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27 lines
608 B
27 lines
608 B
7 years ago
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import time
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import gex
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with gex.Client(gex.TrxRawUSB()) as client:
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ser = gex.USART(client, 'ser')
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buf = bytearray()
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def decode(data, ts):
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global buf
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buf.extend(data)
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if len(buf) == 9:
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pp = gex.PayloadParser(buf, endian="big")
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pp.skip(2)
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print("%d ppm CO₂" % pp.u16())
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buf = bytearray()
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if len(buf) > 9:
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# something went wrong, clear
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buf = bytearray()
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ser.listen(decode, decode=None)
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while True:
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ser.write([0xFF, 0x01, 0x86, 0, 0, 0, 0, 0, 0x79])
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time.sleep(1)
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