I'm wondering the best way to connect this flow meter to my Arduino UNO. It is an ultrasonic flow meter with multiple outputs.
I have experience hooking up a 10 dollar flow meter.
The cheap model has voltage, ground, and a signal output. It can be powered with the arduino, and I connect the signal to pin 2 using interrupts. No problem.
The expensive model has SIG (+) and RTN (-) outputs for a 4-20ma line and SIG (+) and RTN (-) outputs for a frequency/totalizer line. It has it's own power line.
I'm assuming the frequency/totalizer line is the pulse line? I can feed the SIG(+) line into pin 2 and it would be like the pulse line like a cheap model? If so, do I just ground the return line? Would this be better than using the 4-20ma analog line?
No, I wish I could, but I cannot test this to confirm. I'm building this for someone who has the flow meter overseas, so I need to guess correctly the first time. I can make a few code changes after the fact, but I need to understand how to accept the output into the arduino before I send it.