Add SHT21 sensor support#9582
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Tomas-Kuchta-FPV wants to merge 4 commits intomeshtastic:developfrom
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Feb 10, 2026
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is there a register you can look up on the SHT21 that is unique to that model, or at least able to distinguish it from the other chips that share the address? That way we could detect it and use it without a firmware rebuild.
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Looking at the datasheets, maybe the INA219 calibration register (05h) being all zero at reset would be enough? |
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Description
This PR adds support for the SHT21 humidity and temperature sensor to Meshtastic. The SHT21 is a low-cost, low-power environmental sensor that complements the existing SHT3x support.
Changes
Sensor Details
INA_ADDR)-D HAS_SHT21=1compile flagTesting
Notes
The SHT21 shares the I2C address (0x40) with the INA power monitoring chip. Current implementation uses a compile-time flag to select which sensor is used. Future improvements could include runtime detection/probing if both sensors need to be supported simultaneously.
Related: meshtastic/protobufs#855