Arduino and ESP32 Serial Communication || UART Communication

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In this video tutorial, I will show How to Exchange Data between Arduino and ESP32 using Serial Communication?
Serial communication is a process of data transmission sequentially through a communication channel or bus.
At least one serial pin is available in every Arduino and ESP board. The pins are named TX and RX pins. TX stands for transmitting, and RX stands for receiving.
For detailed steps and Arduino code, visit www.programmingboss.com/2021/...
Serial communication is also known as UART Communication. The Arduino UART Communication and ESP32 UART Communication work together through the operation voltage are not the same.
To establish serial communication between Arduino and ESP32, we can cross-connect the TX and RX pins of Arduino with ESP32.
Overview:
The video demonstrates serial communication between Arduino and ESP32, showcasing how to establish a connection and exchange data. It covers ESP32 and Arduino Uno, highlighting their compatibility for serial communication. The tutorial focuses explicitly on UART communication with ESP32, including ESP8266, and Arduino, illustrating how to transmit and receive data through the serial interface. It explores the UART communication protocol, explaining its significance in establishing reliable data transfer between devices. The video also touches upon nodemcu and Arduino UNO serial communication, showcasing their interoperability. Additionally, it provides an overview of ESP32, discussing its features and applications. The tutorial offers a comprehensive guide to implementing UART-based serial communication between Arduino and ESP32.
#esp32 #arduino

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Опубликовано:

28 апр 2021

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Комментарии : 147

@nataliealonso2381 Год назад

excellent tutorial thank you very much! how would be the code to connect two ESP32? via serial communication

@Hacks360 Год назад

The code will be similar to the given an example here: www.programmingboss.com/2021/04/esp32-arduino-serial-communication-with-code.html

@payalpal4386 Год назад

@@Hacks360 In my case, the ESP32 module , at first showed result which were mentioned in its own loop but failed to receive the data from UNO.

@ChathuYasas 5 месяцев назад

There were errors in serial data that I get many times also in my projects. So I think this is a great tutorial.

@Hacks360 5 месяцев назад

Happy to help you with serial communication. Thanks for your comment.

@hamermohd6884 2 года назад

Thank you for the clear and fantastic tutorial.

@Hacks360 2 года назад

You are welcome. Please stay connected and subscribe. Thanks.

@tiaradvm 3 месяца назад

Thank you very muchhhh!!!!! Your video helps me😭

@Hacks360 3 месяца назад

You are most welcome. Stay connected by subscribing to our channel.

@mjuliana100 2 года назад

Hello, thank you for the video. But I have found different information in some videos, why some videos recommend to connect RX of arduino with TX of esp32, and other recommend to connect RX of arduIno with RX of esp32?

@Hacks360 2 года назад

*TX* and *RX* are abbreviations for *Transmit* and *Receive* . If Arduino Transmit , ESP32 should Receive. Again if ESP32 Transmit something, Arduino should Receive. Which means, that *TX* of Arduino should connect with RX of ESP32 and *RX* of Arduino should connects with *TX* of ESP32. Cause while Arduino Transmit some message, ESP32 should Receive it through *RX* . I hope you got the answer. Thanks for your comment. Please *subscribe* and stay connected.

@mjuliana100 2 года назад

@@Hacks360 Thank you so much, but in this video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-q-KIpFIbRMk.html they say that TX of arduino should be connected to TX of ESP32-CAM, and the same with RX. It is sad to find different information from videos that have a lot of views

@rayleblanc7209 2 года назад

Can you use the esp32 to upload sketches to the arduino mega wirelessly and receive serial monitor info back wirelessly ?

@Hacks360 2 года назад

Arduino mega don't have wifi or bluetooth.

@rayleblanc7209 2 года назад

@@Hacks360 If the esp32 is serial communicating with the arduino and the esp32 is a wireless module, does that not create a wireless access to the mega?

@lazyvideos9525 3 года назад

is it essential software serial at receiver side????any way i have default serial port like UART0 so i can use that both side transmitter and receiver side also right??? while programming my be i should remove the tx rx ....pls upadte on this???

