongwith the battery, connect uno to usb also. Now are both wheels rotating?. Most likely i think it should be due to poor battery.

I have also lifted up sir but only one wheel is rotating but if I give direct connection to the battery then it is rotating

@@SHIVKUMAREASWARB okay friend. Can you do one thing?. In the motor driver board, remove wires from IN1 & IN2 and connect to IN3 and IN4. Also remove wires frim IN3 and IN4 and connect them to IN1 and IN2. Is the other motor now rotating?.

Hi friend. It is called hot melt glue stick. I will give the link below. 11MM TRANSPARENT HOT MELT GLUE STICKS FOR DIY AND CRAFT WORK (14 STICKS) amzn.in/d/8xtvnkT

No problem friend. Cardboard should be strong enough to support all components..

Ok❤

Hi friend. You can power the ultrasonic sensor from the 5V output of l298n. But definitely it cannot give enough current to the servo motor. So it is better not to connect servo motor to this 5V output.

Thank you dear friend..❤️🥰🙂

Okay friend. That is great..!!!🙂❤️

plz help me . I have to submit it tomorrow.

Hi friend. There could be some problem with the l298n motor driver board. We have to check and see if the l298n motor driver is working or not. Can you see 2 jumpers in l298n motor driver that is connected to ENA and ENB pins?

Hi friend. This could be due to several reasons. 1. Can you see 2 jumpers very close to the IN1 and IN4 pins in motor driver board?. These jumpers are required for enabling the rotation of the motor. 2. The L298N motor driver board may be faulty. The lights will switch on, but still it may not work. Have you used this motor driver board before, or is it a new one?

Hello dear friend. For all the projects, the code can be downloaded from link given in the description box below the video..🙂

Hi friend,surely I will help. I think that is due to poor batteries. When we keep on the floor, the motor consumes more power from the batteries. So this drops the input voltage and hence it stops working again. Have you used fresh AA 1.5 V x 4 batteries? If possible can you change to 2x 18750 3.7V rechargeable batteries?. Those are the best for these kind of projects.

Hi friend. The servo motor could be faulty. Replacing the servo motor shoukd solve the problem. Before that please check whether the connections to servo motor are given correctly. Are the servo motors jerking atleast or it is not moving at all?

Hi friend. I will surely help. My first doubt is the motor driver board. Is the motor driver board used before or is it a new one?. Sometimes the lights could be ON, but if the motor driver is faulty, the motors just wont run.

Have you used the servo motor also?. Atleast is the servo motor turning to left and right when you place your hand in front of the ultrasonic sensor?

Also, can you check whether the rotation enable jumpers are put in place in the motor driver board. There will be 2 jumpers kept on the ENA and ENB pins of the motor deiver board. If those jumpers are not there also, the motors wont turn.

@@Science_4U_ I checked my ultrasonic sensor is not working for now, the motor driver is new btw and is it because of ultrasonic sensor that nothing is working or there is also some other fault present in the circuit?

@@xyzabc7241 There is some other fault friend. Even if the ultrasonic sensor was not working also, the motors should have rotated continously. I have another doubt. Was the code uploaded properly?. If the code was not uploaded correctly, nothing will work.

Hi friend, the bot is supposed to go in straight line only. There is some change in the pin connection I think. Can you confirm that one motor is rotating in forward direction and one motor is rotating in backward direction?. Or is it that one motor is stationary and another motor is rotating in forward direction?

Also since these are not servo motors, there is no way to change the speed using code. You can only reduce the power supply voltage, which will inturn reduce the motor speed.

@@Science_4U_ one is rotating forward and other is backward

@@maheshwarverma9806 okay.. understood. Then there should have been an interchange in the pin connections..

@@maheshwarverma9806 Please intetchange 2 pins of the control pins of the motor driver board and see if the motor direction is changed to forward. If the other motor changes direction, then interchange the other 2 pins.

Okay friend. There could be several reasons why the DC motor is not rotating. Most probably it could be related to the motor driver board.Please check the following. Do you see light on the motor driver board? Are there jumpers connected to ENA and ENB pins in motor driver board?. Is it a new driver board or an old one which has already worked before?

