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drivers/hts221: Add HTS221 humidity sensor driver.
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""" | ||
The MIT License (MIT) | ||
Copyright (c) 2013-2022 Ibrahim Abdelkader <iabdalkader@openmv.io> | ||
Copyright (c) 2013-2022 Kwabena W. Agyeman <kwagyeman@openmv.io> | ||
Permission is hereby granted, free of charge, to any person obtaining a copy | ||
of this software and associated documentation files (the "Software"), to deal | ||
in the Software without restriction, including without limitation the rights | ||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
copies of the Software, and to permit persons to whom the Software is | ||
furnished to do so, subject to the following conditions: | ||
The above copyright notice and this permission notice shall be included in | ||
all copies or substantial portions of the Software. | ||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
THE SOFTWARE. | ||
HTS221 driver driver for MicroPython. | ||
Original source: https://github.com/ControlEverythingCommunity/HTS221/blob/master/Python/HTS221.py | ||
Example usage: | ||
import time | ||
import hts221 | ||
from machine import Pin, I2C | ||
bus = I2C(1, scl=Pin(15), sda=Pin(14)) | ||
hts = hts221.HTS221(bus) | ||
while (True): | ||
rH = hts.humidity() | ||
temp = hts.temperature() | ||
print ("rH: %.2f%% T: %.2fC" %(rH, temp)) | ||
time.sleep_ms(100) | ||
""" | ||
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import struct | ||
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class HTS221: | ||
def __init__(self, i2c, data_rate=1, address=0x5F): | ||
self.bus = i2c | ||
self.odr = data_rate | ||
self.slv_addr = address | ||
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# Set configuration register | ||
# Humidity and temperature average configuration | ||
self.bus.writeto_mem(self.slv_addr, 0x10, b"\x1B") | ||
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# Set control register | ||
# PD | BDU | ODR | ||
cfg = 0x80 | 0x04 | (self.odr & 0x3) | ||
self.bus.writeto_mem(self.slv_addr, 0x20, bytes([cfg])) | ||
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# Read Calibration values from non-volatile memory of the device | ||
# Humidity Calibration values | ||
self.H0 = self._read_reg(0x30, 1) / 2 | ||
self.H1 = self._read_reg(0x31, 1) / 2 | ||
self.H2 = self._read_reg(0x36, 2) | ||
self.H3 = self._read_reg(0x3A, 2) | ||
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# Temperature Calibration values | ||
raw = self._read_reg(0x35, 1) | ||
self.T0 = ((raw & 0x03) * 256) + self._read_reg(0x32, 1) | ||
self.T1 = ((raw & 0x0C) * 64) + self._read_reg(0x33, 1) | ||
self.T2 = self._read_reg(0x3C, 2) | ||
self.T3 = self._read_reg(0x3E, 2) | ||
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def _read_reg(self, reg_addr, size): | ||
fmt = "B" if size == 1 else "H" | ||
reg_addr = reg_addr if size == 1 else reg_addr | 0x80 | ||
return struct.unpack(fmt, self.bus.readfrom_mem(self.slv_addr, reg_addr, size))[0] | ||
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def humidity(self): | ||
rH = self._read_reg(0x28, 2) | ||
return (self.H1 - self.H0) * (rH - self.H2) / (self.H3 - self.H2) + self.H0 | ||
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def temperature(self): | ||
temp = self._read_reg(0x2A, 2) | ||
if temp > 32767: | ||
temp -= 65536 | ||
return ((self.T1 - self.T0) / 8.0) * (temp - self.T2) / (self.T3 - self.T2) + ( | ||
self.T0 / 8.0 | ||
) |