The HDC1008 is a digital humidity sensor with integrated temperature sensor that provides excellent measurement accuracy at very low power. The device measures humidity based on a novel capacitive sensor. The humidity and temperature sensors are factory calibrated.
The sensing element of the HDC1008 is placed on the bottom part of the device, which makes the HDC1008 more robust against dirt, dust, and other environmental contaminants. The HDC1000 is functional within the full –40°C to +125°C temperature range.
- Relative Humidity (RH) Operating Range 0% to 100%
- 14 Bit Measurement Resolution
- Relative Humidity Accuracy ±3%
- Temperature Accuracy ±0.2°C
- Supply Voltage 3 V to 5 V
- I2C Interface
Save the following as HDC1008.py
import smbus import time # Get I2C bus bus = smbus.SMBus(1) # HDC1000 address, 0x40 bus.write_byte_data(0x40, 0x02, 0x30) # Send temp measurement command bus.write_byte(0x40, 0x00) time.sleep(0.5) # Read temp data data0 = bus.read_byte(0x40) data1 = bus.read_byte(0x40) # Convert the data temp = (data0 * 256) + data1 celsTemp = (temp / 65536.0) * 165.0 - 40 fahrTemp = celsTemp * 1.8 + 32 # Send humidity measurement command bus.write_byte(0x40, 0x01) time.sleep(0.5) # Read humidity data data0 = bus.read_byte(0x40) data1 = bus.read_byte(0x40) # Convert the data humidity = (data0 * 256) + data1 humidity = (humidity / 65536.0) * 100.0 # Output data print "Relative Humidity : %.2f %%" %humidity print "Temperature in Celsius : %.2f C" %celsTemp print "Temperature in Fahrenheit : %.2f F" %fahrTemp
Run the following from the command line using sudo python HDC1008.py