I will be using the "stick" in teaching environments over the next year so I have started compiling notes on how well it works with various hardware add-ons. At the moment I have a starter list posted at: http://tinkerfarm.net/projects/the-m5stickc/m5stickc-hardware-accessories/.
I will be adding to that page as I get deeper into it, next up will be some of the commodity sensors that people use with Arduinos, since my site is aimed at beginners. I hope this might be helpful to some of the people on this forum.

I have posted my notes on using the stick with some Grove modules (over the grove connector) here: http://tinkerfarm.net/projects/the-m5stickc/m5stickc-hardware-accessories/

I am wondering if the "M5" functions/commands have a reference document somewhere. I am using the M5StickC under Arduino IDE. Of course there are many applied examples in the example programs. But it would be very helpful to find a more comprehensive reference to them, even if someone can just point me to the right library file where they are all defined in code. Thanks.

@ajb2k3 That group was actually part of an order of 20. I am using them to teach a series of workshops called "Beyond the Arduino" http://tinkerfarm.net/workshops/m5stickc-workshop-2019/.
The idea is that you can learn basic Arduino using the sticks but then you can go much farther with the extra on board hardware or expansion via the grove port or header pins. Just finished the first one and I have learned getting people comfortable with the setup process--how to expand the Arduino IDE past the built in boards and libraries by itself expands their horizons on what is possible with micro controller platforms.

What is the Hall sensor actually measuring in that example? I dont see any evidence of a changing external magnetic field. Also I wonder if it's a problem that there is also a magnet in the M5StickC case.

@brain-brawn Have you tried installing the FTDI drivers (https://www.ftdichip.com/FTDrivers.htm)? I have found that this solved USB connection problems with obsolete versions of Windows in a couple cases.

@ajb2k3 Until Espressif changes their datasheet on the ESP32 this is officially not a 5V tolerant device. Many devices will work with it, but I will continue to test each one before telling people it is OK.

@shintobi no I don't

Have you considered using Bluetooth? I have connected a single Bluetooth tracking device (not from M5) to Unity without too much trouble. I believe Bluetooth supports up 7 clients connected at once.

@cepics said in M5stickC and VL53L1X sensor GROVE port:

VL53L1X

I tried the VL53L0X unit on the grove port of the stick several times and could not get it to work. I know that really doesn't really help you but at least your are not alone in this quest :)

@ajb2k3 That group was actually part of an order of 20. I am using them to teach a series of workshops called "Beyond the Arduino" http://tinkerfarm.net/workshops/m5stickc-workshop-2019/.
The idea is that you can learn basic Arduino using the sticks but then you can go much farther with the extra on board hardware or expansion via the grove port or header pins. Just finished the first one and I have learned getting people comfortable with the setup process--how to expand the Arduino IDE past the built in boards and libraries by itself expands their horizons on what is possible with micro controller platforms.

Maybe you have too many of these things when you nave to buy a mass charger for them :)

Any insight on how the red led on pin 10 of the M5StickC is wired up?
I noticed that, using the Arduino IDE
pinMode(10, OUTPUT);
turns the LED on and subsequently
digitalWrite(10, HIGH);
turns it OFF, while
digitalWrite(10, LOW);
turns it ON again

For whatever its worth: I bought 3 to experiment with and they were all fine. I just tested 20 more that I bought for a class. 17 started up in the factory test program. The other 3 had no software installed but worked fine after I downloaded the factory test example.