GY-SHT35-D High Precision Digital Temperature and Humidity Sensor Module

Specifications

• Sensor Chip: SHT35-D (High-Accuracy Series)
• Interface: I2C (Up to 1 MHz Fast Mode Plus)
• I2C Address: 0x44 (Default, configurable to 0x45 via ADDR pin)
• Temperature Measuring Range: -40°C to +125°C
• Temperature Accuracy: ±0.1°C (Typical from 20°C to 60°C)
• Humidity Measuring Range: 0% to 100% RH
• Humidity Accuracy: ±1.5% RH (Typical from 0% to 80% RH)
• Response Time: 8 seconds (tau 63%)
• Alert Function: Programmable high/low alert interrupt output pin

Applications

• High-Precision Laboratory & Medical Climate Monitoring
• Pharmaceutical & Cold Chain Storage Temperature Logging
• HVAC Calibration Equipment & Industrial Automation
• Precision Greenhouse & Agricultural Environmental Control
• High-Accuracy IoT Weather Stations

Unlock New Capabilities

• Past Projects: If you have previously built projects using the standard DHT22, SHT30, or SHT31.
• Feature Upgrade: Upgrading to the SHT35-D unlocks extreme laboratory-grade measurement accuracy ($\pm0.1^\circ\text{C}$ vs $\pm0.3^\circ\text{C}$ on SHT31), hardware-configurable I2C alert interrupts, and ultra-low noise digital signal processing.
• Effort Level: Intermediate. Requires basic breadboarding/soldering skills and standard I2C library integration.

Package Includes:

• 1 x GY-SHT35-D High Precision Digital Temperature and Humidity Sensor Module

Frequently Asked Questions (FAQ)

• What does "Unwelded" mean for this module?
  It means the header pins are included in the package but are not pre-soldered to the board, allowing you to solder pins or direct wires based on your project needs.
• What is the default I2C address for the GY-SHT35-D?
  The default I2C address is 0x44.
• How can I change the I2C address on this module?
  Connect the AD/ADDR pin to VIN to change the address from 0x44 to 0x45.
• Is the GY-SHT35-D compatible with 5V microcontrollers like the Arduino Uno?
  Yes, the module works across a 2.4V to 5.5V supply voltage range and handles 5V logic signals safely.
• Can I run two GY-SHT35-D sensors on the same I2C bus?
  Yes, by setting one sensor's ADDR pin to GND (address 0x44) and the other sensor's ADDR pin to VIN (address 0x45).
• What is the onboard alert pin used for?
  The AL/ALERT pin triggers a digital output signal when temperature or humidity breaches user-defined high or low thresholds.
• How does the internal heater work?
  The internal resistive heater can be enabled via software commands to warm the sensor chip, evaporating condensation and clearing accumulated moisture.
• Does enabling the heater affect the temperature reading?
  Yes, while active, the heater increases the chip's internal temperature and lowers relative humidity readings. It should only be used briefly for drying/defogging.
• What is the measurement speed of the SHT35-D?
  The SHT35-D supports single-shot and periodic measurement modes up to 10 measurements per second (10 Hz).
• Do I need pull-up resistors on the SCL and SDA lines?
  The GY-SHT35 breakout module includes onboard pull-up resistors, so additional external resistors are usually not required for short wire lengths.
• How can I use this module with a Raspberry Pi?
  Enable I2C on the Raspberry Pi using raspi-config, connect VIN to 3.3V, GND to GND, SCL to GPIO3, and SDA to GPIO2, then use Python smbus2 or CircuitPython libraries.