|
| 1 | +""" |
| 2 | +The MIT License (MIT) |
| 3 | +
|
| 4 | +Copyright (c) 2013-2022 Ibrahim Abdelkader <iabdalkader@openmv.io> |
| 5 | +Copyright (c) 2013-2022 Kwabena W. Agyeman <kwagyeman@openmv.io> |
| 6 | +
|
| 7 | +Permission is hereby granted, free of charge, to any person obtaining a copy |
| 8 | +of this software and associated documentation files (the "Software"), to deal |
| 9 | +in the Software without restriction, including without limitation the rights |
| 10 | +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 11 | +copies of the Software, and to permit persons to whom the Software is |
| 12 | +furnished to do so, subject to the following conditions: |
| 13 | +
|
| 14 | +The above copyright notice and this permission notice shall be included in |
| 15 | +all copies or substantial portions of the Software. |
| 16 | +
|
| 17 | +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 18 | +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 19 | +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 20 | +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 21 | +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 22 | +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 23 | +THE SOFTWARE. |
| 24 | +
|
| 25 | +HTS221 driver driver for MicroPython. |
| 26 | +Original source: https://github.com/ControlEverythingCommunity/HTS221/blob/master/Python/HTS221.py |
| 27 | +
|
| 28 | +Example usage: |
| 29 | +
|
| 30 | +import time |
| 31 | +import hts221 |
| 32 | +from machine import Pin, I2C |
| 33 | +
|
| 34 | +bus = I2C(1, scl=Pin(15), sda=Pin(14)) |
| 35 | +hts = hts221.HTS221(bus) |
| 36 | +
|
| 37 | +while (True): |
| 38 | + rH = hts.humidity() |
| 39 | + temp = hts.temperature() |
| 40 | + print ("rH: %.2f%% T: %.2fC" %(rH, temp)) |
| 41 | + time.sleep_ms(100) |
| 42 | +""" |
| 43 | + |
| 44 | +import struct |
| 45 | + |
| 46 | + |
| 47 | +class HTS221: |
| 48 | + def __init__(self, i2c, data_rate=1, address=0x5F): |
| 49 | + self.bus = i2c |
| 50 | + self.odr = data_rate |
| 51 | + self.slv_addr = address |
| 52 | + |
| 53 | + # Set configuration register |
| 54 | + # Humidity and temperature average configuration |
| 55 | + self.bus.writeto_mem(self.slv_addr, 0x10, b"\x1B") |
| 56 | + |
| 57 | + # Set control register |
| 58 | + # PD | BDU | ODR |
| 59 | + cfg = 0x80 | 0x04 | (self.odr & 0x3) |
| 60 | + self.bus.writeto_mem(self.slv_addr, 0x20, bytes([cfg])) |
| 61 | + |
| 62 | + # Read Calibration values from non-volatile memory of the device |
| 63 | + # Humidity Calibration values |
| 64 | + self.H0 = self._read_reg(0x30, 1) / 2 |
| 65 | + self.H1 = self._read_reg(0x31, 1) / 2 |
| 66 | + self.H2 = self._read_reg(0x36, 2) |
| 67 | + self.H3 = self._read_reg(0x3A, 2) |
| 68 | + |
| 69 | + # Temperature Calibration values |
| 70 | + raw = self._read_reg(0x35, 1) |
| 71 | + self.T0 = ((raw & 0x03) * 256) + self._read_reg(0x32, 1) |
| 72 | + self.T1 = ((raw & 0x0C) * 64) + self._read_reg(0x33, 1) |
| 73 | + self.T2 = self._read_reg(0x3C, 2) |
| 74 | + self.T3 = self._read_reg(0x3E, 2) |
| 75 | + |
| 76 | + def _read_reg(self, reg_addr, size): |
| 77 | + fmt = "B" if size == 1 else "H" |
| 78 | + reg_addr = reg_addr if size == 1 else reg_addr | 0x80 |
| 79 | + return struct.unpack(fmt, self.bus.readfrom_mem(self.slv_addr, reg_addr, size))[0] |
| 80 | + |
| 81 | + def humidity(self): |
| 82 | + rH = self._read_reg(0x28, 2) |
| 83 | + return (self.H1 - self.H0) * (rH - self.H2) / (self.H3 - self.H2) + self.H0 |
| 84 | + |
| 85 | + def temperature(self): |
| 86 | + temp = self._read_reg(0x2A, 2) |
| 87 | + if temp > 32767: |
| 88 | + temp -= 65536 |
| 89 | + return ((self.T1 - self.T0) / 8.0) * (temp - self.T2) / (self.T3 - self.T2) + ( |
| 90 | + self.T0 / 8.0 |
| 91 | + ) |
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