digitalWrite(LEDPin, HIGH); 以pinMode()为例,这将使引脚 13 变为高电平或开启。同样,您可以通过将引脚设为低电平来关闭引脚。另一方面,您可以使用digitalRead()读取引脚的当前状态。为此,首先必须将模式设置为输入。int buttonPin = 3; int val; pinMode(buttonPin, INPUT); val = digitalRead(buttonPin); ...
(i, HIGH); // turn on pull-ups } } void loop() { Serial.write(HEADER); // send the header // put the bit values of the pins into an integer int values = 0; int bit = 0; for(int i=2; i <= 13; i++) { bitWrite(values, bit, digitalRead(i)); // set the bit to ...
When we set Arduino pin D2 high, the transistor activates and allows current to flow to the valve. Sketch // Arduino_Solenoid_Valve_01byte LED=13;byte Valve=2;voidsetup(){pinMode(LED,OUTPUT);pinMode(Valve,OUTPUT);}voidloop(){digitalWrite(LED,HIGH);digitalWrite(Valve,HIGH);delay(1000);d...
For timing critical applications the standarddigitalRead()anddigitalWrite()functions may be too slow. To solve this, MegaCoreX also incorporatesdigitalReadFast(myPin)anddigitalWriteFast(mypin, state)which compiles down to a single instruction.
digitalWrite(pin, HIGH);on an input pin has the same result. digitalRead(pin)returns the state of the input pin 1 = 5v, 0 = 0v. If you use a button with a pull-up resistor (e.g. the internal one), 1 means that the button is not pressed, 0 means it's pressed. ...
buttonState=digitalRead(BUTTON); // Print pushbutton state to serial monitor SerialUSB.println(buttonState); // Set the LED according to pushbutton state digitalWrite(LED,buttonState); // Set the builtin LED according to pushbutton state ...
By default upon boot, the pin is set to theINPUTmode. However, thisINPUTmode puts the pin into a high impedance state, which means that if there is no wire connected to the pin, the voltage on the pin is indeterminate. When the input pin is read (usingdigitalRead()), the boolean val...
int digitalRead(int pin) This reads the state of thepinnumber and returnsHIGHorLOW(both are integers). Analog I/O The analog I/O are related to pins A0 to A5 in the Intel Galileo headers, as explained in the section called “Arduino Headers on Intel Galileo” inChapter 1. Remember that...
digitalWrite(fog_light_high_beam, !digitalRead(fog_light_high_beam)); // shortcut to toggle the LED digitalWrite(fog_light_high_beam_indicator, !digitalRead(fog_light_high_beam_indicator)); // shortcut to toggle the LED }//if //if the value of "lightState" equals the value of "LIGHTS...
为了检测开关的状态 我们需要了解和学习一个新的 指令 函数 , Arduino : digitalRead() 。 函数会检查括号中指定的引脚上是否有电压信号 同时根据 digitalRead() , 检测结果返回HIGH 和LOW 。目前我们使用过的其他指令都没有返回任何信 息 它们只是执行我们 给它们的命令 不过这样的函数有一些局限 因为 , , , ...