Mechaxil Climate Sensor (SHT4x)

Compact temperature and humidity sensor module based on the Sensirion SHT4x series.

Status: Review

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Overview

This board provides accurate temperature and relative humidity measurements over I2C.

• Sensor: SHT4x
• Interface: I2C
• Default Address: 0x44
• Voltage: 3.3V only

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Features

• High accuracy temperature and humidity sensing
• Mechaxil 5-wire I2C connector (JST S5B-PH)
• M3 Mounting holes for easy integration

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Connector Pinout

SDA - GND - 3V3 - GND - SCL

Notes

• Designed for robust I2C communication

• Dual GND improves signal return paths

• Compatible with:

  • Twisted pair cables (2x2+1)
  • Ribbon cables

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Electrical

• Supply voltage: 3.3V

• I2C speed:

  • 100 kHz recommended
  • 400 kHz supported

Pull-ups

• Included by default on module

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Layout Notes

• Sensor placed to minimize heat influence
• Keep airflow around sensor for best accuracy

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Usage

1. Connect to a 3.3V I2C controller
2. Use address 0x44
3. Send measurement command
4. Read temperature and humidity data

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Repository Contents

• . - Kicad files
• /assets - 3D files, images etc.
• /documentation - additional documentation

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Datasheet

Sensirion SHT4x datasheet: https://sensirion.com/media/documents/33FD6951/67EB9032/HT_DS_Datasheet_SHT4x_5.pdf

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License

CERN Open Hardware Licence Version 2 - Weakly Reciprocal

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Notes

• This module measures relative humidity
• Absolute humidity can be calculated in software
• Not 5V tolerant

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Mechaxil Ecosystem

This board is part of the Mechaxil modular hardware system focused on:

• Accessibility
• Robust design
• Practical learning

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