If you have a robot, use for example, the following code while driving:

leftMotor.setmotor(_CCW, 0); rightMotor.setmotor(_CCW, 0);
The robot will turn the left wheel off first, then delay, and then the right wheel, causing the robot to turn 10-20 degrees left.

This is caused by

Sorry to use GitHub to make contact, however I think you should know that your AliExpress store is still saying "Company Holiday until January 30th" - today is the 5th February. When will the store be open again? Feel free to delete or close this issue.

First the code didn't build until I included Wire.h then I couldn't get the code to run on my wemos d1, It simply restarted again and again showing rst cause:2, boot mode:(3,7)

First after I added wire.h and changed the code to use pointers and called the Motor constructor from setup(), it worked.

include <Wire.h>

...

Motor *M1 = NULL;
Motor *M2 = NULL;

void setup() {
delay(1000);
Serial.begin(115200);
M1 = new Motor(0x30,_MOTOR_A, 1000);//Motor A
M2 = new Motor(0x30,_MOTOR_B, 1000);//Motor B
}

void loop() {

for (pwm = 0; pwm <= 100; pwm++)
{
M1->setmotor( _CW, pwm);

...etc..

Hopefully it helps someone.

I'd like to run a 2 phase stepper motor off the shield- is it possible to add this functionality to the code flashed on the chip for i2c control?

The TB6612 chip listed on the schematic and in the comments is just a motor driver chip. There is a second chip on this board, providing the I²C communications and PWM generation -- however, it's unlabeled on the schematic.

I'm trying to write a library for interfacing with this shield for the MicroPython on ESP8266, and it would be a great help if you could tell me what the chip is, so that I can check its datasheet for details (I don't want to just blindly copy from the Arduino library, but if anything else fails, I will have to do it).

I have ordered this shield, and I could just wait for it to arrive and then check the markings on the chip, but it takes a long time to arrive, and I thought that I could start writing the library for it already.

Thank you for the great board and great shields!