ky-040 for arduino arduino模块怎样接线

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int pinA = 3; // Connected to CLK on KY-040 CLK接 pin3 int pinB = 4; // Connected to DT on KY-040 DT接pin4 SW是按键，不用接。 int encoderPosCount = 0; int pinALast; int aVal; boolean bCW; void setup() { pinMode (pinA,INPUT); pinMode (pinB,INPUT); /* Read Pin A Whatever state it's in will reflect the last position */ pinALast = digitalRead(pinA); Serial.begin (9600); } void loop() { aVal = digitalRead(pinA); if (aVal != pinALast){ // Means the knob is rotating // if the knob is rotating, we need to determine direction // We do that by reading pin B. if (digitalRead(pinB) != aVal) { // Means pin A Changed first - We're Rotating Clockwise encoderPosCount ++; bCW = true; } else {// Otherwise B changed first and we're moving CCW bCW = false; encoderPosCount--; } Serial.print ("Rotated: "); if (bCW){ Serial.println ("clockwise"); }else{ Serial.println("counterclockwise"); } Serial.print("Encoder Position: "); Serial.println(encoderPosCount); } pinALast = aVal; }