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| -rw-r--r-- | drivers/hts221/hts221.py | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/drivers/hts221/hts221.py b/drivers/hts221/hts221.py new file mode 100644 index 000000000..fec52a738 --- /dev/null +++ b/drivers/hts221/hts221.py @@ -0,0 +1,91 @@ +""" +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) +""" + +import struct + + +class HTS221: + def __init__(self, i2c, data_rate=1, address=0x5F): + self.bus = i2c + self.odr = data_rate + self.slv_addr = address + + # Set configuration register + # Humidity and temperature average configuration + self.bus.writeto_mem(self.slv_addr, 0x10, b"\x1B") + + # Set control register + # PD | BDU | ODR + cfg = 0x80 | 0x04 | (self.odr & 0x3) + self.bus.writeto_mem(self.slv_addr, 0x20, bytes([cfg])) + + # 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) + + # 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) + + 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] + + def humidity(self): + rH = self._read_reg(0x28, 2) + return (self.H1 - self.H0) * (rH - self.H2) / (self.H3 - self.H2) + self.H0 + + 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 + ) |