I am trying to figure out what is the voltage lvl for a logic 1 and logic zero and which input pin will give us the reading signal. HSW or ALR. This for the parallax methane sensor. Thank you
ALR is the alarm output pin, and HSW controls the heater. The heater must be on to sense gas, and the reading may take some time to stabilize after the heater is turned on. All this information is available in the gas sensor board guide.
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