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v0.4 Electrical Plan
Parkview785 edited this page Sep 21, 2022
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10 revisions
- determine why/if battery 5V jump start is needed. Hypothesis: power MOSFET Rds might be too high? Loosing too much voltage across the MOSFET?
- test and integrate the external PDM microphone board
- test more GPIOs - LED indicator, capacitive touch
- connect 3.3VA to 3.3V
- change TP4056 to correct package, or replace it
- work with mechanical for better mounting holes: Changed holes to M1.6 for screws, and a M1.5 alignment pin hole
- fix silk screen so all is printed
- boards sometimes need 5V jumpstart to run off of 3.7V battery
Switch must stick out the side of the PCB, into the existing slots on the glasses frame, and be flush with the outside case.
We need a more efficient power solution that works to use full capacity of 2x single cell LiPoly batteries. We also need a discharge and charging solution that balances the batteries for safety and longevity. We also want a coloumb counter so we can always know the current charge state of the device.
- choose battery scheme, charging IC(s), voltage IC, columb IC
- integrate into board
- see v0.4 scratchpad wiki page for list of possible chips to incorporate (see link below)
- choose RGB LEDs: WS2812B-2020
- work with mechanical to identify placement - on endpiece sensor boards?
- add connector pads for external LEDs
- integrate 2+ user-facing RGB LEDs into current design (only one needed)
- add a 3 pin GND, 3V3 100mA, GPIO26 DAC connector to allow experimentation with composite video
- find smallest speaker we can use with ESP32 (see v0.4 scratchpad wiki page)
- work with mechanical to get proper positioning
- integrate into current board
- select true I2S microphones - see v0.4 scratchpad wiki page: i2S MEMS Microphones
- change external microphone board to incorporate I2S microphone
- onboard CH9102 UART - is it working ok?
- are the test points ok. Footprint ok?
- chip antenna, acceptable range?