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Energy tracking part 2

@MartinDix from CurrentCost kindly sent me a dev board so I could interface other feeds to the CurrentCost meter. After some experimentation this is the circuit I intend to use. I have not yet fully finalised values of components but it seems to work pretty well on the breadboard. Note my dev board is version 1.1, the positive connection to ch1 is connected to positive power line.
The idea of the circuit is that a rising edge (start of pulse) is latched until it has been transmitted to the meter.

4 comments to Energy tracking part 2

  • paul_tanner

    Hi John,
    This looks fine. My own meter bounces a lot so I have more logic in the way (done with Arduino).
    Now that I’ve made good savings on this my friends want one too. They have all sorts of old meters.
    What meter are you using? Could you post a photo?
    Mine’s somewhere on my blog @

    Have been looking into how people could get their meter changed. The ony way seems to be switching to first:utility. 2 year contract and appears more expensive than BG. Any thoughts on that?
    Paul (a homecamper)

  • […] for an alternative approach (latching a pulse and clearing it when the cc board transmits) take a look at the circuit and photos on John’s blog. (9 July […]

  • Paul Needham


    Hi am hoping to log my gas usage and have the same meter type ? can you help me ?

    What sort of reed switch did you use ? do the small one’s sold for burglar alarms work ?

    What component values did you settle on ?

    regards Paul

  • I used “RS#530-8933 Micro reed sensor only 8.5Lx3mm dia”. I picked this because of size, and ease of wiring (both wires come out of the same end of the switch – most glass enclosed switches have the wires at each end). The only way to know if a particular switch will work is to hook up a resistance or continuity meter and hold the reed switch in place while the gas dial turns. As for component values please see this post