02/25/2016 at 08:00 •
Started prototyping with a Raspberry Pi 2 and a 5V Trinket with a 74LVC245 level shifter. I needed the level shifter while I wait for my 3V Trinket to arrive.
02/25/2016 at 05:46 •
I added a snap shot of the state diagram that walks through the start up and shutdown of the system.
Here's a short video that steps through the logic.
02/24/2016 at 05:17 •
I've tried explaining this to my cats, but their still a bit lost on the signaling between the Trinket, the Raspberry Pi Zero, and the PowerBoost.
I plan to draw out a state diagram that shows the how the pieces interact over time.
02/24/2016 at 03:14 •
Remove Power Switch
After looking at more details on the Adafruit PowerBoost 500 Charger, I noticed the breakout for the ENable pin. Looks like I don't need the FET power switch after all. The PowerBoost can handle the power switching. Yay!
I've remove the power switch and added an Adafruit Trinket - 3.3V. That will give the project the smarts it needs.
I increased the size of the LiPo battery from 150 mAh to 500 mAh.