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[Bug]: SHT40 and SHT41 Temp Sensor is not usable, Output is shown as "NaN" #7522

Description

@Stephan-2025

Category

Hardware Compatibility

Hardware

Heltec Mesh Node T114

Is this bug report about any UI component firmware like InkHUD or Meshtatic UI (MUI)?

  • Meshtastic UI aka MUI colorTFT
  • InkHUD ePaper
  • OLED slide UI on any display

Firmware Version

2.7.3

Description

The current Meshtastic version 2.7.3 recognizes both the SHT40 and SHT41 sensors, but the values aren't read/displayed correctly. They're only displayed as "NaN" (see screenshot). I ordered and tested both types, as they're also on the compatibility list on the Meshtastic website. Unfortunately, it doesn't seem to work anymore (with the latest firmware). I don't know if it used to work before.

Image

Relevant log output

INFO | ??:??:?? 6 Scan for i2c devices

DEBUG | ??:??:?? 6 Scan for I2C devices on port 2

INFO | ??:??:?? 6 SHT31 found at address 0x44

DEBUG | ??:??:?? 6 Scan for I2C devices on port 1

INFO | ??:??:?? 6 1 I2C devices found

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