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Code samples, test code, commentary, etc is going to end up here on the wiki:

• ESP32
  • Wifi
  • Bluetooth
  • 4MB Flash
• LED - GPIO
• Buttons - GPIO
• BME280 / BME680 Support
  • Temperature
  • Pressure
  • Humidity
• TSL2591
  • Full Spectrum Light Sensor
  • IR Spectrum Light Sensor
• MicroSD card slot
• LiPo battery support (charging and discharging)
• CP2104 USB <-> Serial Port
• Good Display 2.13in e-ink support
  • v1.2 is fixed
  • if you have a version before v1.2 replace R16 with a 0.47Ohm or 1Ohm resistor and add an e-ink screen