16 lines
990 B
Markdown
16 lines
990 B
Markdown
[x] double-check resistors and capacitors - can I do with fewer unique values?
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[x] double check sd card keep-out areas with datasheet
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[x] swap sda/scl i2c test points
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[x] Do we even need any pullup/down resistors?? can't the esp32 do this internally? (update: it can)
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[x] i2c Pins need reassigned so they match what is on the dev boards, which use 17/18 for the OLED display. Or we somehow also squeeze an OLED into the dev boards. Or maybe replace the OLED entirely with just some LEDs to indicate sensor state?
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R2:
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[ ] some kind of power consumption measuring chip? INA233?
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[ ] protection diodes on usb lines?
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[ ] pull-down resistor before LED strip?
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[ ] CS line on SD card
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R3:
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[ ] MP2662 lipoly charger chip on a 3.7v battery at 2500mAh
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[ ] redesign power supply to use a buck booster from the 3.7v battery to 5v for the display, and a simple divider directly off the battery for 3.3v for system power
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[ ] soldering ports to accept 3W at 6VAC to charge the battery from the bike dynamo |