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Goal

Arduino device to compare data for as much t/RH sensors as possible without manual sensor switch

Preparation

Use of same sensor on i2c usually limited by 1 or 2 (using ALT i2c address) of same type. And SHT20, SHT21, SHT25, HTU21 is actually same type, so to be able to compare measurement there is need to use i2c multiplexer. In case of 8 line multiplexer there is possibility to have 8-16 sensor of same time to be connected with Arduino.

Sensor i2c addresses

Sensoraddressalt addressspec
Senserion SHT2x


Senserion SHT3x


Senserion SHT8x


Meas(1) HTU21D


Silicon Labs Si7021

pdf
Bosch BME2800x760x77pdf
Bosch BME6800x760x77pdf
Ti(2) HDC10800x40
pdf
AOSONG DHT12


AOSONG AM2320






























1 Measurement Specialties

Texas Instruments


LineSHT2xSHT3xHDC1080Si7021BMxx80DHTx2
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B





C





D





E





F





G





H





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