Thanks for your help guys, I'll give this all a shot!

I'm trying to use M5Atom with any Grove sensor, and aren't making any progress.

An I2C scan finds one address in use (0x68). This is returned even when no sensors are plugged into the Grove port, and plugging in a sensor does not return any additional addresses.

1. What exactly is the device on 0x68?
2. Can the Grove port be used with I2C sensors? If so, how?

Thanks in advance for any help!

I used the M5Burner to upload UIFlow 1.2.2 to a grey M5Stack, and am able to write simple apps using http://flow.m5stack.com/
How do I go back to using Arduino - the M5Stack no longer shows as a serial port!