Qik 2s9v1 Problem

Support Motor controllers/drivers and motors
1

I am using a qik 2s9v1 motor controller to drive 4 polulu micro gear motors. the motors are wired as 2 pairs, one pair per channel.
I am using an arduino duelmilanove controller. The error light comes on and the motors stop when the motors are instructed to change direction. I have been unable to get the error code so far.

this generally causes a failure. i do set the motors to coast briefly between transitions. It seems to work reasonably well on USB power, but when using the 7.4 180 mah 20c lipo battery it fails often

any ideas would be appreciated.

#include <SoftwareSerial.h>

#define rxPin 4
#define txPin 6
#define reset 5

SoftwareSerial mySerial =  SoftwareSerial(rxPin, txPin);

void setup()  {
  
  pinMode(rxPin, INPUT);
  pinMode(txPin, OUTPUT);
  pinMode(reset,OUTPUT);
  
  mySerial.begin(9600); // set the data rate for the SoftwareSerial port

  digitalWrite(reset, LOW);
  delay(100);
  digitalWrite(reset, HIGH);
  delay(10);

  mySerial.write(0xAA);


  delay(100);

}

void loop(){ 
  mySerial.write(0x88);    //M0 forward
  mySerial.write(0x7F);  //M0 speed 

  mySerial.write(0x8C);  //M1 forward
  mySerial.write(0x7F);  //M1 speed
  
  delay(2000);
  
  mySerial.write(0x86);
  mySerial.write(0x87);
  delay(200);
  
  mySerial.write(0x8A);  //M0 forward
  mySerial.write(0x7F);  //M0 speed 

  mySerial.write(0x8E);  //M1 forward
  mySerial.write(0x7F);  //M1 speed
  delay(2000);
  
  mySerial.write(0x86);
  mySerial.write(0x87);
  delay(200);
  
  
  
}
2

Hi,

What kind of motors do you have? What is the motor stall current? Is your battery fully charged? Do you have an oscilloscope you can use to look at the battery voltage while it is happening?

- Ryan