I have a project where I would like to detect whether a pump is running in order display where hot water is being transferred from (eg. solar thermal, log burner). There will also be a couple of temperature sensors on the flow pipes which will show me the temperature of the water but not whether it is moving or not!
It would be nice to be able to use the emonth for this with a couple of ds18b20 sensors connected externally. I currently have two ideas:
- Use a CT clamp to detect current consumption wired to a spare analog pin in the emonth - is there one available?
- Install a relay in the pump circuit and use the secondary coil to trigger a digital input on the emonth.
Has anyone done this before, any thoughts on which way would be best?