I2C CHT8305C Temperature and Humidity Sensor

This temperature and humidity sensor from DFRobot sits in a 304 stainless steel housing on a 1.5 m cable with Dupont female connectors. It measures via I2C and has two 4.7 kΩ pull-up resistors and a 100 nF filter capacitor built in, so it can be operated directly on an Arduino. A programmable alarm function for temperature and humidity is available.

Note: Since October 2025 DFRobot supplies a new version with the CHT832X chip instead of the CHT8305. It measures more accurately (±1.5 %RH and typically ±0.1 °C instead of ±3 %RH and ±0.5 °C) and has a different I2C address. It can be recognised by the SCL wire: green on the CHT832X, white on the CHT8305. Example code for both versions is in the wiki.

Note: The connection cables can be converted to male pins with Dupont cables M-M, so that they also fit an Arduino UNO.

Recommended Accessories:

• Dupont Cables M-M 10cm 20 Pieces
• Gravity IO Expansion Shield for Arduino V7.1

Features:

• Digital measurement of temperature and humidity via I2C
• Programmable alarm function for temperature and humidity
• 304 stainless steel housing, resistant to impact, heat, cold and chemicals
• Pull-up resistors and filter capacitor built in
• 1.5 m cable with 2.54 mm Dupont female connectors

Application Examples:

• Climate in greenhouses and grow tents
• Monitoring refrigerators, freezers and the cold chain
• Controlling ventilation, air conditioning and dehumidifiers
• Weather stations and data loggers

Documentation:

• Wiki DFRobot SEN0546
• Example code CHT8305 for Arduino (DFRobot Wiki)
• Example code CHT832X for Arduino (DFRobot Wiki)

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: SEN0546
• Chip: CHT8305 (previous version) or CHT832X (from October 2025)
• Operating voltage: 2.5 to 5.5 V (CHT8305), 1.8 to 5.5 V (CHT832X)
• Operating current: typically 1.5 µA, max. 3.0 µA (CHT8305), typically 5.5 µA at 3.3 V (CHT832X)
• Temperature range: -40 to 125 °C
• Humidity range: 0 to 100 %RH
• Temperature accuracy: ±0.5 °C at 0 to 50 °C (CHT8305), typically ±0.1 °C at 10 to 50 °C (CHT832X)
• Humidity accuracy: ±3 %RH at 20 to 80 %RH (CHT8305), ±1.5 %RH (CHT832X)
• Interface: I2C, address 0x40 (CHT8305) or 0x44 (CHT832X)
• Wiring: red VCC, black GND, white or green SCL, yellow SDA
• Cable: 1.5 m, 2.54 mm Dupont connector
• Housing: 304 stainless steel, diameter 5 mm
• Weight: 36 g

Scope of Delivery:

• 1× I2C temperature and humidity sensor with stainless steel housing and 1.5 m cable