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GPS modules
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User Button
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BMP/BME280 sensor
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BME680 sensor
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MCU-811 (CCS811) CO2 sensor
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LPS33 Pressure sensor (WISBLOCK module)
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Onewire temperature sensor
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INA226 Current/voltage sensor
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RTC DS3231 Real-Time-Clock with battery
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MCP23017 16-PIN I/O (from version 4.33c)
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ANALOG GPIO with voltage divider