Use ESP32-S3

[peter-tanner]

• [ ] Change STM32F302RBT6 -> ESP32-S3
  • [ ] Change layout to accommodate different layout and the ground pad
  • [ ] Antenna for BLE/Wi-Fi
  • [ ] Select a cheap chip antenna from
  • [ ] Use some form of storage which persists during brownout to store state
  • [ ] Investigate RTC SRAM, calculate retention time with 80 mF supercapacitor
  • [ ] Crystal capacitors
  • [ ] Check USB debugging interface/whether JTAG is required
  • [ ] Validate ESP32-S3 ADC performance on development board, check if capacitors are required

[txvvgnx]

Note on the chip antenna: 2450AT18D0100001E from Johanson Tech has worked with this design: https://github.com/hxelec/s3p