WEMOS motor shield v 1.0 + Arduino UNO by I2C

Hi.

Somebody used the WEMOS library from
WEMOS_Motor_Shield_Arduino_Library
for communicating with Arduino UNO?

I'm attached WEMOS motor shield.
Upgrade with new firmware from here:
hackaday

Simple code easy to detected shield on address 0x30 but nothing happened when I'm trying to use the simple WEMOS library example code.

Like this:

#include "WEMOS_Motor.h"
int pwm;

//Motor shiled I2C Address: 0x30
//PWM frequency: 1000Hz(1kHz)

 Motor M1(0x30, _MOTOR_A, 1000); //Motor A

void setup() {
  Serial.begin(9600);
}

void loop() {

  for (pwm = 40; pwm <= 100; pwm++)
  {
    M1.setmotor( _CW, pwm);
//    sprintf( txt, "A:%d%, B:%d%, DIR:CW\r\n", pwm, 100 - pwm);
    Serial.println( txt );
    delay(500);
    M1.setmotor(_STANDBY);
    Serial.println("Motor A STANDBY");
    delay(100);
  }

It doesn't work.

Ok.
I'm found some idea.
In the code of class Motor using some code that can't be used before setup module in Arduino code :o
Solution is:

#include "WEMOS_Motor.h"
int pwm;

//Motor shiled I2C Address: 0x30
//PWM frequency: 1000Hz(1kHz)

Motor *M1;

void setup() {
  M1 = new Motor(0x30, _MOTOR_A, 1000); //Motor A
  Serial.begin(9600);
}

void loop() {

  for (pwm = 40; pwm <= 100; pwm++)
  {
    M1->setmotor( _CW, pwm);
//    sprintf( txt, "A:%d%, B:%d%, DIR:CW\r\n", pwm, 100 - pwm);
    Serial.println( txt );
    delay(500);
    M1->setmotor(_STANDBY);
    Serial.println("Motor A STANDBY");
    delay(100);
  }

But it doesn't work anyway >:(

I made the setup "log":

void setup() {
  M1 = new Motor(0x30, _MOTOR_A, 1000); //Motor A
  Serial.begin(9600);
  Serial.println("Let's start!");
}

Wtf!

Now it's work perfectly!!!

Without using Serial it works fine.
With "setup" using Serial.print function it works fine.

But what's wrong?
:blush:

What is wrong is you missed some vital posts one the way here..

Could you take a few moments to Learn How To Use The Forum.
Other general help and troubleshooting advice can be found here.
It will help you get the best out of the forum in the future.

Then you can post the code properly.