@Hacks360 3 года назад

In receiver side, you just need to read serial input. In UART communication, there should be 2 pins. By the way, you can use the example to test. Yes, while programming, you should remove RX0, TX0. If there is multiple tx rx, you have to remove only tx0 and rx0. Because most of the time programmer uses tx0 and rx0 to upload the program in the controller. Sometimes removing only RX0 can also work.

@e-splash Год назад

Does it okey to directly connect the RX and TX of Arduino Uno and ESP 32S without using a voltage divider??

@Hacks360 Год назад

It is generally not recommended to directly connect the RX and TX pins of an Arduino Uno and an ESP32 without a voltage divider or a level shifter. This is because the logic levels of the two devices are different, and the Arduino Uno uses 5V logic levels while the ESP32 uses 3.3V logic levels. Connecting the two devices directly could result in damage to the ESP32.

@Mystical-TEDDY_ Год назад

the music go kinda hard 🔥

@Hacks360 Год назад

Thanks, keep your volume a little low.

@floringaspar6740 2 года назад

Please help me man. I'm trying to transmit data from esp32-cam to the Arduino Pro Mini. I use a 5v to 3.3v voltage divider for Rx and TX pins. The data is transmitted for a few seconds, only after I disconnect the pin. Otherwise this communication does not work. I also tried at 5v voltage, without divider, the problem is the same.

@Hacks360 2 года назад

Try changing the wires and try again. It should work. The idea of using a 5v to 3.3v voltage shifter is great. Keep trying. Thanks, and stay connected.

@zgryx8428 2 года назад

Hi sir thank you for the wonderful tutorial, how can I trigger the esp32 cam to capturr photo with the command of Arduino? is it possible? if so, how?

@Hacks360 2 года назад

Yes, it's possible.

@zgryx8428 2 года назад

@@Hacks360 could assist me sir how to do that? Thank you so much❤️

@user-fh2xd8br9q Год назад

I am using esp32 with arduino mega 2560, however when I run the code I don't get any output on the esp32 serial monitor, I connected TX1 of arduino mega 2560 to RX (GPIO3) on the esp32. If you can please help with this

@Hacks360 Год назад

You must use *tx0, rx0* of Arduino mega which are digital pin 1 and 0. Otherwise, you have to define serial1.begin(9600) instade of Serial.begin(9600); . The right hardware pin must define in the code to establish the connection and start serial communication.

@JoseMideros Год назад

Greetings, very nice video. Very didactic and educational. I am running as in the video, but I am not getting any result. Maybe the Board inside the Arduino, I do not choose it well, could you guide me please. I have a: ESP32 38 PINES /// NODEMCU ESP-32S V1.1

@Hacks360 11 месяцев назад

Try again...

@rayenbensaid9365 2 года назад

Good job man . Please i want to send data from arduino uno to Pc using the esp32 Bluetooth. Is it possible by this UART communication ? thank you

@Hacks360 Год назад

Yes, possible.

@lailanadira2664 Год назад

hello, can the esp32 connect with stm32 through serial ? and esp32 send notifications through telegram by using stm ?

@Hacks360 Год назад

Yes, it's possible.

@bryanangelobragais2498 2 года назад

sir thank you for your video. can i ask about esp32 how to send data using Arduino + esp32 to android

@Hacks360 2 года назад

There is multiple way, In cause of arduino, you can use bluetooth module and gsm module to send data. Using ESP32, you can send data using wifi, bluetooth, and gsm. Thanks.

@carlosmedrano9190 Год назад

its secure to connect directly the TX of ESP32 to the RX of Arduino, have problem with the voltage?

@Hacks360 Год назад

No, you are right. It's unsafe to directly connect the TX of ESP32 to the RX of Arduino. It would be best if you stepped down the voltage using a voltage divider.

@Mystical-TEDDY_ Год назад

@@Hacks360 u said tis safe if they share a common GND tho?

