I'm having trouble completing Project 10: Zoetrope. I followed the build instructions and used the provided code. The motor does not move.
I added print statements to the code to check that the input and output are as expected.
I also checked the voltage to the input pins of the H-Bridge and they are as expected. I checked that Pin 1 on H-Bridge receives 0V before I click the first switch and a variable voltage (changed from the potentiometer) after I click the first switch. I also checked that Pins 2 and 7 receive high (5V) and low voltages and they swap when I click the second switch. I also checked that 9V go into Pin 8.
I can only detect 0V on the output pins of the H-Bridge. I verified that the motor is functional by connecting it directly to power.
It looks like the only thing left to check is the H-Bridge. How can I confirm that it is working as expected? Do you see anything wrong with my setup? Is there anything else I can try?
Here is a photo of the circuit. The middle pin of the potentiometer is connected from the right side of the breadboard to the left side by a small jumper under the potentiometer.
Here is the code with my print statements.
const int controlPin1 = 2; // connected to pin 7 on the H-bridge
const int controlPin2 = 3; // connected to pin 2 on the H-bridge
const int enablePin = 9; // connected to pin 1 on the H-bridge
const int directionSwitchPin = 4; // connected to the switch for direction
const int onOffSwitchStateSwitchPin = 5; // connected to the switch for turning the motor on and off
const int potPin = A0; // connected to the potentiometer's output
// create some variables to hold values from your inputs
int onOffSwitchState = 0; // current state of the on/off switch
int previousOnOffSwitchState = 0; // previous position of the on/off switch
int directionSwitchState = 0; // current state of the direction switch
int previousDirectionSwitchState = 0; // previous state of the direction switch
int motorEnabled = 0; // Turns the motor on/off
int motorSpeed = 0; // speed of the motor
int motorDirection = 1; // current direction of the motor
void setup() {
// initialize the inputs and outputs
pinMode(directionSwitchPin, INPUT);
pinMode(onOffSwitchStateSwitchPin, INPUT);
pinMode(controlPin1, OUTPUT);
pinMode(controlPin2, OUTPUT);
pinMode(enablePin, OUTPUT);
// pull the enable pin LOW to start
digitalWrite(enablePin, LOW);
Serial.begin(9600);
}
void loop() {
// read the value of the on/off switch
onOffSwitchState = digitalRead(onOffSwitchStateSwitchPin);
delay(1);
// read the value of the direction switch
directionSwitchState = digitalRead(directionSwitchPin);
// read the value of the pot and divide by 4 to get a value that can be
// used for PWM
motorSpeed = analogRead(potPin) / 4;
Serial.print("onOFF: (");
Serial.print(previousOnOffSwitchState);
Serial.print(") ");
Serial.print(onOffSwitchState);
Serial.print("\t direction: (");
Serial.print(previousDirectionSwitchState);
Serial.print(") ");
Serial.print(directionSwitchState);
Serial.print("\t speed: ");
Serial.print(motorSpeed);
Serial.print("\t enabled: ");
Serial.print(motorEnabled);
// if the on/off button changed state since the last loop()
if (onOffSwitchState != previousOnOffSwitchState) {
// change the value of motorEnabled if pressed
if (onOffSwitchState == HIGH) {
motorEnabled = !motorEnabled;
}
}
// if the direction button changed state since the last loop()
if (directionSwitchState != previousDirectionSwitchState) {
// change the value of motorDirection if pressed
if (directionSwitchState == HIGH) {
motorDirection = !motorDirection;
}
}
// change the direction the motor spins by talking to the control pins
// on the H-Bridge
if (motorDirection == 1) {
Serial.print("\t1 HIGH\t2 LOW\tmotor: ");
digitalWrite(controlPin1, HIGH);
digitalWrite(controlPin2, LOW);
} else {
Serial.print("\t1 LOW\t2 HIGH\tmotor: ");
digitalWrite(controlPin1, LOW);
digitalWrite(controlPin2, HIGH);
}
// if the motor is supposed to be on
if (motorEnabled == 1) {
Serial.println(motorSpeed);
// PWM the enable pin to vary the speed
analogWrite(enablePin, motorSpeed);
} else { // if the motor is not supposed to be on
Serial.println("0");
//turn the motor off
analogWrite(enablePin, 0);
}
// save the current on/off switch state as the previous
previousDirectionSwitchState = directionSwitchState;
// save the current switch state as the previous
previousOnOffSwitchState = onOffSwitchState;
}
Here is some the output produced when I click the switches, the number in the parenthesis is the previous value:
12:03:28.230 -> onOFF: (0) 0 direction: (0) 0 speed: 108 enabled: 0 1 LOW 2 HIGH motor: 0
12:03:28.329 -> onOFF: (0) 0 direction: (0) 0 speed: 108 enabled: 0 1 LOW 2 HIGH motor: 0
12:03:28.396 -> onOFF: (0) 1 direction: (0) 0 speed: 108 enabled: 0 1 LOW 2 HIGH motor: 108
12:03:28.495 -> onOFF: (1) 1 direction: (0) 0 speed: 108 enabled: 1 1 LOW 2 HIGH motor: 108
12:03:29.657 -> onOFF: (0) 0 direction: (0) 1 speed: 108 enabled: 1 1 HIGH 2 LOW motor: 108
12:03:29.724 -> onOFF: (0) 0 direction: (1) 1 speed: 108 enabled: 1 1 HIGH 2 LOW motor: 108
12:03:33.575 -> onOFF: (0) 1 direction: (0) 0 speed: 108 enabled: 1 1 LOW 2 HIGH motor: 0
12:03:33.641 -> onOFF: (1) 1 direction: (0) 0 speed: 108 enabled: 0 1 LOW 2 HIGH motor: 0