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/
Posts made by wikistik
RE: What grove modules are compatible with the m5stickc?
RE: Ultra Low Power Stick, Is There a Market?
It would be a good project but would result in a completely different product. For greatly extending the run time of the existing product how about a large external battery such as a power bank connected to the usb jack? Quick, cheap, and easy and should do fine for demonstrations and prototyping.
RE: Does the Env Hat cover the IR and LED?
@pgb The case of the ENV hat definitely covers both. I posted a pic of the insides here
It would be pretty easy to open the ENV hat with a hex wrench and drill out a hole so the LED is easily visible without damaging the ENV hat. The IR transmitter might need a light pipe (if those work for IR).
RE: M5StickC: turn off screen completely
@multihelix It's not going to happen. There is no way to turn the backlight or the rest of this device completely off. I think of the on board battery more like a super capacitor, it gives you enough power for a few minutes of testing but for anything else you need an external power supply with a real on/off switch.
RE: Max 5v current out
@klimbot Here are some results of practical testing:
Using the 5v header pin with the screen set to black and set to minimum brightness, flashing the led to make sure the cpu was still operating: I could draw about 400ma at the load (fluctuated between 388 and 402 using an incandescent light as a load). This was the case on both USB and battery power.
Using the 5v header pin with the screen displaying some text: the same load drew 500ma but it shut the screen down and the computer did recognize the unit until I replugged it in.
So let's say under 400ma with the screen "off" and considerably less with it on.
M5StickC hardware accessory notes
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.
RE: [Solved] ENV Hat on M5Stick-C not working at all
I just tried the ENV hat on a M5StiickC with the default Arduino sketch and it appears to be working fine. It's putting out temp, humidity, compass, and pressure readings that all make sense. Make sure you have all the required libraries installed, especially the Adafruit BMP280 library
RE: 5V input concern on M5StickC
Thanks for the info @world101. I have posted my notes on the 5 volt concern with the M5StickC here: http://tinkerfarm.net/projects/the-m5stickc/the-5-volt-danger-with-the-m5stickc/.
I will update these if new data emerges.
RE: 5V input concern on M5StickC
@grelm If you find out anything more about the ability of the M5StickC to handle 5v IO please post it. Once I have a second unit I will probably disassembly one to see if I can identify any protection on the board. Meanwhile I am looking at level shifters but there is nothing on the market that is easy to interface with the grove connector. May have to resort to making up something inline that uses only 5v to power both the high and low side (with a regulator from the 5V) and see if that works.