Tag Archive: Meter

Thanks to ADH Heating Services I now have jeenodes counting pulses from my mains cold water supply:

Boiler hot water outlet:

And gas meter:

The pulses are being pulled into DomotiGa:

Which allows me to graph with RRDTool:

I also created my own module for DomotiGa to hook up to my custom 433Mhz RF receiving jeenode- I now have my window/door sensors (along with a bunch of rogue devices?) appearing:

I’m not best sure how to tackle the fact that the devices don’t issue an idle command when the alert has finished (i.e. when the door is closed or the fire is put out?). I’m considering trying out the built in DomotiGa feature to revert the values after 1minute or so (the smoke alarm should continue to send data whilst the alarm is being sounded so this shouldn’t be a problem).

I’m still troubleshooting a few problems- for example USB serial ports failing to open with error: "Cannot open serial port (#5)":

And some jeenodes going offline. Hopefully I will have more time to look into this later in the week.


Current Cost OptiSmart

My OptiSmart arrived this afternoon from Current Cost and I immediately dismantled it :)

Fairly amusing to see how tiny the circuitry was, and that the batteries are taking up 80% of the space inside the device!

The board itself looks pretty straight forward (although my knowledge is pretty limited in this area). I can see the RF module and a PIC chip with what appears to be a header available for reflashing?

My gas meter has an RJ11 connector with 2 wires staying open about 80% of the dial on the meter then closing for the remaining 20%. I hoped to replace the standard sensor with a straight forward RJ11 cable.

I spliced into the cable which comes with the OptiSmart (to read the blinking LED from newer meters) but couldn’t determine what each of the 4 wires in the sensor cable was doing. *EDIT* Upon further investigation, it appears the green wire is GND and red is +3V. Shorting any combination of them didn’t seem to count a pulse on the EnviR display so it doesn’t look like I can connect it to my gas meter as simply as I was hoping. *EDIT* Cracked it :) Join the green and brown wires then place the reed switch between the red and black wires- voila!

I need to adjust it to convert from cubic feet of gas consumed to the equivalent watts but then i’m all set!

I will likely try more experimenting tomorrow- worst case scenario I guess I could fashion a circuit which blinks an led on the opening or closing of the RJ11 connection but it seems a bit mad to need to go that route!


%d bloggers like this: