PWM control of haptic driver

[andrewggggggg]

I have a similar question.. I am trying to control four vibrating motors using a ProTrinket interfaced to four DRV2605s. My code below (critique welcome) sets up two input pins that read data from my trigger source, two PWM (9&10) output pins that go to the IN connector of different DRV2605s. Every millisecond, i check if the trigger arrives. If it does, i start the motor using analogWrite() and start a timer. When timer passes 500, which hopefully is 500ms, i turn the motor "off". My issue is that i cant figure out how to turn the motors off. I tried analogWrite(0), analogWrite(255), digitalWrite(LOW), digitalWrite(HIGH). I found through experimentation that 72 provided the least buzzy state. Help Appreciated!

These are the motors i am using.
https://www.amazon.com/gp/product/B00PZ ... UTF8&psc=1

Code: Select all

#include <Wire.h>
#include "Adafruit_DRV2605.h"
int inPin1 = 8;     // StimBox input 1
int inPin2 = 4;    // StimBox input 2
int outPin1 = 9;    //Pins 3,5,6,9,10,11 are PWM compatible with analogWrite().
//Pins 9 & 10 operate at high speed on Pro Trinket
int outPin2 = 10;
int inVal1 = 0;        // variable to store the read value
int inVal2 = 0;
int outVal1 = 0;
int outVal2 = 0;


Adafruit_DRV2605 drv;

void setup() {
  Serial.begin(9600);
  Serial.println("PWM test");
  drv.begin();
  drv.selectLibrary(7);

  // PWM Input
  drv.setMode(DRV2605_MODE_PWMANALOG);

  // ac coupled input, puts in 0.9V bias
  //drv.writeRegister8(DRV2605_REG_CONTROL1, 0x20);

  // analog input
  drv.writeRegister8(DRV2605_REG_CONTROL3, 0xA3);

  pinMode(inPin1, INPUT_PULLUP);        // sets the digital input pin (pullup means connect to ground)
  pinMode(inPin2, INPUT_PULLUP);
  pinMode(outPin1, OUTPUT);   // sets the pin as output
  pinMode(outPin2, OUTPUT);
  analogWrite(outPin1, 72);// 72  was the closest i could get to "off"
  analogWrite(outPin2, 72);
}

int timer1 = 0;
int timer2 = 0;
int starttimer1 = 0;
int starttimer2 = 0;

void loop() {

  inVal1 = digitalRead(inPin1);     // read the input pin
  inVal2 = digitalRead(inPin2);     

  if (inVal1 > 0 && starttimer1 == 0)
  {
    analogWrite(outPin1, 1);
    starttimer1 = 1;
    timer1 = 0;
    Serial.println("Start motor 1");
  }
  if (inVal2 > 0 && starttimer2 == 0)
  {
    analogWrite(outPin2, 1);
    starttimer2 = 1;
    timer2 = 0;
    Serial.println("Start motor 2");

  }

  //PWM for motor off is somewhere around 65-70;  There must be a better way to shut the motors off.

 if (starttimer1 == 1)
 {
  if (timer1 > 500)
  {
    analogWrite(outPin1, 72);
    //digitalWrite(outPin1, LOW); //Tried this and did not work
    starttimer1 = 0;  
    Serial.println("Stop motor 1");
  }
  timer1++;
}
if (starttimer2 == 1)
{
    if (timer2 > 500)
  {
   analogWrite(outPin2, 72);
   // digitalWrite(outPin2, HIGH);
    starttimer2 = 0;
    Serial.println("Stop motor 2");
  }  
    timer2++;
}
    delay(1);
}

[adafruit_support_carter]

Try wiring to I2C and see if you can get the demo sketch to work:
https://learn.adafruit.com/adafruit-drv ... g-and-test

[andrewggggggg]

I did initially start with the demo -- worked fine. I want to control four haptic drivers independently, based on inputs received by the Pro Trinket. I2C would not work for this, correct?

[adafruit_support_carter]

Unfortunately that device has only one I2C address. However, you can still use I2C if you use something like this:
https://learn.adafruit.com/adafruit-tca ... t/overview

[andrewggggggg]

Thanks for the suggestion! So, no way to turn motors off using PWM at the IN port of the DRV2605?

[adafruit_support_carter]

Kind of a chicken and egg thing. You can use it with a PWM input, but you need to configure it that way first over the I2C lines. So unfortunately you're still stuck with the I2C address conflict issue.