How to use millis() function to multitask in arduino code. 

Brilliant. Thankyou. Just the depth of explanation I was looking for.

Good presentation....! I come from C#... C# has a function called ,"background worker". I believe this millis() is just what I need for some of my code in Arduino..

very well explained, just what I was looking for. Thanks!

much better than the "paid course I've enrolled"

Well, I was able to understand the video. Now, I have to try and adjust so I can get the right frequency for the first set of LEDs. If it doesn't work, I may have to get a separate board so I have better control of what I want. I'm trying to make a costume and I have get the frequency of the lights just right in accordance to the show.

I feel like It can be explain in more detail but I manage to understand and this is what I was looking for

a simple idea but absolutely KEY to doing complicated projects involving reading multiple sensors with different accuracies (at different sample rates).... I was doing it this way before but I like your idea better: if (millis() >= time_HS + HS_INTERVAL) { //as soon as time ('millis()') greater than the time of the last heart beat check plus 20 milliseconds run another heartbeat check time_HS += HS_INTERVAL; //add (another) 20 milliseconds to time_HS to mark the time of the last heart beat check obviously instead of adding the HS interval "manually" to a running total you can just use millis() :p. thanks a lot for the tip!!

Explained in good manner with example 👍👍

Thanks exactly what I’ve been looking for!

This video has solved many doubts. Thanks You Sir.

Hi Mario. Your filmy are very helpfull and made in very interesting way. Thank You!

Very useful project helping me understand programming. I am just starting using and programming arduino. I will download and study the code. Many thanks.

one new subscriber.. I was using until today.. thank you a lot.. by the way you gained a new subscriber

Hey there I think you had the right right idea but i noticed there was a slight error with your code when you showed to the example of two leds with separate frequencies. It should look something like this unsigned long ms_from_start = 0; unsigned long ms_previous_read_LED1 = 0; unsigned long LED1_interval= 1000; unsigned long ms_previous_read_LED2 = 0; unsigned long LED2_interval=250; #define LED1 2 #define LED2 3 int LED1_state =0; int LED2_state =0; void setup() { // put your setup code here, to run once: pinMode(LED1,OUTPUT); pinMode(LED2,OUTPUT); } void loop() { // put your main code here, to run repeatedly: ms_from_start = millis(); if (ms_from_start-ms_previous_read_LED1>LED1_interval){ ms_previous_read_LED1 = ms_from_start; if(LED1_state == 0){ LED1_state =1; digitalWrite(LED1,LED1_state); } else{ LED1_state = 0; digitalWrite(LED1,LED1_state); } } if (ms_from_start-ms_previous_read_LED2>LED2_interval){ ms_previous_read_LED2 = ms_from_start; if(LED2_state == 0){ LED2_state =1; digitalWrite(LED2,LED2_state); } else{ LED2_state = 0; digitalWrite(LED2,LED2_state); } } }

It was a very very useful tutorial 👍

With millis() you can use unsigned ints to measure intervals up to 65.535 seconds. 8 bit millis only returns 250 different values, the low 8 bits never == 255 but you can use type byte for fast calculating led fades for instance. Because the millis() clock low 8 bits takes 250ms to roll over, the next bytes count 1/4 seconds exactly. If I want a 1 second repeat I watch the bit that changes every half-second, it is 1 every second for 1/2 second. Use in a state machine. These cooperative tasking techniques are old. When i was beginning in the 80,s I was reading Creative Computing and Intel design notes from the late 70's... AVR core at 16MHz is about 20x as fast as a C64. Count how many times void loop() runs every second and print it. Is it more than 60,000?

Cool, thx for shearing ur knowledgewith us, this tutorial was very useful

Well explained , Big Thanks Bro .

thank you a lot.

Amazing knowledge sir....you are great..

Great. Thank you

Thanks for the video. Very good

Such a gr8 video it is...thank you so much💯

Oh yea I’m a new subscriber

Thanks a lot, very clear.

I wounder what real world applications I could do with this? maniacal robotic applications sounds fun.

Hello sir, good evening, Am creating a program 20Khz PWM signal for pump. It's absolutely working fine, when I wrote 2nd millis function and upload same board but 2nd program is not properly worked. Any solution for this sir ? Am using Arduino UNO board.

Good 👍

Best vid

Good explanation!

Thank so much I am very Enjoy it.

What if in the first if statements the start - previous = interval instead of using > ? In that case, would the LED blinking be precise?

thanks!

Thank you, easy to understand, Auto sub...

hi I used your code its work good ,I need a help after reaching the some counter value the both blink need to stop and jump to next set of led or port

very well explained. now i have a confusion if the on & off delay time is different in both cycle. like for a 7 sec cycle o/p-A will on for 1st 5sec and off for last 2sec and o/p-B will off for 1st 2sec and will be on for last 5sec. how i can code this using millis() in UNO?

Sir, how to make timer ? Specifications are 20 second on 60 minutes off This on and off in looping. On-off switch for timer stop. Keypad required for setting timer. Parts available Arduino UNO Keypad LCD 16*2 On-off switch for timer

What if I just want to print something on lcd 16x2 using millis? I want to have alternate of 5secs clock display and 3secs temperature humidity display.. I dont have int LED1_state=0 and just using lcd.print functions. I am having difficulty in the part 5:31 on the video.. And planning to add also temperature controlled switch, to turn on the fan in certain temperature.. Pls help :(

Great! Ahhh, but can we do that method and change the duty cycle, for instance, on 100ms, off 900ms?

how would we add more leds to the code?

Is it possible to blink both leds at exactly the same time using two different pins?

Is there a benefit to declaring pins with #define instead of the standard "int somepin = somenumber;"?

this is cool..but i cant define my outputs as im using shift register..soo can i do the millius which shift register

Wondering how to make the led1 blinks only 5 times and then switch off forever until certain activity execute again

Thanks for the video. Very good. I have a question. I want to use a push button and trigger a relay for 100 ms or other value of ms. For the project of one battery spot welder. Do you have any project similar? Thank you for your time.

hello Is there a way with the millis() for the LED tourn ON OFF only 5 ones?

Can you give me a hint. How can I add a pause where nothing happens for 40 seconds then the program starts your code.

please i need this code with different on & off time used to two LED..please can you?

this just saved me another nano for a project... boy, and I thought every task needs another µC... those little bastards are plenty capable

How do you deal with the situation where millis() overflows and is reset to 0? I mean in a life system that would be ON for more than 50 days.

Hi Mario, great vids, and another subscriber, I've merged to codes one using buttons and the second to run a sequence of RGB Leds using millis, both functions work beautifuly seperatly but when I want the buttons to turn the code on and run the sequence I have to push and hold the button until it completes or it stalls when I release the button, any ideas why

the arduino ecosystem needs a scheduler. without it all you can do is wait for your lowest allowable jitter, and that's awful for trying to write low power applications.

pls multi step motor ( 4 pcs )

Hi, Great explanation. But I have a question, when i put same time interval for the both millis functions, is possible to run both functions in same time without lagging?

You could simplify ' if (LED2_state==0) LED2_state=1; else LED2_state=0;' with 'LED2 = !LED2' and similarly with LED1 😀

This is not multi tasking, it is one task, to be a real multi-tasking, both loop need to be in different function