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18 lines
407 B
18 lines
407 B
import time
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import gex
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# basic NDIR CO2 sensor readout
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with gex.Client(gex.TrxRawUSB()) as client:
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ser = gex.USART(client, 'ser')
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while True:
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ser.clear_buffer()
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ser.write([0xFF, 0x01, 0x86, 0, 0, 0, 0, 0, 0x79])
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data = ser.receive(9, decode=None)
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pp = gex.PayloadParser(data, endian="big").skip(2)
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print("%d ppm CO₂" % pp.u16())
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time.sleep(1)
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