Final Board Review
ShawnHymel opened this issue · comments
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.
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.
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.
Dang - Caps added!