H Bridge Direction button

Projects Programming
1

Hello I have a simple h-bridge set up (attached) and here is the code I have so far.

int enablePin = 11;
int in1Pin = 10;
int in2Pin = 9;
int switchPin = 7;
int potPin = 0;

void setup()
{
pinMode(in1Pin, OUTPUT);
pinMode(in2Pin, OUTPUT);
pinMode(enablePin, OUTPUT);
pinMode(switchPin, INPUT_PULLUP);
}

void loop()
{
int speed = analogRead(potPin) / 4;
boolean reverse = digitalRead(switchPin);
setMotor(speed, reverse);
}

void setMotor(int speed, boolean reverse)
{
analogWrite(enablePin, speed);
digitalWrite(in1Pin, ! reverse);
digitalWrite(in2Pin, reverse);
}

Im using a reed switch as a push button but it only changes direction when its being held down. How can I make it switch direction permanently until its pushed again?

h bridge.png
h bridge.png800×781 725 KB

2 
boolean reverse, lastState; // set global, at top of code
.
.
.
//inside loop function
if(digitalRead(switchPin) == LOW && digitalRead(switchPin) != lastState) // looking to see if button state is LOW and does not equal the last state.
{ 
  reverse = !reverse; // will only change when button state is LOW
}

lastState = digitalRead(switchPin);

had to make slight edit.

3

Thank you but still no go.

boolean reverse, lastState; // set global, at top of code
int enablePin = 11;
int in1Pin = 10;
int in2Pin = 9;
int switchPin = 7;
int potPin = 0;
 
void setup()
{
  pinMode(in1Pin, OUTPUT);
  pinMode(in2Pin, OUTPUT);
  pinMode(enablePin, OUTPUT);
  pinMode(switchPin, INPUT_PULLUP);
}
 
void loop()
{
  int speed = analogRead(potPin) / 4;
  boolean reverse = digitalRead(switchPin);
  setMotor(speed, reverse);
 //-------------------------------------------------------------------------------------
  if(digitalRead(switchPin) == LOW && digitalRead(switchPin) != lastState) // looking to see if button state is LOW and does not equal the last state.
{ 
  reverse = !reverse; // will only change when button state is LOW
}

lastState = digitalRead(switchPin);
}
 //---------------------------------------------------------------------------------------
void setMotor(int speed, boolean reverse)
{
  analogWrite(enablePin, speed);
  digitalWrite(in1Pin, ! reverse);
  digitalWrite(in2Pin, reverse);
}
4

You still have "boolean reverse = digitalRead(switchPin);" in your code, which needs to be taken out and "setMotor(speed, reverse);" should be after the button check.

You also might want to give these an actual value. I didn't specify before, but they should be set.
"boolean reverse, lastState;"
Change them to these instead.

boolean reverse = false;
boolean lastState = false;
5

perfect thank you XD