How To Use Button To Start/stop The Loop | Arduino FAQs

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Home FAQs How to use button to start/stop the loop

How can I start the loop if a button is pressed, stop the loop if the button is pressed again in Arduino? This process is repeated forever.

Answer

Let's see and compare the code WITHOUT and WITH the start/stop button.

Arduino Code WITHOUT the Start/Stop Button.

void setup() { /******************* * your setup code *******************/ } void loop() { /****************** * your loop code ******************/ }

Arduino Code WITH the Start/Stop Button.

#include <ezButton.h> #define LOOP_STATE_STOPPED 0 #define LOOP_STATE_STARTED 1 ezButton button(7); // create ezButton object that attach to pin 7; int loopState = LOOP_STATE_STOPPED; void setup() { /******************* * your setup code *******************/ button.setDebounceTime(50); // set debounce time to 50 milliseconds } void loop() { button.loop(); // MUST call the loop() function first if (button.isPressed()) { if (loopState == LOOP_STATE_STOPPED) loopState = LOOP_STATE_STARTED; else // if(loopState == LOOP_STATE_STARTED) loopState = LOOP_STATE_STOPPED; } if (loopState == LOOP_STATE_STARTED) { /****************** * your loop code ******************/ } }

The wiring diagram for above code:

This image is created using Fritzing. Click to enlarge image

If you want to use a button to start the program only when the button is pressed the first time, see Arduino - using a button to start the program

※ NOTE THAT:

In this case, we SHOULD debounce the button. If not, the code may not work as expected.
The above code uses the ezButton library, you can see how to install the library

Hardware for above code

1 × Arduino UNO Buy on Amazon

1 × USB 2.0 cable type A/B Buy on Amazon

1 × Button Buy on Amazon

1 × Breadboard Buy on Amazon

1 × Jumper Wires Buy on Amazon

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How To Use Button To Start/stop The Loop | Arduino FAQs

Arduino Code WITHOUT the Start/Stop Button.

Arduino Code WITH the Start/Stop Button.

The wiring diagram for above code:

Hardware for above code

The Best Arduino Starter Kit

See Also

Pause Code Untill A Button Is Pressed - Arduino Stack Exchange

How To Pause And Continue A Loop With A Button Press?

Pause Code Until Button Is Pressed. - Arduino Forum

Pause Program Mid Loop Until Switch Is Pressed? - Arduino Forum

How To Pause Code Until A Button Is Pressed (Arduino Uno ... - Quora

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[Arduino] ButtonWait - Wait For Button Press Before Further Execution.

Wait For A Button Press, Then Continue : R/arduino - Reddit

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Pausing A Arduino Shetch, And Wait For A Button Press - EEVblog

Tutorial_pushbutton_debounce_i...

Detecting Other Conditions - Code: Robotics

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