旋转编码器从外观上来看很接近旋转电位器，但是旋转编码器没有终点，随便转多少圈。 我是淘宝上随便买了一个，一共5个端子，其中2个是电源，1个是按压开关，按下的状态为LOW，剩余两个端子是比较时序使用的。 网上找来的例程是给arduino uno使用的，移植到nodeMCU上需要略做改动。 一、重新定义接入针脚，两个测时序的端子分别接D1和D2，按钮端子接D0 二、重新绑定中断attachInterrupt(4, updateEncoder, CHANGE)，当电平改变时触发中断 三、ICACHE_RAM_ATTR void updateEncoder()，定义中断后所执行的函数时，要加上ICACHE_RAM_ATTR
int encoderPinA = 5; int encoderPinB = 4; int buttonPin = 16; volatile int lastEncoded = 0; volatile long encoderValue = 0; long lastencoderValue = 0; int lastMSB = 0; int lastLSB = 0; long readEncoderValue(void) { return encoderValue / 4; } boolean isButtonPushDown(void) { if (!digitalRead(buttonPin)) { delay(5); if (!digitalRead(buttonPin)) return true; } return false; } void setup() { Serial.begin (9600); pinMode(encoderPinA, INPUT); pinMode(encoderPinB, INPUT); pinMode(buttonPin, INPUT); digitalWrite(encoderPinA, HIGH); //turn pullup resistor on digitalWrite(encoderPinB, HIGH); //turn pullup resistor on //call updateEncoder() when any high/low changed seen //on interrupt 0 (pin 2), or interrupt 1 (pin 3) attachInterrupt(5, updateEncoder, CHANGE); attachInterrupt(4, updateEncoder, CHANGE); } void loop() { //Do stuff here if (isButtonPushDown()) { Serial.println("you push button down!!!"); } Serial.println(readEncoderValue()); delay(50); //just here to slow down the output, and show it will work even during a delay } ICACHE_RAM_ATTR void updateEncoder() { int MSB = digitalRead(encoderPinA); //MSB = most significant bit int LSB = digitalRead(encoderPinB); //LSB = least significant bit int encoded = (MSB << 1) | LSB; //converting the 2 pin value to single number int sum = (lastEncoded << 2) | encoded; //adding it to the previous encoded value if (sum == 0b1101 || sum == 0b0100 || sum == 0b0010 || sum == 0b1011) encoderValue ++; if (sum == 0b1110 || sum == 0b0111 || sum == 0b0001 || sum == 0b1000) encoderValue --; lastEncoded = encoded; //store this value for next time }