I am an energy auditor in the US and use emonPi on a nearly weekly basis for monitoring client’s homes. I’ve also installed several systems for clients who have rentals with one meter and need to bill renters separately. In spite of the steep learning curve and occasional glitches, I absolutely love these systems.
Specifically, I’m looking for a way to strap a hall effect sensor to a motor and be able to record RPM at a specific interval (say every 5 seconds) to EmonCMS on the EmonPi. I can do this via hardwired cabling, or preferably, wirelessly.
Having this data is essential for me to know how often a motor turns on and what speed it spins, particularly useful when I need to monitor pumps that have variable speeds and/or when I am unable to place a CT around the hot leg of the circuit. Also, having the RPM data recorded can then let me overlay that with temperature data and assess efficiency. At its most simple use, I can know when a motor turned on/off. kWh can then be calculated via nameplate data.
I am not an electronics or programming geek! So I’m looking for detailed information as to how to go about this project. If I get the Hall Effect breakout board kit from the shop.OpenEnergyMonitor.com site (https://shop.openenergymonitor.com/acs7-hall-effect-breakout-board-kit/), how would I interface that hardware with EmonCMS and be able to graph that data from my EmonPi with EmonCMS? Or am I simply looking at the wrong product?
Detailed responses greatly appreciated