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GY-21 Si7021 (with voltage regulator) AliExpress: 2$
AliExpress: 6$ (for 2)
Image AddedImage Added
Adafruit Si7021 (with voltage regulator) Amazon:  7$+4$ + tax


Info

Compatible with SHT2x by address and protocol


AliExpress: 3.5$

Lib: https://github.com/adafruit/Adafruit_Si7021

Demo: https://github.com/adafruit/Adafruit_Si7021/blob/master/examples/si7021/si7021.ino

Datasheet: https://www.silabs.com/documents/public/data-sheets/Si7021-A20.pdf



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