Arduino - Turn LED On and Off With Push Button

[@nataliagrabowieckialetti5034]

Thank you so much. I needed to program something for the school where I had to set up the button as you explained. In no video I have found a programming that detects when you press the button to turn on a light and then another press to turn it off. Thanks again. Keep explaining this kind of stuff, it's worth it.

[@aofddofa6661]

i logged in to hit like and thank you .. not one of best but the far best of all

[@Pewpewz]

Hey, fyi to make it even simpler instead of your if -> then -> else you could do ledState = !ledState

[@smalburg1]

Would delay(50); at the end of the if-condition not have done the job instead of the extra variables?

[@navb0tactual]

THANK YOU SO MUCH! Instead of an LED, I used this on an 8 part Relay to power my LED Strips. I do have a problem where if I accidentally jiggle the wires it thinks a button is pressed, but that's likely the cheap breadboard/crappy duponts. If you're doing the same I had to put my delay to 1000 milis otherwise it was going crazy. (It's interesting at first, but a great way to damage them.)

[@FlockofSmeagles]

I did the same thing, but they take way longer to actuate now, lol.

[@navb0tactual]

@@FlockofSmeagles Yeah the next day mine just turned on and off without pressing the button... I love coding... I'll see if I can figure out why, but I have very little faith in my coding capabilities (or lack thereof lol) Also I actually put mine on 1250 milliseconds, which is 1.25 Seconds... I actually like the delay for some reason, but I can see that being incredibly annoying.

[@navb0tactual]

@@FlockofSmeagles I figured it out... I'm wildly dumb, I also didn't touch it since my last comment. I skipped the circuitry section because I was eager to get this to work that day. My coding wasn't the problem, it was the wiring. I forgot to add the 5v to the button lol, curiously it worked the first time for 5 minutes, but never again after that. Now it is fixed and I have it set to 500 milliseconds, however I'll edit this to get the lowest one without any bouncing. The reason it first but then wasn't working is because I'm in a small room surrounded by electronics, the interference caused by them made the button go crazy. I'm very new to this so I had no clue. I was dealing with a "floating pin" problem I'm using an Elegoo 8 Part relay so I'm not sure if this will help with yours but I'll link what I found and hopefully KZbin doesn't get mad at me. Like the guy in the GIF, I was able to actuate the button without pressing it. This stuff is so interesting. makeabilitylab.github.io/physcomp/arduino/buttons.html#the-floating-pin-problem kzbin.info/www/bejne/ranNlqV5fah4g8k&ab_channel=AddOhms Hope you got yours to work better otherwise. Hopefully this helps if you haven't! Edit: I got it down to 10 Milliseconds with it only bouncing once from 10 presses. I can give you my code if you want. Idk if that'll work on here but I can try

[@CoderDad]

You may also have grounding or power supply problems. Try running on batteries for a clean DC supply.

[@v1bonoxd]

yo man if you still can, can you send me a code?@@navb0tactual

[@TJenga]

Very nice, could you make one where you have 2 leds and 2 buttons where button 1 changes led1 state and button 2 changes changes button 1 to change state for led 2 ?

[@weltroyt1270]

that would be nice for me also

[@lokyilau3126]

Hi, thank you so much for your detailed instruction! But I don't know why it even lights up without me pressing the button. When I press it, it gets lighter. How can I solve this issue tho? Thank you so much!

[@ahmedahmed-rd2lj]

More helpful than the paid course

[@ShivrajKarkera91]

I still don't understand why do we need that 10k resistor, while the pushbutton simply breaks the circuit when it's not pressed.

[@modular_warfare_remastered3657]

Pull down resistor

[@AashirwadTyagi-ch4me]

Yes bro i am also have this question

[@ShivrajKarkera91]

@@AashirwadTyagi-ch4me I figured it out bro. It's for making sure that arduino receives only 2 values, either 5v or 0v, from the pushbutton. Without the resistor, arduino might receive "floating" states or in-between values due to electrical noise, that can cause confusion and misbehaving of the circuit. When the button is not pressed, the resistor PULLS DOWN the reading to 0 volts, preventing false reading. Also it is said that the resistor prevents short circuiting by limiting the current, when button is pressed, coz it's directly connected to both terminals.