Hi friend..please check the connections once again. If the connections are correct and servo is not working, then it could be a problem with the servo motor. Replacing the servo motor will solve the issue. Also see if the servo motor is working with arduino connected through USB. If it works, it means that the batteries are not good and not able to drive servo motor. When arduino is connected through USB, the USB supply powers it and hence it gets sufficient power to rotate. Please check these things..

It should have definitely worked with 3.7v x 2 batteries. Have you used the ardino board and motor driver board before? Or is it new one?. Sometimes the boards can be faulty even if the lights turn on.

Also you can try interchanging the command pins from the arduino board to the motor driver board. The connections could have got interchanged. Also, if you have a multimeter, you can check whether the digital commands are going to the motor driver board by checking the voltage.

Okay friend. If you dont have jumper near to IN1 and IN4 pins, you can use a jumper wire to function as a jumper pin. Can you share a photo of your motor driver board in the following instagram id. I will help. instagram.com/_science4u_?igsh=MTM5aXFpdTM5aG5lNg==

@@Science_4U_ Thank you sir

Terima kasih teman💓🥰🙂

If the robot is moving then the jumper should be there connecting the ENA and ENB pins to the pins just above it. If only left motor is rotating, mostly the battery could be discharged so that it is not able to rotate both motors together. Can you lift the robot in hand and try rotating the non rotating wheel and helping it to rotate. Is it rotating now?. Also keep the uno connected using usb cable and try. Whether both wheels are rotating?

sir my robot is working only USB is connected yo arduino

Yes sure friend. It will work. 👍

Hi friend. The Motor speed can be controlled using PWM by removing the 2 ENABLE jumpers at the motor control pins and giving a PWM signal in that pin. I will give below a link to a very detailed article on this. Please go through that and ask me if you have any further questions. I will be happy to help!!!

howtomechatronics.com/tutorials/arduino/arduino-dc-motor-control-tutorial-l298n-pwm-h-bridge/

Those are enough. But will not last long. 2nos. Of 18650 batteries are a better choice.

Both IOREF and 5V are one and the same. Both pins give 5V output. You can use 5V pin instead of IOREF pin.

It could be some loose connection or problem with the motor driver board. Is it detecting obstacle correctly?. Also if you remove ultrasonic sensor, is it continously going to front without stopping?. Can you check that?

Hi friend. It is detecting obstacle using an ultrasonic sensor in front. When the obstacle is detected, it reverses changes direction and then moves forward, thus avoiding the obstacle. The algorithm for this is written in the code..

Thank you...🥰☺️

Okay friend...

That is definitely because the batteries are discharged. When connected to laptop, the arduino, sensors and servo motor gets its power from laptop and the battery needs to run only the motor and so it works. So even if battery is slighly discharged, it will work. Changing to new battery will solve the problem friend.

Thank you bro❤😊😊

Thankyou thank you for your best information ❤❤❤❤❤❤❤❤😊😊

Thank you dear friend.❤️🥰🙂

@@Science_4U_ Thanks for the response, I love your videos. All are so good. Also can you try watching @ghosthumovies? - the content is pretty good

Hi friend. If the motor works when the arduino is plugged to computer USB port, the most likely it is a battery problem. The battery is discharged and not able to drive the motors. When it is connected to USB, it is getting additional power and thus the motor rotates. Changing the battery to a good one should solve the problem..

@@Science_4U_ hi . I use a New battery but the motor still doesn't work

@@mohammedbj9226 Hi friend. To my understanding it should be definitely due to the bad battery. When you are connecting to battery alone, are the lights in UNO and motor driver board turning ON? Also , when it is connected to batteries alone, can you just try starting rotation the motor with hand?. If it is rotating after you rotate with hand, it again shows that it is a bad battery. Can you please try this?

@@Science_4U_ yes the light turning for both the uno and motor driver board and i try mov it with my hand but won't move i started think it's an uno board proplem

Yes friend, sure. Speed is proportional to the input voltage given to the motors. We can reduce the speec by reducing the input voltage. What is the battery pack used now? How many batteries are you using?

@@Science_4U_ i used 2 batteries of 3.7 volt which means total input 7.4, 18650-1200mAh li ion cell

Hmm. Okay. If you want to further reduce speed, you can use a battery pack with 4 AA 1.5V batteries. That will be a total of 6 volts.

