I just got the SEEED STUDIO XIAO SAMD21 boards. I can control the built in led so i assume Im uploading code correctly. however, no matter what code i upload i cant get any input or output from it. The power and ground pins are working but nothing from the controlled pins.
Update: There is no resistor on the led. the ground and 3V3 pins work. nothing i write to the board does anything for the programmable pins.
Please post your formatted code in a code block.
What is connected to the pins? A schematic would likely be helpful.
The board is connected to the USB on my pc. An led is connected to ground and pin 9 on the board. the led worked when connected directly to the 3v pin but not to a controlled pin. The code is just writing pin 9 high. it worked on an Arduino uno board.
Are you sure of the polarity of the LED?
Input pinMode to OUTPUT?
I tried both ways to double check and still nothing. Yes the pin mode is set to output.
Current limiting resistor in place?
Not that i know of. the led is connected directly to the pins.
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