[@lastchance045]

I enjoyed the video and was finally sucessful in running the code on my Arduino Uno. I think it was unnecessarly difficult to extract the code from the video considering the many "back and forth" journeys in the coding. One set-back was caused by the use of different coding styles, e.g. (#define led #define button) & (#define LED_PIN #define BUTTON_PIN) Here is the code I ended up with Thanks Turn on the LED when the button is pressed & keep the LED on unless the button is pressed again. If the button is pressed again the LED will remain off unless the button is pressed again. The on & off state of the LED will toggle each time the button is pressed. #define LED_PIN 8 #define BUTTON_PIN 7 byte lastButtonState; byte ledState = LOW; unsigned long lastTimeButtonStateChanged = millis (); unsigned long debounceDuration = 50; //millis void setup () { pinMode(LED_PIN, OUTPUT); pinMode (BUTTON_PIN, INPUT); lastButtonState = digitalRead(BUTTON_PIN); } void loop () { if (millis () - lastTimeButtonStateChanged >= debounceDuration) { byte buttonState = digitalRead (BUTTON_PIN); if (buttonState != lastButtonState) { lastTimeButtonStateChanged = millis(); lastButtonState = buttonState; if (buttonState == LOW) { //released if (ledState == HIGH) { ledState = LOW; } else { ledState = HIGH; } digitalWrite(LED_PIN, ledState); } } } }

[@sas-inventions7969]

Thanks bro i have issue and you solved it on minutes🧡

[@FlockofSmeagles]

I've done this. Except with 5 buttons and LEDS. The debounce doesn't seem to work consistently a crossed all of them. is this because of how they are being called in the code? Is there a way to call each button and led block within an array? If you see this. I would appreciate your help, thank you.

[@bloodlinks7137]

Well, i use another debounce system that i think would work better for your case than the on in the video. Instead of using millis(), i use a bool system, let me give you an example: if (debounce == false) { // Checks if debounce is on or off debounce = true; // If its off, sets it true digitalWrite(13, ledState); // Turns led on or off delay(1000); // This is the debounce duration, i put 1000 miliseconds debounce = false; // Sets the debounce off after the designated time has passed } I am not sure if you can or not but i believe that you can implement this to multiple LEDs, probably you'd have to create 5 different bools

[@oliverjanssen1700]

Very well explained. Thank you.

[@xdevil8382]

Can we use IR sensor instead of push button?

[@elaprimo1]

This helped me out, thanks.

[@nerdtowncity5930]

If I wanted to wire this up without the bread board how can I do it in regards to the ground? Would I split the ground on the switch? Or how can I do that?

[@RoboticsBackEnd]

in this case you need to find a way to connect all grounds (maybe by soldering?)

[@lxgb01]

What a brain power ! Great stuff

[@Zeu_99]

I replaced the push button with an electric wire, but when I short-circuited the electric wire, it turns on, and when I don't, the led turns off, but once I short-circuited, the led keeps turning on, so can't I replace it with an electric wire?

[@CoderDad]

The button is to act as a "momentary" contact, that is to say you push it down for a fraction of a second and let it go again. This code is not designed for the buttong to be held down continuously. To use a wire for continuous contact try this code in the Loop: if(digitalRead(BUTTON_PIN) == HIGH){ digitalWrite(LED_PIN, HIGH); } else { digitalWrite(LED_PIN, LOW); }

[@GoogleGoogle-ni9ww]

why the green led light is at d3 and d4 in the diagram at 4:11 and at 5:39, the actual green led light is at different place?. I'm a beginner and super confused....

[@Initial_Depressed]

how would we change the code to where the led would only flash five times?

[@sudenazerdogan5258]

It should light up when the user presses the button once, and then go out when he presses it again. However, if the user presses the button again within 5 seconds, the LED should turn on and turn off after 5 seconds. how can I do that

[@CoderDad]

You have store the time of the first button press in a variable. You also have to store the number of presses in another variable. Then you test with (psuedo code) "If (ButtonPressCount >= 2 AND ButtonTimer

[@Chaos_Nova]

Why not use state machine and task implementation?