@Hacks360 Год назад

@@Mystical-TEDDY_ You need a common GND between Arduino and ESP32.

@marinekid9 Год назад

Hello, when I copied and pasted the code, I get an error message saying that " 'Serial2' was not declared in this scope." Any suggestions?

@Hacks360 Год назад

Can you please post the comment in our blog with screenshot. It will be easy to give the solution. Thanks. www.programmingboss.com/2021/04/esp32-arduino-serial-communication-with-code.html

@marinekid9 Год назад

@@Hacks360 Hello, yes I can do that. But before I do, could it because I need a voltage divider to go from 5V to 3.3V? That's what I am thinking. Please let me know your thoughts, thanks!

@GentiGace 2 года назад

Very useful video but can you tell me the inverse from esp32 to arduino. thank you.

@Hacks360 2 года назад

In the description, there is a link. The process is pretty same. The connection also same.

@mertkayahan4153 Месяц назад

Hello, I am doing a project. I want to connect Arduino mega with esp32 and send an analog signal from esp32 to the PS gamepad. So, how can I send an int or double variable instead of a string expression from esp32 to arduino?

@Hacks360 Месяц назад

The value will go as String. Just convert that in your desired data type. As simple as that.

@nasralhubishi5080 2 года назад

Hello. I want to make the esp32 the sender and arduino mega is the reciver, in other way i want the opposite of this video please...

@Hacks360 2 года назад

Please comment on your problems and query on the website. Thanks, and stay tuned.

@longphan5652 Месяц назад

This is great video. But them can activity if you not connect with PC to show terminal then led blink on arduino from data of arduino .

@Hacks360 Месяц назад

Can you please clearify your question again. Also please visit my website for more details. Thanks

@hfe1833 Год назад

How about voltage level in DIO? Arduino is 5v and 3.3V in Esp32

@Hacks360 Год назад

If you follow the website and go through the tutorial, I have explain the matter. You must use a voltage divider to step down the voltage from the *Arduino Uno to the ESP32* . Please visit: www.programmingboss.com/2023/01/serial-communication-between-arduino-and-esp32-CAM-UART-data-communication.html Thanks

@hfe1833 Год назад

@@Hacks360 very good documentation bro,thank u

@Hacks360 Год назад

@@hfe1833 You are welcome, bro. Please subscribe to support us. Thanks

@kangkamal8220 3 года назад

it's safe for esp? cause digital signal from arduino has 5v and working device for esp is 3.3v

@Hacks360 3 года назад

For safety, you can use resistor to drop the signal voltage level. But it's working fine if we use a common GND between Arduino and ESP32. Thanks for your comment.

@kangkamal8220 3 года назад

@@Hacks360 ahh.. Thanks.. :D

@Mystical-TEDDY_ Год назад

@@Hacks360 what OHMS resistor should I use?

@Hacks360 Год назад

@@Mystical-TEDDY_ You can use 2:1 ratio resistor. Like 10k and 20k resistors for the voltage divider. Please visit: www.programmingboss.com/2021/04/esp32-arduino-serial-communication-with-code.html

@muhammadhazrolhafifibinabd1693 5 месяцев назад

Hello, does this mean i connect the android app to esp32, then the data received transfer from esp32 to arduino and arduino to esp32 and to android app?

@Hacks360 5 месяцев назад

Yes, you can do that.

@carlospachecocruz8142 9 месяцев назад

what would be the pins if I use tx0 and rx0

@Hacks360 7 месяцев назад

We have used hardware serial pins for both Arduino and ESP32.

@sagunrai8689 Месяц назад

Hey, when sending continuous data, the ESP32 monitor is only showing the initial data…please help

@Hacks360 Месяц назад

Did you able to communicate with esp and Arduino? Please follow the blog for details. Also let me know how can I help...

@rodo19724 2 года назад

I want to send FROM esp32, to arduino uno, doesn't work. Is it because rx from esp32 is 3.3 v?

