HDC1080.py – Small micropython library for esp8266 (should work on ESP32 as well) to work with HDC1080 humidity and temperature sensor.

HDC1080.py

#Small micropython library for esp8266 (should work on ESP32 as well) to work with HDC1080 humidity and temperature sensor.
#
#It consists of one class with three methods.
#Constructor:
#HDC1080.__init__(self, i2c, address=0x40, heater=False)
#You have to pass I2C object and sensor address (if not default). Heater option enables internal heater which is usefull in high humidity environment to prevent condensation on sensor. Heater only works during measurements so you have to take them frequently to have desired effect. If device with given address is not found exception is raised and all found device adresses are printed.
#
#To measure temperature (Celsius degrees) and relative humidity you have to use object.read_temperature() and object.read_humidity() respectively. Those are synchronous calls and both take slightly more than 7ms.
#It's possible to retrieve last measured parameters with object.temperature and object.humidity.

from time import sleep_ms

class HDC1080:
    def __init__(self, i2c, address=0x40, heater=False):
        devices = i2c.scan()
        assert address in devices, "Didn't find sensor with %d address. Found %s instead." % (address, devices)
        self.i2c = i2c
        self.address = address
        sleep_ms(15)
        #Setting measurements to be separate, turning on heater
        buff = bytearray(2)
        if heater:
			buff[0] = 1 << 6
        i2c.writeto_mem(address, 0x02, buff)

    def read_temperature(self):
        self.i2c.writeto(self.address, bytearray(2))
        sleep_ms(7)
        self.temperature = self.i2c.readfrom(self.address, 2)
        self.temperature = int.from_bytes(self.temperature, "big") / 2**16 * 165 - 40
        return self.temperature

    def read_humidity(self):
        self.i2c.writeto_mem(self.address, 0x01, bytearray(1))
        sleep_ms(7)
        self.humidity = self.i2c.readfrom(self.address, 2)
        self.humidity = int.from_bytes(self.humidity, "big") / 2**16 * 100
        return self.humidity