[@jakerooni5542]

what do i do when there's two buttons and two LEDs?

[@CoderDad]

copy the code and add two more ports. Change the copied code to reference the two new ports.

[@CoderDad]

//My code version: #include #define LED_PIN 8 #define BUTTON_PIN 3 bool LedState = false; //bool - the state can only be ON or OFF. void setup() { pinMode(LED_PIN, OUTPUT); pinMode(BUTTON_PIN, INPUT); } void loop() { if(digitalRead(BUTTON_PIN) == HIGH){ //if the button is pressed enter if# delay(250); //small delay for button bounce. LedState = !LedState; //set LedState to be not what it is. } digitalWrite(LED_PIN, LedState); }

[@eliasnedelea232]

how could i put a countdown with milis. so that the led goes off after 60 seconds?

[@tythy-.-9914]

I have a question about the button pin? why the button Pin is 7? How to define which number of pin is for the button?

[@RoboticsBackEnd]

the button pin is 7 just because I decided to plug the wire from the button to the pin 7 on the circuit :) you could use any other valid pin, then make sure you use the same number in your code.

[@husseinali8412]

Nice video, good explenation but a bit slow. KEEP GOING!!! JUST DO IT ;)

[@bilalalissa6789]

Thank you Great video Very good explained.

[@Sam-ll4tl]

on your diagram resistor, it's seems 10k right ? not 100k on your video. its brown,black, yellow, gold

[@RoboticsBackEnd]

Yes it's 10k Ohm (4 band resistor) Note that for the real circuit I use a 5 band resistor, so the colors are a bit different (but still 10k)

[@Jannat_Rocks]

what are the 2 resistors used there which ohm ?

[@bloodlinks7137]

Read their color codes

[@stevewilson8267]

Great, hey thank you.

[@pablogutierrez4642]

what libraries do I need? it does not work... byte remains white

[@calebappiagyei4007]

Thanks very very much sir 🙏

[@ShoTime017]

TYSM!

[@spectrumtrend2328]

Thanks Man👌

[@mohamedahmedelsinety231]

Why is not working? int buttonPin=13; int buzzer=2; byte LastButtonState; byte BuzzerState=LOW; unsigned long lasttimebuttonstatechanged = millis(); unsigned long debounceduration = 50; void setup() { pinMode(buttonPin,INPUT); pinMode(buzzer,OUTPUT); LastButtonState= digitalRead(buttonPin); } void loop() { if (millis() - lasttimebuttonstatechanged >= debounceduration) { byte buttonstate =digitalRead(buttonPin); if (buttonstate != LastButtonState) { lasttimebuttonstatechanged = millis(); LastButtonState = buttonstate; if(buttonstate == LOW) { if (BuzzerState == HIGH) { BuzzerState = LOW ; } else { BuzzerState == HIGH; } digitalWrite(buzzer,BuzzerState); } } } }

[@mohamedahmedelsinety231]

I have known what is wrong the fking = after else just remove one

[@raypizer8037]

But why, if all you want to do is turn an led on and off, just use s power supply and switch

[@herschelvijae7201]

thnk you

[@tawfeqal-jaber5544]

thanks pro

[@technomattanbadbollisch1113]

Compilation error: expected '}' at end of input - Line 17 😩

[@RoboticsBackEnd]

That's a syntax error, triple check your code to find the error :)

[@nulzcage]

thank youu

[@LucasRizzotto]

lol your board is totally different from your cad

[@RoboticsBackEnd]

Just different colors, but the pin layout is the same.

[@imranfoodtech]

I am finding error collect2.exe

[@tahabelghalem447]

ty brother

[@Echelon_Sky_Denver]

First project followed to the 't,' but get "Compilation error: 'digitalRead' was not declared in this scope" Pretty dissapointing.

[@user-lo8td9uw4t]

This video is very useful. Thank you.