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Goal

Create arduino based 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 and voltages

to devide between multiplexers

Sensoraddressalt addressspecVmin-VmaxVtyp3.3v5v
Senserion SHT2x0x40 (64)0x41 (65)20,21,252.1-3.6v3v(tick)(minus)
Senserion SHT3x0x44 (68)0x45 (69)SHT3x2.15-5.5v3.3v(tick)(tick)
Senserion SHT8x0x44 (58)
SHT852.15-5.5v
3.3v(tick)(tick)
Meas(1) HTU21D0x40 (64)
HTU21D1.5v-3.6v3v(tick)(minus)
Silicon Labs Si70210x40 (64)
pdf1.9v-3.6v-(tick)(minus)
Bosch(2) BMEx800x76 (118)0x77 (119)6801.71v-3.6v1.8v(tick)(minus)
Bosch(2) BME2800x76 (118)0x77 (119)2801.71v-3.6v1.8v(tick)(minus)
Ti(3) HDC10800x40 (64)
pdf2.7v-5.5v3v(tick)(tick)
AOSONG DHT120x5C (92)
*pdf2.7-5.5v5v(tick)(tick)
AOSONG AM23200x5C (92)0xB8 ?*pdf3.1-5.5v5v(minus)(tick)

1 TE Connectivity Measurement Specialties

Texas Instruments

3 Bosch Sensortec

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