Sorry if this is has been asked before but I struggled to find a post that answered my question.
To set the scene, I’m using an Ardunio UNO to power my emontx shield along with my emonbase, all this is to monitor my solar PV power generation stats. Everything is up and running now and I’m loving the whole emon ecosystem (great work guys).
So, a couple of basic beginner style questions if you don’t mind:
I’m after some advice for the best method of powering my emontx shield. I’ve been writing software for 20+ years but new to hardware (especially soldering electronics but thoroughly enjoying it!). To highlight my naivety I bought myself a 9v battery and powered up my Arduino thinking it would last maybe 6 months or so, well, you can imagine my shock when I woke in the morning and discovered the battery was dead So, back to the
drawing board. Is my best option to purchase the AC-AC Power Supply Adapter from the OEM shop, is that all I need?
I’ve noticed in my sketch (Shield_CT1234) that the voltage is hardcoded to 240v, if I use the AC-AC power supply is there a way to detect/calculate the actual voltage for a more accurate reading? My voltage is measuring around 248v.