EmonTx4 Documentation

I was having a look on the pulse counting Docs page at
and it is shorter and rather different from the original Guide page at

In particular I was looking for the 12 input pulse sensor, but these links in the original pulse counting Guide page (in the Learn section just above the appendix)

don’t seem to have equivalent content in the Docs pages. The links direct me to the Docs pages, but there is no relevant content in the Docs/Pulse counting section… Are these topics still available somewhere?

Also these two links at the bottom of the Docs page don’t seem to work for me

One other point - when you have finished reading something in the docs pages, how do you get back to the OEM home page, apart from editing the URL in the browser - or am I missing something?

I understand that the Docs section is a work in progress, so I apologise if I’m putting the cart before the horse!

I’m afraid you are. Not only is the documentation being updated, so has emonCMS in the last day or two, and don’t forget there’s ongoing work on the emonTx V4 - not counting the normal sales activity of the shop.

Trystan’s been writing to me this afternoon regarding the V4 software, I don’t know what day it is where you are, but it’s still Sunday here - so he’s not even had the weekend off.

We don’t mind these things being pointed out, but you mustn’t expect miracles.

Thanks for the update. I just wanted to note these things down while they were still fresh in my memory. I understand that you are all very busy at the moment - there’s no urgency.

Hello @rupert

Ah, interesting, that development was a bit of a stub from way back in the first few years of this project. I thought perhaps it was time to retire it. I wonder what is best to do with that kind of thing? should these be kept in indefinitely or is it ok to remove now? or host elsewhere perhaps. One option might be to access via the internet archive, e.g: https://web.archive.org/web/20190114035618/https://learn.openenergymonitor.org/electricity-monitoring/pulse-counting/12-input-pulse-counting

Will take a look at those broken links.

Yes there needs to be an easier option to navigate back.

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I think an archive section would be good for the docs - heavily caveated of course!

I think I’ve mentioned this too, quite a few times, and going back quite a few years.

And heavily labelled - can you ‘rubber stamp’ “OBSOLETE” on an overlay so that it’s unmissable?

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Hello @TrystanLea

Thanks very much for the reply, as I know you are very busy at the moment and I don’t want to add to your workload!.

The reason I was interested in the 12 input pulse sensor was that I am looking at the various ways to monitor the optical pulses from two meters (mains and solar). This would be just as a comparison to my emonTx4 measurements, which seem on a brief check to be very close to the meters, so the emonTx4 accuracy is really good. It would also save me reading the meters and writing the numbers down! My emonTx4 can monitor one pulse source, and my emonPi can measure another, but the emonPi is in the living room measuring temperature! So I was just working out what to do.

Thanks for the link to the wayback machine (internet archive) - I hadn’t thought of looking there. I did find that someone had modified the design to read several SDM120 meters (S0 contact output) that he had in his meter cupboard - so the design has been used! Although it only provides power measurement, it may be useful for heat pump installations as an alternative to modbus.

I think it would be nice to archive these old designs, as they may provide inspiration for new ideas. Also they may be useful in a historical perspective to understand the development history of the products.

In consideration of the wayback machine, I don’t know if it archives everything, or how stable its links are. On the other hand a local archive would require some extra disk space, but would be under OEM control.

Just looking at the 12 input pulse sensor article on the wayback machine, many (all?) of the links in it have not been captured by the wayback machine. It claims the links are available on the web, but it links back to
https://learn.openenergymonitor.org/electricity-monitoring/pulse-counting/files/pulseDecoder.zip etc
which then directs you to the Docs … which doesn’t have the information
And the link to Create LED pulse sensors following this ‘guide by AirSensor’ seems to lead to a clothes shop
… so beware!

This is one reason (“link rot”) why we strongly discourage contributors from linking to 3rd party sources for diagrams, photos, etc supporting their post, and normally insist that the material is hosted here.