I'm considering my deployment/build of an OpenEnergyMonitor setup.
As I have solar PV, I want to monitor the mains AC voltage, which means I need to be near a wall socket. This causes me problems as I can't also be near the mains meter tails at the same time.
I'm thinking...
Battery powered emonTx in the meter cupboard, transmitting over RFM12B module to a new combined base + GLCD unit - this is where the AC voltage readings would be made.
I'm not planning on using the existing GLCD ST chip drivers for the display as I'm not happy with the amount of RAM they consume (1kbyte for a 128x64 screen) so currently looking to build a library based on SPI interface and port the excellent glcd library (work in progress over at github https://github.com/stuartpittaway/glcd)
A third device will be connected up to my hot water tank and dumping excess electric into heating water, again over a RFM12B link.
Can you think of a reason why this won't work?
Re: Is there interest in an eMonTx and combined Base+GLCD unit?
Unfortunately the way the code works at the moment the AC voltage reading must be made on the emonTx since it needs to happen at the same time as the current reading. I know that sometimes this can be inconvenient. If you fancy trying to work it using a different method please do so and let us know how you get on.
I'm not too sure about the idea for a combined GLCD and Base station since ideally the emonGLCD is often located in the living room, sometimes wall mounted. The internet router (which the base station connects to via cable) is often tucked away in a not so visible location.
Re: Is there interest in an eMonTx and combined Base+GLCD unit?
I assume you're meaning that the timing of the current and voltage is millisecond critical (ie. you wouldn't have time to transmit the values to a remote station) ?
Agreed that not everybody would want a combined device, in my situation, I already have lots of Ethernet in my living room for connecting up the TV, Blueray, XBOX, Freesat receiver etc. so another RJ45 won't hurt !
I suspect a few others will be in a similar situation.
Re: Is there interest in an eMonTx and combined Base+GLCD unit?
monitoring voltage and current on separate devices is in theory possible. I am toying with the idea and I ordered some components to test it. They arrive next week, and then I'll post my results.
Re: Is there interest in an eMonTx and combined Base+GLCD unit?
Look forward to seeing the results.