#include <Stepper.h>
const int analogPin = A0;
const int stepsPerRevolution = 200*4;
Stepper myStepper(stepsPerRevolution, 8, 7);
void setup() {
myStepper.setSpeed(60);
Serial.begin(9600);
}
void loop() {
int analogVal = analogRead(analogPin);
if (analogVal > 430) { // 2.1V
myStepper.step(stepsPerRevolution);
} else if (analogVal < 390) { // 1.9V
myStepper.step(-stepsPerRevolution);
}
}