mirror of
https://github.com/m5stack/M5GO.git
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Mike Causer
30 lines
858 B
Python
30 lines
858 B
Python
"""
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MicroPython Aosong DHT12 I2C driver
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https://github.com/mcauser/micropython-dht12
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MIT License, Copyright (c) 2016 Mike Causer
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"""
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class DHTBaseI2C:
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def __init__(self, i2c=None, addr=0x5c):
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if i2c == None:
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from machine import I2C, Pin
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self.i2c = I2C(sda=21, scl=22)
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else:
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self.i2c = i2c
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self.addr = addr
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self.buf = bytearray(5)
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def measure(self):
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buf = self.buf
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self.i2c.readfrom_mem_into(self.addr, 0, buf)
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if (buf[0] + buf[1] + buf[2] + buf[3]) & 0xff != buf[4]:
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raise Exception("checksum error")
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class DHT12(DHTBaseI2C):
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def humidity(self):
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return self.buf[0] + self.buf[1] * 0.1
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def temperature(self):
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t = self.buf[2] + (self.buf[3] & 0x7f) * 0.1
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if self.buf[3] & 0x80:
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t = -t
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return t |