// // step 6 to 12 vdc motor speed up and down // int motorpin3 = 3; // TIP120 transistor base connected to pwm pin 3 via 1k ohm resistor int time = 1000; // time between motor speed increment steps void setup() { // nothing for setup } void loop() { analogWrite(motorpin3, 125); delay(time); analogWrite(motorpin3, 150); delay(time); analogWrite(motorpin3, 175); delay(time); analogWrite(motorpin3, 200); delay(time); analogWrite(motorpin3, 225); delay(time); analogWrite(motorpin3, 255); delay(time); analogWrite(motorpin3, 225); delay(time); analogWrite(motorpin3, 200); delay(time); analogWrite(motorpin3, 175); delay(time); analogWrite(motorpin3, 150); delay(time); analogWrite(motorpin3, 125); delay(time); }