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- Pin GPIO Desc Usage
- ----------------------------------------------------------------------
- D3 GPIO0 IO, 10k Pull-up left Button (+)
- D4 GPIO2 IO, 10k Pull-up, BUILTIN_LED middle Button (-)
- D5 GPIO14 IO, SCK right Button (Mode)
- D7 GPIO13 IO, MOSI DHT22 Temp/Hum sensor
- D0 GPIO16 IO relay output, control heating
- D2 GPIO4 IO, SDA I2C SDA
- D1 GPIO5 IO, SCL I2C SCL
- D6 GPIO12 IO, MISO PIR sensor
- D8 GPIO15 10k Pull-down, SS -- unused --
- Hardware via I2C:
- LCD 1602 0x27
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