@Hacks360 2 года назад

Maybe it's the reason. Please try using voltage shifter in tx and rx. Thanks for your comment.

@user-em6lu1pb4k 3 месяца назад

I followed the tutorial but output in esp32 cam print only ;"Message Received: " without the message should recevied from arduino . What is the problem ? Please help me 😢😢

@Hacks360 2 месяца назад

Please check the connection again. For more details and codes, please visit the website.

@Mat69MX 2 года назад

i want to connect sensors to esp32, and connect esp32 to arduino 33 iot, from there connect it to a display, and using the arduino 33 iot free access to arduino cloud with the esp32 sensor information, is it possible?

@Hacks360 2 года назад

Yes, possible. You can do it in several ways. If you want to communicate with the esp32 wirelessly, you can send data from esp32 to Arduino using the MQTT protocol. In that case, you have to use the Arduino ethernet module to connect with the same network. Or you can use wifi module to do so. You can also do it if you want to use tx RX or serial communication. But it's recommended to add a logic level shifter between Arduino and esp32 as the esp32 logic level is 3.3v and Arduino logic level is 5v.

@user-jx6vh6ye4r 10 месяцев назад

Hello, can we use blynk app with this method? Thanks in advance

@Hacks360 10 месяцев назад

Yes, you can

@yingxuan7238 Год назад

Hi, can you show how to connect ESP32-CAM and arduino via UART ?

@Hacks360 Год назад

The process is the same. Though, I will try to make a video on it. Subscribe and stay connected. Thanks.

@yingxuan7238 Год назад

@@Hacks360 subscribed, thank you in advance.

@user-im7et7mi8o Год назад

thank you so much!!

@Hacks360 Год назад

Thank you so much. *Subscribe* and stay connected.

@user-ff7bj6tr9j 2 года назад

Excuse me, I copied it, why does exit status 1 appear? 'Serial2' was not declared in this scope?

@Hacks360 2 года назад

It should work. Can you please comment on the blog? Thanks

@user-ff7bj6tr9j 2 года назад

@@Hacks360 I'm sorry, I don't know it's inconvenient to send you an email?

@programmer1111x Год назад

@@user-ff7bj6tr9j place the declaration of serial2 outside the void setup(). Outside of any function

@yasinbyker Год назад

I have a problem. if i send data to esp32 faster than 1000 milliseconds. I'm having trouble reading this fast incoming data. How can i solve this problem

@Hacks360 Год назад

The baud rate should be the same at the sender and receiver ends. Otherwise, the data should arrive usually. Please remove any delay on the receiver side which can interrupt the data receive.

@floringaspar6740 2 года назад

Is this communication working without connection to the pc?

@Hacks360 2 года назад

Yes, of course.

@leonardo5854 Год назад

how about communicating eps32 with arduino uno via Bluetooth?

@Hacks360 Год назад

Soon going to write article about it. Please keep eyes on the blog. www.programmingboss.com

@plcchileplc2061 Год назад

que pasa con la diferencoa de niveles de voltaje

@Hacks360 Год назад

You have to use a voltage divider to step down the voltage. Please follow this link for more details: www.programmingboss.com/2023/01/serial-communication-between-arduino-and-esp32-CAM-UART-data-communication.html

@BlasterGames 16 дней назад

How can 5v arduino tx to 3.3v esp32 rx not damage the esp32?

@Hacks360 12 дней назад

Your concern is valid and surely it will be destroyed. Please visit the website for details. Thanks

@thestarangel4443 4 месяца назад

this code is giving error Compilation error: 'Serial2' was not declared in this scope but i write same code which u described in video. can you please resolve it

@Hacks360 4 месяца назад

Select the board properly. You should get this error if there is no hardware serial in your board.

@devangpandit3 3 месяца назад

Uploading is done but we are not getting "Hello boss" at esp32 !! Side... How to fix this?

@Hacks360 3 месяца назад

It should work. Please check the board and check the connection. Don't forget to use common ground between Arduino and ESP32.

