Eckstein komponente KS0530 - Page 100

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(5)Test Code：read the signal of the push button module
/*
keyestudio sun_follower
lesson 3.1
button
http://www.keyestudio.com
*/
#define button 2 //define the pin of the push button module as D2
volatile int buttonState; //the state of the level output by the push
button module
void setup()
{