M5stack Core and GoPlus Module dc motor connector adresses missing (Arduino)

[WBE]

Hello. I'm trying to configure my GoPlus module using the example codes which are very limited on the M5 documentation for GoPlus. I can't find the correct list of addresses to be used anywhere.

I want to power my DC 3-6V gearmotors 1:120 using the code adding an extra 5V external powersupply (max 2A) through the XT30 connector.
I found the max speed in example codes is 250 and min is -250 for the motor command but with other values in between this gives the same issue.
So the code I used is following:
void Motor(void){
Serial.println("-------------------------MOTOR Sturing -------------");
Serial.println(" motorspeed 200");

 M5.Lcd.setCursor(40, 60, 2);
 M5.Lcd.setTextColor(TFT_WHITE, TFT_BLACK);
  M5.Lcd.printf("Test MoTor motorspeed 250      \n "); 
goPlus.Motor_write_speed(MOTOR_NUM0, (uint8_t)0x80, 250);
goPlus.Motor_write_speed(MOTOR_NUM1, (uint8_t)0x00, 250);
delay(5000);

Serial.println(" motorspeed 0");
 M5.Lcd.setCursor(40, 60, 2);
 M5.Lcd.setTextColor(TFT_WHITE, TFT_BLACK);
  M5.Lcd.printf("Test MoTor motorspeed 0      \n "); 
 goPlus.Motor_write_speed(MOTOR_NUM0, (uint8_t)0x80, 0);
 goPlus.Motor_write_speed(MOTOR_NUM1, (uint8_t)0x00, 0);
delay(500);

Serial.println(" motorspeed -250");
 M5.Lcd.setCursor(40, 60, 2);
 M5.Lcd.setTextColor(TFT_WHITE, TFT_BLACK);
  M5.Lcd.printf("Test MoTor motorspeed -250     \n "); 
 goPlus.Motor_write_speed(MOTOR_NUM0, (uint8_t)0x00, -250);
 goPlus.Motor_write_speed(MOTOR_NUM1, (uint8_t)0x00, -250);
    delay(5000);
Serial.println(" motorspeed 0");
 M5.Lcd.setCursor(40, 60, 2);
 M5.Lcd.setTextColor(TFT_WHITE, TFT_BLACK);
  M5.Lcd.printf("Test MoTor motorspeed 0\n "); 
goPlus.Motor_write_speed(MOTOR_NUM0, (uint8_t)0x80, 0);
goPlus.Motor_write_speed(MOTOR_NUM1, (uint8_t)0x00, 0);
delay(500);

}

It just doesn't seem to be able to power the DC connectors. I get a -0.2V max out and a + 0,8V max which isn't enough to run the motor.

Has anyone experience or documentation what adresses of code instructions are to be used to fix this issue?
Or a link with the more complete documentation what commands and adresses to use for steering the servo and DC motor pins?

Because I'm really blocked for weeks now.
Thanks upfront.
Wim

[felmue]

Hello @WBE

Note: I don't own the GoPlus module so my conclusions could be incorrect.

The DCDC step-down converter (TPS54360) is, according to the schematic, setup to output 6.5 V. Normally step-down converter require a slightly higher input voltage than the output voltage to function properly. Also according to the GoPlus description the DC input range is 6.5 V - 24 V. So assuming nothing is wrong with your code (which I cannot say w/o testing, sorry) I have a feeling that 5 V at the DC input might be too low.

BTW: have you tried to use UIFlow - might be helpful to verify whether your hardware setup is correct?

Thanks
Felix

[WBE]

@felmue Thanks for the fast response. I missed the 6,5V minimum input. I initially changed the power supply of 12V 500mA to a 5v 2A because I thought the power consumption would be bigger than 0.5A. I tested again and it doesn't seem to work.
I found a chinese doc on the GoPlus that contained another example after translation (thanks Deepl):
uint16_t speed = 200;
Wire.beginTransmission(0x5d); // adress GoPlus
Wire.write(0x30); //motor connection
Wire.write((speed >> 8)&0x80); // port 1 DC and 0x00 = port 2 DC
Wire.write(speed & 0xff); // no idea where 0xff comes from
Wire.endTransmission();

fingers crossed this will work. I have no way to test whether the GoPlus became defunct. The Servo steering doesn't work either. Maybe I need also a bigger power supply...
Starting to think buying the GoPlus a while ago wasn't the best idea...

[WBE]

This post is deleted!

[ajb2k3]

In my railway project I use 12V in but only get 5V out max

0xff stops the motors.

Wire.write((speed >> 8)&0x80);

Needs to be

Wire.write((speed >> 8)&0x00);

for the second channel.