Final Board Review - Githubissues

ADataDate / Etta_and_Gella

Hardware, research, presentation, and other materials for the Hackaday SuperCon and other events

5 stars 1 forks source link

Final Board Review #9

Open ShawnHymel opened 5 years ago

ShawnHymel commented 5 years ago

I think the others mentioned most of the important issues. The only other thing that stood out to me:

It looks like you only have 5x 1.0uF caps decoupling for the APDS-9960. I'm worried this won't be enough. I could not get the APDS-9960 to function with a single 10uF cap, which is why I used a 100uF tantalum on the SparkFun breakout. If you can't fit 10x 10uF caps in there, I definitely recommend going back to the 100uF tantalum.

ADataDate commented 5 years ago

Yes, I didn't add more because of space reasons but since I went to a full hexagon I have plaenty of room. Thanks for bringing that up again. Oddly, the datasheet only specifies 1uF on LEDA and 10uF on the power side. I ended up added an extra 5 x 1uF on the MCU side but I don't think it will hurt to beef up the caps here if there's any chance of it not working in this workshop. We've pretty much one shot.

ShawnHymel commented 5 years ago

You are correct in that the datasheet calls for 10uF. On my first prototype with the APDS-9960, I had a 10uF on the power side as well. It definitely wasn't enough--whenever I tried to do a "gesture" detection, the voltage would sag below the limit (2.7V?) and reset the sensor.

ADataDate commented 5 years ago

Dang - Caps added!