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100 lines
3.0 KiB
Python
100 lines
3.0 KiB
Python
from machine import I2C
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import utime as time
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class SensorTH:
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def __init__(self):
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# super(SensorTH, self).__init__()
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self.i2cn = I2C.I2C1
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self.i2c_mode = I2C.STANDARD_MODE
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self.i2c = I2C(self.i2cn, self.i2c_mode)
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self.data_cache = None
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self._init_cmd()
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self.sensor_init()
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def _init_cmd(self):
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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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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 sensor_init(self):
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# 上电等待校准数据。 发送 0xE1 0x08 0x00
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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 sensor_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 _get_datas(self, length):
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# Trigger data conversion
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# 触发测量，发送 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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data = [0x00 for i in range(length)]
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data = bytearray(data)
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self.i2c.read(self.i2c_addr,
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bytearray(0x00), 0,
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data, length, 0)
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self.data_cache = list(data)
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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 read_temperature(self):
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# self.sensor_reset()
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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.sensor_reset()
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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.sensor_reset()
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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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