ESP32 board including Lora RFM95 module optimized for low power deep sleep operation.
- works with single LiFePo battery
- external peripheral (i2c bus, Oled, measurement resistors) can be switxched off by FET transistors
- Open Source. Feel free to modify in KiCad and create your own boards
- I2C bus is decoubled be levelshifters
- optional power supply circuit (solder if you don't want do use LiFePo battery supply)
- optional Rotary Encoder
- there is no UART chip (like CP2104) onboard in order to save power. Board can be programmed by using a simple external USB-to-UART converter (5 Pins: Ground, RX, TX RTS, DTR)
After PowerOn without sending any Lora data
| Mode | Current usage |
|---|---|
| Normal operation | 28 mA |
Switched off all peripheral components and shutdown the RFM95W lora chip.
| Mode | Current usage |
|---|---|
| Deep Sleep | 26 uA |
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Clone this project and open in platformio.
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Clone ttn-esp32 into lib subdir. Switch to branch dev to get it running. More info see https://github.com/manuelbl/ttn-esp32
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Following has to be changed under in ./lib/ttn-esp32 Change following:
src/lmic/config.h #define USE_ORIGINAL_AES
src/aes/lmic_aes.c line 263: u4_t t0, t1=0, t2, t3;