7Semi SHT40 Temperature & Humidity Sensor Breakout Board with 1.27mm Pitch

What this module is

The 7Semi SHT40 Temperature & Humidity Sensor Breakout (1.27mm pitch) is a high-precision digital environmental sensor that measures:

• Temperature

• Humidity

It is based on Sensirion's 4th-generation SHT40 sensor, known for very high accuracy and stability.

Key Specifications

• Interface: I2C (easy Arduino/ESP32 use)

• Operating Voltage: ~3.3V (some boards support 3.35V)

• Temperature Range: -40C to +125C

• Temperature Accuracy: 0.2C

• Humidity Range: 0100% RH

• Humidity Accuracy: 1.8% RH

• Resolution:

Key Features

• Very high accuracy (much better than DHT11/DHT22)

• Fully calibrated digital output (no calibration needed)

• Ultra-low power ideal for battery projects

• Compact design (1.27mm pitch header) fits small PCBs

• Stable long-term performance

Pinout (1.27mm Pitch Board)

• VCC 3.3V

• GND Ground

• SDA I2C Data

• SCL I2C Clock

Default I2C address: 0x44

Working Principle

• Uses CMOSens:

• Signal processing

Outputs digital calibrated values directly (no analog noise)

Applications

• Weather stations

• Smart home automation

• Smart agriculture / greenhouse

• Industrial monitoring

• Data logging systems

• Air quality & environment sensing

Important Notes (VERY IMPORTANT)

• Do not touch sensor surface affects readings

• Needs proper airflow for accuracy

• Avoid placing near:

  • Heat sources (MCU, regulators)

• 1.27mm pitch requires special connector or adapter

  SHT40 vs Other Sensors

  When to use this

  Use SHT40 if you want:

  • High accuracy environmental sensing

  • Reliable IoT systems

  • Battery-powered devices

  • Professional-grade projects

  When NOT to use

  Avoid if:

  • You need very cheap solution use DHT11

  • You need pressure sensing use BME280

  Final Understanding

  This sensor = pr Much better than basic sensors used in beginner kits