@devangpandit3 3 месяца назад

@Hacks360 yeah it's done !! Thanks a lot 😄

@Hacks360 3 месяца назад

You are most welcome. Subscribe and stay connected.

@requiem4adreamc Год назад

I want to make arduino pro micro as Bluetooth hid. I have esp32 and pro micro. How can i do that?

@Hacks360 Год назад

To make an Arduino Pro Micro act as a Bluetooth HID device using an ESP32, you can follow these steps: Connect the ESP32 to the Pro Micro via serial communication as described in the previous answer. Upload the ESP32 code to create a Bluetooth HID device. There are several libraries available for this purpose, such as the ESP32 BLE HID library or the ESP32-BLE-Gamepad library. These libraries allow you to create a Bluetooth HID device with custom button mappings, joystick controls, and more. Once the ESP32 code is uploaded and running, it will act as a Bluetooth HID device and appear as such to any nearby Bluetooth-enabled device. In the Pro Micro code, read input from whatever sensors or buttons you want to use to control the Bluetooth HID device. Then, send HID reports to the ESP32 over serial communication. The HID reports should contain information about the state of the buttons or joystick axes. The ESP32 code will receive the HID reports and send them out over Bluetooth to the connected device. By following these steps, you can turn an Arduino Pro Micro into a Bluetooth HID device that can be used to control a computer, phone, or other Bluetooth-enabled device.

@requiem4adreamc Год назад

@@Hacks360 Thank you very much for detailed explanation. 🤝🙂

@Hacks360 Год назад

@@requiem4adreamc You are welcome. Please support us by subscribing to the channel. Also, visit: www.programmingboss.com/ Thank you.

@requiem4adreamc Год назад

@@Hacks360 I already subbed and i will check out the website for sure :)

@junantan2870 2 года назад

Here you only show esp32 receive data from arduino. It's possible for arduino receive data from esp32?

@Hacks360 2 года назад

Of course possible.

@junantan2870 2 года назад

@@Hacks360 tq！

@Mindtrendss 2 года назад

@@Hacks360 hello thx you for your information, can i get a code?

@rodo19724 2 года назад

@@Hacks360 Can you show us HOW ?

@youssefyasser1929 Год назад

can u show us more because i need to send mpu6050 data from esp to Arduino mega ,

@Hacks360 Год назад

Follow the article on how to send data from *ESP32 to Arduino* . The website link is: www.programmingboss.com/2021/04/esp32-arduino-serial-communication-with-code.html Then first, connect the two devices by connecting the TX pin of the ESP32 to the RX pin of the Arduino Mega and the RX pin of the *ESP32* to the TX pin of the Arduino Mega. After connecting the devices, initialize the Serial communication on both devices with the same baud rate. Once you have the data from the *MPU6050* sensor, you can send it to the Arduino Mega using the Serial.write() function on the *ESP32* . On the *Arduino* Mega side, you can use the Serial.read() function to receive the data sent by the *ESP32* . If you need more help, please comment on the website. Thanks and please *_subscribe_* .

@youssefyasser1929 Год назад

@@Hacks360 Thanks it works, can it be done wireless, using wifi module or Bluetooth on Arduino Mega?,do you have anything that will help on this

@Hacks360 Год назад

@youssefyasser1929 Nice to hear that it's working. You can connect Arduino and esp32 over *Bluetooth* or Wi-Fi. There are some challenges, though. You can follow this resource on Bluetooth Communication Between the *ESP32 and the Arduino* . www.programmingboss.com/2023/01/bluetooth-communication-between-esp32-arduino-hc-05-bluetooth-module.html Thanks, and stay connected.

@youssefyasser1929 Год назад

@Hacks360 hello again, I tried the code but they dosenot pair with each other

@taunaudaunau4844 4 месяца назад

hey i followed all the steps but in serial monitor im getting "�� 0��2��0��0��D2�0�d2d6(��0�� Lpd6�(�\t�wD:�J�8��0�D2`��`7��3� d6��2c��2��Lpd2��d7�" such output on the esp32 end any way to fix that ?

