How to add WiFi to emonTx

qm3ster · 2021-09-08T15:36:44.953Z

Hi, first post UwU.
I want to run my own server in docker on the lan, and run around the house measuring 3-phase consumption in different locations.
So, little interest in 433Mhz.
If I source my own Adafruit HUZZAH ESP8266 Breakout or similar, how do I add it to a emonTx?
(The preinstalled version is not in stock at the shop)
I do have usb uart dongles.
Additionally, will the 3 X AA Battery Holder be able to power it:

in conjunction with a voltage sensing supply?
in a voltage-less configuration?

Robert.Wall · 2021-09-08T21:56:44.094Z

Welcome to the OEM forum.

You can either add it on the outside, as the original prototype (that’s before provision was made on the PCB of the emonTx to mount it in place of the battery holder), or if your emonTx has the second FTDI connector in the centre of the PCB, then you can have it inside the case.

The original instructions, including the software download, are here:

Using the EmonTx v3 with the ESP8266 Huzzah WIFI module Labs

Following on from the forum post here ESP8266 Wifi Developments. This is a brief guide on how to use the Adafruit ESP8266 Huzzah WIFI breakout module with an EmonTx v3 to make a simple WIFI enabled energy monitor that posts to a remote emoncms server such as emoncms.org. Note: this is an ongoing development project, but is a useful option in its present form [image] In the future, we may integrate the ESP8266 module directly on the EmonTx PCB. For now, the ESP8266 Huzzah module provides a go…

CAREFULLY NOTE that the emonTx sends its data on the Rx pin (i.e. the pin marked “Rx” is looking for the Rx pin on the ESP) and it must not receive any data from the ESP. If it does, unwanted characters sent at startup can reconfigure the emonTx in an unpredictable way.
You will need a programmer (a) to load the ESP software and (b) if you need to change the sketch.

qm3ster:

Additionally, will the 3 X AA Battery Holder be able to power it:

in conjunction with a voltage sensing supply?

in a voltage-less configuration?

There are several issues here.
You will probably need high power rechargeable cells if you do try to operate on battery power, for permanent installation we recommend a 5 V USB supply, because battery life would be extremely short, and the a.c. adapter cannot provide sufficient current without seriously distorting the wave you are tying to measure (so it is current-limited and the emonTx will crash if you try it).
If you want “voltage-less”, you cannot use the 3-phase sketch, because it phase locks to the a.c. voltage in order to measure real power across the three phases. You must use the standard single-phase sketch and measure only current, and allow the sketch to calculate a ‘best guess’ apparent power based on an assumed voltage.

qm3ster · 2022-01-18T23:39:58.437Z

I have received my items, (they were stuck in Cyprus customs at the airport for over 2 months)
I am getting these types of measurements:

MSG	633
Vrms	246.14 V
P1	148 W
P2	-112 W
P3	-96 W
P4	46 W
E1	276 Wh
E2	-259 Wh
E3	-130 Wh
E4	90 Wh
pulse	1

Is just logging data from P1-4 and Vrms enough to calculate true power?
Or is there a different firmware I need to flash to the emonTx (not the ESP8266) to calculate that in real time instead?

I see I need to flash 3-Phase firmware

Robert.Wall · 2022-01-19T00:07:18.304Z

qm3ster:

I see I need to flash 3-Phase firmware

That looks to be the case, as you do indeed have a voltage to provide the information necessary to calculate real power. If you download if from the forum, it comes in a zip file with full written instructions in a pdf file.

Update to 3-Phase PLL sketch emonTx

An updated version of this sketch is attached here, correcting a minor problem with reading the configuration under certain conditions, and the two previous issues showed the wrong version number. MD5 Hashes: emonTx_3Phase_PLL_V1.7.zip 067e98e295c9c2fcd14f31c784f5183a emonTx_3Phase_PLL.ino a1208c832e132b00087b69b593bc785b config.ino 678e7b2a2514a4068ab6d45bb576ae74 rfm.ino b830300d088943a64a4b54ee92e8e4a0 emonTx 3-phase PLL User Doc.pdf 00f2ccc51c5d4452e9d7a94ab6b9c547 emonT…

You will want to disable the radio as you’re using WiFi, so the choice of “classic” or “Native” format does not concern you.

borpin · 2022-01-19T09:14:49.547Z

qm3ster:

If I source my own Adafruit HUZZAH ESP8266 Breakout or similar, how do I add it to a emonTx?

Have a search for PiZeroW - I favour connecting up EmonTX via a PiZero to read the serial data. There are quite a few discussions on how to do that. Other suggestions include a Serial to Ethernet adapter as well.

qm3ster:

Additionally, will the 3 X AA Battery Holder be able to power it:

I’d suggest not.

Robert.Wall · 2022-01-19T10:34:48.868Z

borpin:

I’d suggest not.

I’d say almost certainly not - unless you only want it to operate for maybe a day - Current consumption analytics on ESP8266 for battery users - Everything ESP8266 says “in my experience a typical 2500mA AAx3 will give you approx 30hours of continuous service.” and that’s reduced by the power consumption of the emonTx itself.

borpin · 2022-01-19T10:40:12.360Z

Well it will work, just not for very long

qm3ster · 2022-01-19T14:28:43.041Z

Yeah, I’m doing USB AC adapter power, don’t worry guize.

qm3ster · 2022-01-19T22:26:21.377Z

It’s taking place!
Occuring, one might even say!

Flashing emonTx via emonESP Getting Started

Finally got everything working, and I’m getting measurements of the type k v ct1 -40.66 ct2 -93.04 ct3 0.02 ct4 -45.55 vrms 244.95 … I wonder what any of that means xD Especially, who is ct4, when that’s the neutral.