AVR-DB: emonTx V4, new hardware in progress

Don’t you mean “without the 2nd & 3rd phase components”?

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I have an updated version of the expander on its way for testing. Firmware in progress (thanks to @Robert.Wall!) priority will be for the base board first, can’t quite give an ETA on the 12 CT version yet. But will keep you in mind if your keen to test an early version of all 12? Thanks for the interest!

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Definitely keen on getting early access to test the new hardware/firmware :+1:t2:

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Yes that’s right!

Great cheers @warrenashcroft

@Robert.Wall Thanks for the link

To solve my Kicad problems, I found I had made a silly mistake when downloading the github .sch files, as I downloaded the files individually. When I downloaded the zip file from github using the green ‘code’ button and extracted the files, Kicad imported them without any problem. So problem fixed!

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How are you getting stock of the RFM69CW? :hushed:

We have had good stock of these since before the current shortage.

The PCB prototypes for the emonPi and rfm69pi designs I mentioned above have arrived and I’ve had a chance to complete the assembly, here are a couple of pictures of what these look like:

EmonPi v2.0
This would fit inside a Lincoln Binns U-case with acrylic fascias:
Electronics Case - U-Case Range | Lincoln Binns Ltd

RFM69Pi - Terminal block option

RFM69Pi - CT jack sockets and voltage sensing option

The next step is to do work on firmware and testing of enclosures for these.

Looks good :+1:

Is it still open source hardware?

Thanks @nchaveiro, yes all open source, see post 94 above :slight_smile:

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Another progress update.

Robert Wall developed a new set of firmwares for the EmonTx v3 and emonPi, published last year (see forum post here). I’ve adapted these firmwares to run on the EmonTx4 and emonPi2 providing continuous monitoring + native RFM69 radio support on the new hardware and uploaded the firmwares to the emonTx4 and emonPi2 github repositories. There is also a short guide in each repository on setting up the Arduino IDE, downloading the right libraries and setting the compilation settings.

See the guide for the emonPi2 here
emonpi2/firmware at main · openenergymonitor/emonpi2 · GitHub

and the guide for the emonTx4 here:
emontx4/firmware at main · openenergymonitor/emontx4 · GitHub

The OLED display firmware for the emonPi2 is coming together nicely. Here’s a picture of it running on one of the RFM69Pi boards I mentioned above. You can do much more than this with these display’s of course but it can at least do the same as the original emonPi LCD so far.

emonPiLCD script code changes required:
Comparing master...emonpi2lcd · openenergymonitor/emonpi · GitHub

We have also been building up more systems for ongoing development and testing.

We are still waiting on another quote for the EmonTx4 and emonVS manufacture and will hopefully update on that soon.


please sir!,… any updates…

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Hello @diyhouse

We are running behind on our original estimate, it is now looking like we will have stock of the EmonTx v4 and emonVs, towards the middle of September (approx 6 weeks time). I can also now share what we expect the pricing will be.

The price for the EmonTx v4 looks like it’s going to be £66.25 ex VAT (£79.50 inc VAT). That’s with quite a tight margin with the way costs have been rising across the board. It’s a little more than the current emonTx v3 but with quite a bit more functionality.

emonVs, the precision voltage sensor and power supply is looking like it will be ~£54-59 ex VAT (£65-70 inc VAT) for the single phase version, ~£63 ex VAT (£75.6 inc VAT) for the 3 phase version. This provides a much more accurate voltage reading than the AC adapter’s that we have been using, though unfortunately at a higher price. This is something we will continue to look at over time to see how we can reduce the cost, perhaps with alternative options such as an adapter board for the original AC adapter.

Edit: As a package the EmonTx v4 + EmonVs voltage sensor looks to be about £125 ex VAT (£150 inc VAT) with CT sensors and an emonBase basestation on top of that - or the WiFi option when that becomes available.

@TrystanLea am I right that the V4 needs the emonV?

If so, I’d suggest it would be better to advertise this as a package, rather than as this plus this. Also for retail, you should really quote a VAT inc price :slight_smile:

At that price point, is this an RFM Unit that could be connected via the serial port?

How much for the ESP32 and LCD board?

Thanks @borpin , yes the emonTx v4 does need emonVs, it probably does make sense for it to be a package as you suggest. Yes good point re inc VAT, the thought was that not all of our customers are UK customers though its usually best to quote both prices, I will amend.

Yes it is an RFM unit that can also be connected via the USB C port to a RaspberryPi, is that what you mean?

Still a bit further off on the ESP32 + LCD board, emonPi v2 and the CT extension board. Focus in recent weeks has been on the emonPi v2 and end-to-end system testing, alongside trying to work through a packet loss issue with the RFM69 radio’s.

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Does it make any commercial sense to offer a version without the RFM Chip & Antenna port? I can see a lot of folks using the V4 without wanting the additional cost of an emonBase as well. TBH, unless you are using an emonTH, it makes little sense to pay for a base. If you have multiple units even less so.

Personally, I think the TH has had it’s day with plenty of battery BLE sensors around that are far cheaper.

I think Wi-Fi for the V4 should be the default comms method with RFM as backward compatibility.

Thanks @borpin it’s a good point re rfm options. We have offered no-RF variants in the past, but it is difficult to gauge demand for each variant for manufacture. We are however planning to place greater emphasis on using USB for direct connection between the emontx and a Pi based base station in the setup guides.

The ESP WiFi is great for remote server connected systems but less advantageous for those keen on local data storage. Emoncms.org has its own costs of course, which typically makes local storage cheaper long term especially for complex systems with lots of feeds.