If you want to further reduce the speed, you have to use a different battery for the motors alone. In my project, i have used same power supply. You can use your 18650x2 powerpack for powering the arduino uno+servo motor+ultrasonic sensor. Arduino requires minimum 6V at input, so you have to use battery with more that this voltage. For the motors alone, you can use a separate battery with lower voltage. You can use a single 3.7V 18650 battery also for the motors which will drastically reduce the speed.

Hello friend..From what you have told, the connections are done correctly. Most likely, the ultrasonic sensor may be a faulty one. Have you used this sensor without any problem before? If it is the first time that you are using this sensor now, then most likely it should be a faulty one. Replacing it should solve the problem..

@@Science_4U_ Thank you🙏

Hi friend, the ultrasonic sensor and motor driver board connection to arduino requires 4 nos male to female jumper wires. Whereas the servo motor to arduino connection requires 3 Nos. male to male jumper wires..then 2 nos. male to male jumper wires for transferring power from motor driver board to arduino.

Thanks 👍

Hi friend. Make sure you have to select the correct board under the tools menu in IDE software. Also, in the tools menu, the correct port for uploading the code also has to be selected. Then try reuploading the code. If it again shows the same error, you can try redownloading the code and again upload. Some change in the code could have happened because of some mistake. Still if the same error is occcuring, you can try changing the USB port or try a different PC /laptop.

Yes friend. You can use 3 batteries. Only thing is that the motors will be rotating fast. You can use just 2 batteries if you want slower rotating speed.

@@Science_4U_the robot do not move only i feel a pulse in the motor

@adawymohamed okay friend. Can you do one thing?. Can you lift the car in your hand and try rotating the motor. Is the motor rotating once you help to start its rotation?

Hi friend. There could be several reasons why it was not working properly. Can you tell me what is the problem. Is it not moving at all?. Or is it not detecting obstacles. I will help.

Hi friend. Is your CH340 a regular sized Arduino board or a nano board?. Instead ot IOREF another pin should be there in its place labelled 5V. Is there a pin like that?

@@Science_4U_ I use also a 2pcs of 3.7 batt 183650 still should i put that at 5V?

@@joannrosemalalis1374 Yes friend. The sensors are powered from the 5V outputs from arduino board. So if you are able to find any 5V pin in arduino board, you can use that to power the sensor.

Code, connection everything is ok, circuit is getting the power supply but the car is not moving, I'm using 4 pieces of 1.5 V battery

@@poojak12 I have used AA 1.5V batteries only, 4 nos..

But Li ion batteries are better. 2x 18650 3.7V batteries are better for this application.

@@poojak12 There can be many problems friend.We have to check one by one. Can you message in my instagram profile?. I will help..My instagram profile link is given below. instagram.com/_science4u_?igsh=MTM5aXFpdTM5aG5lNg==

Yes ..sure friend..But they dont last long and they are not rechargeable too..

Yes definitely friend. Just connect red wires of two left motors together and connect to one terminal at left side of l298n motor driver board..Connect black wires of two left motors together and connect to other terminal at left side of l298n motor driver board..Do this for right side motors also.

You can watch my following video for connecting 4 motors to l298n motor dtiver board... ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-JK6zTM65Rh0.html

Hi friend. For this project, I used 4 Nos. Of 1.5V AA batteries. It will be better if you can use 2 Nos. of 3.7V 18650 batteries as they are rechargeable and last really long.

Hi friend. Since none of the components are working correctly, i strongly suspect that there can be a problem with uploading the code correctly. Was the code uploaded properly to arduino??

@@Science_4U_ yes i have done that as well. the code was uploaded correctly

@@wasiqhussain7712 hmm..okay friend..then we have to see in detail..if possible can you share some photos of the connections in my instagram id..I will check and help you in solving the problem.

@@Science_4U_ before that i would like to ask u that is it possible that even the motor driver is blinking when provided voltage ,it can be a faulty piece of board?

@@wasiqhussain7712 Yes sure friend. It is possible.. I have seen many cases like that.

Hmm yes friend..Sure!!! Just attach 2 more motors + wheels in front and connect the wires from these motors also to the L298N motor driver board. The wires from both left motors to be connected to the left side terminals of the L298N motor driver board. And wires from right side motors to be connected to the right side terminals of L298N driver board.