I am using a Boron 404X with the Grove Particle Shield and a Grove - Variable Color LED v1.1 on digital pin 4. I have no idea why, but I can't get the LED to turn on with even the simplest of programs and nothing else attached.
Any suggestions?
How are you connecting it? The Grove Feather shield only supplies VCC at 3.3V, not 5V. It's a little unclear, but it looks like it's intended to be run at 5V.
However, for debugging purposes if you connect SIG to GND the LED should turn on. If it doesn't, there's a problem with the power, the LED, or the setting of the potentiometers.
This is the schematic of the board.
Do not power VCC at 5V and connect a Boron GPIO to SIG! Because there is a pull-up to VCC, if this is 5V you can damage the GPIO which are not 5V tolerant!
I power it by USB connected to my laptop as I upload and test programs. I also have a 3 x AAA battery holder, as I want my project to be mobile.
Is there any way to get the Grove LED light to work with my Boron and shield as I test different programs?