I have wired up an Arduino Mega to have two push buttons to rotate a stepper motor one revolution clockwise or counter clockwise depending on which button is pressed. The problem I am having is that the stepPin is sending a signal on startup of the Mega that is causing an initial revolution of the motor. When I unplug pin 4 and start it up, the motor will not turn. Do the digital pins on the Mega energize on startup or is it the program. I got the program off of Youtube. Thanks for looking at this.
// defines pins numbers
const int dirPin = 3;
const int stepPin = 4;
const int enPin = 5;
const int switchOne = 8;
const int switchTwo = 9;
int p1buttonState = 0; // current state of the button
int lastp1buttonState = 0; // previous state of the button
int p2buttonState = 0; // current state of the button
int lastp2buttonState = 0; // previous state of the button
bool bPress = false;
bool isForward = false;
bool isBackward = false;
void setup() {
Serial.begin(9600);
pinMode( switchOne, INPUT_PULLUP);
pinMode( switchTwo, INPUT_PULLUP);
// Sets the two pins as Outputs
pinMode(stepPin,OUTPUT);
pinMode(dirPin,OUTPUT);
pinMode(enPin,OUTPUT);
digitalWrite(enPin,LOW);
}
void loop() {
isForward = false;
isBackward = false;
p1buttonState = digitalRead(switchOne);
p2buttonState = digitalRead(switchTwo);
if (p1ButtonPress()) {
digitalWrite(dirPin,HIGH);
delay(5);
}
if (p2ButtonPress()) {
digitalWrite(dirPin,LOW);
delay(5);
}
if( isForward || isBackward ){
for(int x = 0; x < 800; x++) {
digitalWrite(stepPin,HIGH);
delayMicroseconds(500);
digitalWrite(stepPin,LOW);
delayMicroseconds(500);
}
}
}
bool p1ButtonPress()
{
bool isPress = false;
// compare the p1buttonState to its previous state
if (p1buttonState != lastp1buttonState) {
// if the state has changed, increment the counter
if (p1buttonState == LOW) {
// if the current state is HIGH then the button went from off to on:
bPress = true;
isPress = true;
Serial.println("Player One score");
} else {
// if the current state is LOW then the button went from on to off:
Serial.println("off");
isForward = true;
}
// Delay a little bit to avoid bouncing
delay(50);
}
// save the current state as the last state, for next time through the loop
lastp1buttonState = p1buttonState;
return isPress;
}
bool p2ButtonPress()
{
bool isPress = false;
// compare the p1buttonState to its previous state
if (p2buttonState != lastp2buttonState) {
// if the state has changed, increment the counter
if (p2buttonState == LOW) {
// if the current state is HIGH then the button went from off to on:
bPress = true;
isPress = true;
Serial.println("Player Two score");
} else {
// if the current state is LOW then the button went from on to off:
Serial.println("off");
isBackward = true;
}
// Delay a little bit to avoid bouncing
delay(50);
}
// save the current state as the last state, for next time through the loop
lastp2buttonState = p2buttonState;
return isPress;
}