I have sourced an LPG consumption meter from China with pulse output. I am looking to hook the output up to an arduino to get the consumption metrics. Unfortunately there is not too much documentation available on the unit that I can find. The suppliers inform me that:
- Black wire(signal 1)
- Black wire(signal 2)
- Red wire(earth wire)
So that's a start, I know the unit pulses a signal for every cubic meter of gas consumed. What I'm wanting to know is:
- What are the input [likely] voltages for the unit (or how could I establish this)?
- How do I wire the unit to an arduino?
- I can cook up a sketch to do the reading but what is the signal I am looking for?
The mechanical meter itself has a metallic strip on the 0 digit of the wheel (how it achieves the pulsing itself no doubt) so another approach would be something like this http://phk.freebsd.dk/Gasdims/ which is a more accurate option. For this option any suggestions on what photoreflectors are available for the Arduino which could do the job.