• Relative humidity accuracy ±2%
• Temperature sensor accuracy 0.2 °C
• Good stability at high humidity
• 14-bit measurement resolution

The Digilent Pmod HYGRO is small relative humidity and temperature sensor. With the TI HDC1080, you can determine the relative humidity of the environment with up to 14 bits of resolution.

Functional Description

The Pmod HYGRO is designed to digitally report the relative humidity and ambient temperature upon request by the host board. Up to 14-bits of resolution for each sensor may be collected by allowing for longer conversion times. A resistive heating element can be enabled to drive off condensation that accumulates on the sensor after being exposed to high humidity conditions.

Interfacing with the Pmod

The Pmod HYGRO communicates with the host board via the I2C protocol. By first sending the 7-bit I2C address of 1000000 (0x40) and then a read/write bit (high/low logic level, respectively), followed by the register address of interest at a maximum clock frequency of 400 kHz, users can both configure and read from the Pmod HYGRO. Header J2 on the Pmod HYGRO passes through all of the signals present on the main Header J1 to allow for the daisy-chaining of multiple I2C compatible modules.