Step motor problems when trying to use A4 and A5 for step and direction control

Troubleshooting
1

Hello, I have a system with multiple sensors and step motors. The data sheet says that A4 and A5 have PWM signal. When I hook up my step motor to them through a driver A5642 to direction and step pins the step motor do not work it only works on D0 and D1. Does anyone know what can I do to turn PWM on A4 or A5.
Thank you

2

Just for the records: Is this a Photon?
Would be good to state that in the OP :wink:

And it would help to see your code too.

Why do you need PWM for the direction pin?

Have you got a link to the driver’s datasheet? Google seems to know as little about that driver as I do :sunglasses:

1 Like
3


Is the motor driver.
I need PWM only for stepping and i am using photon. thank you
Code:

// This #include statement was automatically added by the Particle IDE.
#include <SHT1x.h>
#define dataPin D0
#define clockPin D1
int relayMotor1  = D6; // used by particle relay shield
int relayMotor2  = D5;
int relayHeater1 = D4;
int relayHeater2 = D3;
int Dir1         = D7;
int Step1        = D2;
int Dir2         = A6;
int Step2        = A5;
int relayPump    = A7;
int relayFan =    A0;
int motor1up =    A1;
int PWM = 0;
int motor1down =  A2;
int motor2up   =  A3;
int motor2down =  A4;
int Distance = 0;
SHT1x sht1x(dataPin, clockPin);


void setup() {
pinMode(A5,OUTPUT);
pinMode(D6,OUTPUT);
pinMode(D5,OUTPUT);    
pinMode(D4,OUTPUT);
pinMode(D3,OUTPUT);
pinMode(D2,OUTPUT);
pinMode(D7,OUTPUT);
//pinMode(D1,OUTPUT);    
//pinMode(D0,OUTPUT);
pinMode(A0,OUTPUT);
pinMode(A1,OUTPUT);
pinMode(A2,OUTPUT);    
pinMode(A3,OUTPUT);
pinMode(A4,OUTPUT);
//analogWrite(A5,LOW);
digitalWrite(A5,LOW);
digitalWrite(D6,LOW);
digitalWrite(D5,LOW);
digitalWrite(D4,LOW);
digitalWrite(D3,LOW);
digitalWrite(A4,LOW);
digitalWrite(D1,LOW);
digitalWrite(D0,LOW);
digitalWrite(A0,LOW);
digitalWrite(A1,LOW);
digitalWrite(A2,LOW);
digitalWrite(A3,LOW);
analogWrite(A5,LOW);
digitalWrite(A4,LOW);
2^(analogWriteResolution(A5))-1;
analogWriteMaxFrequency(A5);
}

void ventClose(){
    delay(1);
    Particle.publish("close","close");
    digitalWrite(Dir1,HIGH);
    digitalWrite(relayMotor1,HIGH);
    digitalWrite(Step1,1) ;
 delay(1);
digitalWrite(Step1,0);
 delay(1);
  Distance = Distance + 1;
 delay(1);

 if ( digitalRead(motor1up) == HIGH){
     delay(1);
    digitalWrite(relayMotor1,LOW);
 }
  if (Distance ==2000){
   while (true)
{ 
    delay(1);
    digitalWrite(relayMotor1,LOW);
   delay(10);
    Distance = 0;
    return;
}}}
void ventOpen(){
       delay(1);
       Particle.publish("open", "open");
       delay(1);
       digitalWrite(Dir1,LOW);
    digitalWrite(relayMotor1,HIGH);
    digitalWrite(Step1,1) ;
 delay(1);
digitalWrite(Step1,0);
 delay(1);
  Distance = Distance + 1;
 delay(1);
//if ( digitalRead(SWITCH) == HIGH){
    // delay(1);
   // digitalWrite(D6,LOW);
// }
  if (Distance ==2000 ){
   while (true)
{ ;
    delay(1);
    digitalWrite(relayMotor1,LOW);
   delay(10);
    Distance = 0;
    return;
}}}

void loop() {

float temp_c;
  float temp_f;
  float humidity;
 
  // Read values from the sensor
  temp_c = sht1x.readTemperatureC();
  temp_f = sht1x.readTemperatureF();
  humidity = sht1x.readHumidity();
 
  // Print the values to the serial port
  Serial.print("Temperature: ");
  Serial.print(temp_c, DEC);
  Serial.print("C / ");
  Serial.print(temp_f, DEC);
  Serial.print("F. Humidity: ");
  Serial.print(humidity);
  Serial.println("%");
  
  Particle.publish("Celsius", String(temp_c));
  Particle.publish("Humidity", String(humidity));
  Particle.publish("Fahrenheit", String(temp_f));
  if (temp_f <=79  && digitalRead(Dir1)== LOW){
      delay(1000);
      ventClose();
      delay(1000);
      digitalWrite(relayHeater1, HIGH);
      delay(1000);
      digitalWrite(relayHeater2, HIGH);
      delay(1000);
      digitalWrite(relayPump, HIGH);
      delay(1);
      digitalWrite(relayFan,LOW);
      
  }

  if (temp_f >=80  && digitalRead(Dir1) == HIGH){
      delay(1000);
      ventOpen();
      delay(1000);
      digitalWrite(relayFan,HIGH);
      delay(1);
      digitalWrite(relayHeater1, LOW);
      delay(1000);
      digitalWrite(relayHeater2, LOW);
      delay(1000);
      digitalWrite(relayPump, LOW);
      delay(1000);
  }
  delay(2000);
}
4

I see, this is a motor driver I actually do know - reading this I'd never had guessed :wink:

Not sure what these lines are supposed to do :confused:

I know what the commands do, but they are not usually used that way.

This also seems confusing

Why an indefinet while() which will always finish on first iteration?

I can also not see any real PWM use on A4 or A5 - so I'm utterly confused about this code.

BTW, proper code indentation makes it also easier to follow the code.

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