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110 lines
3.5 KiB
Python
110 lines
3.5 KiB
Python
# Copyright (c) Quectel Wireless Solution, Co., Ltd.All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.from machine import I2C
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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@file :temp_humidity_sensor.py
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@author :elian.wang@quectel.com
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@brief :Show tempurature and humidity sensor TH20 usage
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@version :0.1
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@date :2022-05-20 11:14:24
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@copyright :Copyright (c) 2022
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"""
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import utime as time
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from machine import I2C
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class TempHumiditySensor:
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"""Read tempurature and humidity sensor value,reset sensor
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"""
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def __init__(self):
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self.__i2c = I2C(I2C.I2C1, I2C.STANDARD_MODE)
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self.__data_cache = None
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# Initialization command
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self.__CALIBRATION_CMD = 0xE1
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# Trigger measurement
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self.__START_MEASURMENT_CMD = 0xAC
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# reset
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self.__RESET_CMD = 0xBA
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# slave address
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self.__i2c_addr = 0X38
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self.init()
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def __write_data(self, data):
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self.__i2c.write(self.__i2c_addr,
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bytearray(0x00), 0,
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bytearray(data), len(data))
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def __read_data(self, length):
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r_data = [0x00 for i in range(length)]
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r_data = bytearray(r_data)
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self.__i2c.read(self.__i2c_addr,
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bytearray(0x00), 0,
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r_data, length,
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0)
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return list(r_data)
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def __get_datas(self, length):
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# Trigger data conversion,send 0xAC, 0x33， 0x00
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self.__write_data([self.__START_MEASURMENT_CMD, 0x33, 0x00])
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time.sleep_ms(200) # at last delay 75ms
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self.__data_cache = self.__read_data(length)
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def __humidity_transformat(self):
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data = self.__data_cache[1:6]
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humidity = (data[0] << 12) | (
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data[1] << 4) | ((data[2] & 0xF0) >> 4)
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return round((humidity / (1 << 20)) * 100.0, 2)
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def __temperature_transformat(self):
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data = self.__data_cache[1:6]
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temperature = ((data[2] & 0xf) << 16) | (
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data[3] << 8) | data[4]
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return round((temperature * 200.0 / (1 << 20)) - 50, 2)
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def init(self):
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self.__write_data([self.__CALIBRATION_CMD, 0x08, 0x00])
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time.sleep_ms(300) # at last 300ms
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def reset(self):
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self.__write_data([self.__RESET_CMD])
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time.sleep_ms(20) # at last 20ms
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def read_temperature(self):
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self.__get_datas(6)
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# check bit7
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if (self.__data_cache[0] >> 7) != 0x0:
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pass
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return False
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temperature = self.__temperature_transformat()
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return temperature
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def read_humidity(self):
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self.__get_datas(6)
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if (self.__data_cache[0] >> 7) != 0x0:
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pass
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return False
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humidity = self.__humidity_transformat()
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return humidity
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def read(self):
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self.__get_datas(6)
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if (self.__data_cache[0] >> 7) != 0x0:
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pass
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return False
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return self.__temperature_transformat(), self.__humidity_transformat()
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