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