In this Arduino tutorial I will show you how to turn an LED on and off with a push button. In fact, we’ll do 2 slightly different applications.First, we will power on the LED when the button is pressed, and power off the LED when the button is not pressed....
// check if the pushbutton is pressed.// if it is, the buttonState is HIGH:if (buttonState == HIGH) { // turn LED on:digitalWrite(ledPin, HIGH);} else { // turn LED off:digitalWrite(ledPin, LOW);} 说明：L01〜L02：定义按键与LED的脚位，按键接在PIN2码，而LED...
voidloop(){ /* read the state of the pushbutton value:*/ buttonState = digitalRead(buttonPin); /* check if the pushbutton is pressed. If it is, the buttonState is HIGH:*/ if(buttonState == HIGH) { /* turn LED on:*/ digitalWrite(ledPin, HIGH); }else{ /* turn LED off:*/ ...
Make sure to power off the Arduino. Plug the push button in the middle of the breadboard, like on the picture. On one button’s leg, plug a wire (black if possible) to a GND pin on the Arduino board. The top left and bottom left legs of the button are connected together, and the...
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/*Button Turns on and off a light emitting diode(LED) connected to digital pin 13, when pressing a pushbutton attached to pin 2. The circuit: * LED attached from pin 13 to ground * pushbutton attached to pin 2 from +5V * 10K resistor attached to pin 2 from ground ...
This example shows how to detect when a button or button changes from off to on and on to off. 本示例说明如何检测按钮或按钮从关闭变为打开,然后从打开变为关闭。 The circuit: * pushbutton attached to pin 2 from +5V * 10K resistor attached to pin 2 from ground ...
// check if the pushbutton is pressed. If it is, the buttonState is HIGH: if (buttonState == HIGH) { // turn LED on: digitalWrite(ledPin, HIGH); } else { // turn LED off: digitalWrite(ledPin, LOW); } } 代码的工作原理 ...
我们打算是IO15是按键,IO2是板载LED灯。 所以修改。 注意如何设置输入输出模式,OUTPUT和INPUT。 如何读取某个管脚的电平状态。 /* Button Turns on and off a light emitting diode(LED) connected to digital pin 13, when pressing a pushbutton attached to pin 2. ...
INPUT);}voidloop(){// read the state of the pushbutton value:buttonState=digitalRead(buttonPin);// check if the pushbutton is pressed. If it is, the buttonState is HIGH:if(buttonState==HIGH){// turn LED on:digitalWrite(ledPin,HIGH);}else{// turn LED off:digitalWrite(ledPin,LOW);...