@Hacks360 4 месяца назад

Please check your baud rate.

@taunaudaunau4844 3 месяца назад

@@Hacks360 i did keep it 115200 yet it gives me ��f�8��(��

@corna1906 Год назад

I have this issue using your receiving code on my esp32

@Hacks360 Год назад

Can you please comment your questions on the website? Link in the description.

@binayakbishnu 2 месяца назад

People who couldn't receive message One possible problem could be that it is said while uploading code Rx Tx pins should not be connected to anything.

@Hacks360 2 месяца назад

That's right, It would be an issue while uploading the code. Another thing is that there should be a common grounding between Arduino and esp32.

@Rohit-cd9vf 6 месяцев назад

Compilation error: 'Serial2' was not declared in this scope This shows when I'm uploading the ESP32 code

@Hacks360 5 месяцев назад

The error you're encountering, 'Serial2' was not declared in this scope, indicates that the Serial2 object is not recognized in your code. This usually happens when you're trying to use the second hardware serial port (Serial2), but it hasn't been properly defined for the ESP32. The ESP32 boards typically have multiple hardware serial ports, and Serial2 is commonly available. However, to use it, you need to include the appropriate ESP32 library and use the correct pin assignments for UART communication. Here's an example of how to use Serial2 on ESP32: // Receiver ESP32 Code void setup() { Serial.begin(115200); // Serial for USB communication Serial2.begin(115200, SERIAL_8N1, 16, 17); // Serial2 for external communication (TX: 16, RX: 17) } void loop() { if (Serial2.available() > 0) { String message = Serial2.readStringUntil(' '); Serial.print("Received message: "); Serial.println(message); } }

@brianalmeida529 2 месяца назад

Communication is very good, but never do it without using a voltage divider. I followed step by step what he did in the video and unfortunately when transmitting from the arduino to the esp32cam, it damaged the board due to the difference in voltages.

@Hacks360 2 месяца назад

I have mentioned that on my website. You are right. The esp32 can be fried due to overvoltage.

@brianalmeida529 2 месяца назад

@@Hacks360 Yes sir.

@ayeshaemdad1612 3 года назад

Good job

@Hacks360 3 года назад

Thanks! Stay connected.

@ms64578 2 месяца назад

Nice job. Is it dangerous to ground these two boards to each other? I thought the eso32 works on 3.3 v

@Hacks360 Месяц назад

Yes, you are right. Please visit my blog for more details. Please subscribe to support me.

@merlinn64 3 года назад

This is possible with Esp32-Cam?

@Hacks360 3 года назад

Yes. But to avoid risk, you can use resistor to drop the signal voltage level. Thanks, and stay connected.

@thirty-twobits Год назад

bro your music is a little dark, but thanks!

@Hacks360 Год назад

Thanks for your comment.

@sevketkarayilan 7 месяцев назад

Where is serial1?

@Hacks360 7 месяцев назад

For which controller you are looking for serial? Arduino? For Arduino it's tx and Rx pin. For esp it's gpio 1 and gpio 3.

@larissanzogang1473 3 года назад

The esp32 does not match🤔

@larissanzogang1473 3 года назад

Esp 32 code

@Hacks360 3 года назад

Select the proper board.

@mako3010 Год назад

Link is FULL of ads. Messy channel.

@Hacks360 Год назад

Thanks for your feedback. Going to organize soon.

@mako3010 Год назад

@@Hacks360 I get it - you have to make money. But the amount of ads you have on that link are ANNOYING AF

@Hacks360 Год назад

@@mako3010 Thanks again! Just ignore ads and focus on the content. Thanks.

@mako3010 Год назад

@@Hacks360 Its the principles. Not supporting creators that rely on ads ON TOP of RU-vid's ads. I'll find better content elsewhere, from someone who isn't here to make a quick buck.

@Hacks360 Год назад

@@mako3010 Seriously, men? Now it's getting funny and childish.