Tony

you are correct, the RGB LED is connected to GPIO2.

Here is a blinking RGB LED example for Arduino.

And here is an example using the RGB LED for ESP-IDF.

Thanks
Felix

What Pin did you assign to the LED? The examples have 21, but I think it's 2. I can compile code , but can't get the LED to flash. I can do a WIFI scan, so know the toolchain is working

Thanks

Tony

Thanks for all your help, felmue. I wouldn't have been able to get this working without you. :)

Cheers

NM

I think that is normal for the StampC3U. 'U' stands for the internal USB (in contrast to an external USB Serial converter) and in order to get debug output some flags need to be defined. See here and here. Edif: Unfortunately by default these flags are undefined in the ESP32-Arduino libraries. Looking through sdkconfig.h in github it looks like the necessary flag #define CONFIG_ESP_CONSOLE_SECONDARY_USB_SERIAL_JTAG 1 is set in Arduino 2.0.2 and up. Not sure why it is not working though.

Thanks
Felix

thanks for the advice. Doing it your way is working now. I am able to upload.

Can you tell me, what are the differences working with Serial on the STAMP C3U from other microcontrollers.

I have used this code to set up the Serial port so i can get info to my Serial Monitor but it isn't working. I am running a simple Blink test sketch in the Arduino IDE and the LED i attached is blinking so i know the sketch uploaded and is working fine, but i am getting no text showing up in the Serial Monitor...

Serial.begin(115200);
delay(1000);
Serial.println("==========");
Serial.println("BASIC TEST");
Serial.println("==========");

...that code is in the setup function. I have the "Upload Speed" setting in the Arduino IDE set to 115,200 and the Serial Monitor is also set to 115,200 but nothing shows up on the Serial Monitor.

Thanks

NM

maybe below instructions from the documentation can help:

Program Download/Notes
Enter the program download mode operation:

1. Long press the center button (G9) of STAMP C3U under power failure condition.
2. Connect to the computer, after the port is successfully identified, program burning.

what that means is:

1. disconnect (= power failure condition) M5StampC3U from the USB port
2. press and hold (= long press) the center button
3. while holding the center button, connect M5StampC3U to USB

Now M5StampC3U should be in download mode.

Alternative method: Or what I use (with USB connected all the time):

1. press and hold the center button
2. while holding the center button, click the reset button (small one)
3. then release center button

Thanks
Felix