Home Assistant Glow 🌟

During my internship at Nabu Casa in the first half of 2021, I focused on energy management in homes and how to collect all energy data and display it on a dashboard. From core release 2021.8 you can now also get started with the energy dashboard in Home Assistant!

CLICK HERE! To see the Home Assistant Glow in action.

Home Assistant Glow makes a (not so) smart meter without a P1 port easily readable, reading the pulse LED that is always present in most cases and it works with ESPHome! To neatly hide it all in your meter cupboard, a case has been designed that you can 3D print yourself.

How do I know if my meter is supported?

To make sure your meter will work with the Home Assistant Glow, you have to look for the imp/kWh rate (see picture). Note the value, because it will be of importance at a later stage to configure the .yaml file.

Hardware

First, fill your 🛒 or see if you already have the components below.

ESP32
Dupont Jumpers
3D printed case (see the case folder)
Photodiode - Banggood or AliExpress (make sure that you do not accidentally order or receive an LDR)
LED RGB 5mm 4 pin - kathode

Diagrams

How everything is connected together.

Photodiode

PHOTODIODE	ESP32	D1 mini / ESP8266
A0	NOT USING	NOT USING
DO	D12 (GPIO12)	D6 (GPIO12)
VCC	3V3	3V3
GND	GND	GND

For problems with the measurements, see the FAQ part further down.

LED

How the status led is connected to the ESP32. For each measured pulse, the LED will briefly flash red and in case of no WiFi connection, the LED will continue to flash blue.

LED	ESP32	D1 mini / ESP8266
RED	D2 (GPIO2)	D4 (GPIO2)
GREEN	D4 (GPIO4)	D2 (GPIO4)
BLUE	D5 (GPIO5)	D1 (GPIO5)
GND	GND	GND

Get started

Once you are done connecting all the hardware, we'll get started with the configuration for ESPHome. In this repository you will find the file home_assistant_glow.yaml, which you can copy into the esphome folder of your Home Assistant config. Adjust the value pulse_rate under substitutions to the value on your meter (how do I find my imp/kWh rate?), by default the value is 1000 in the yaml file. Finally go through the installation wizard of ESPHome and flash the ESP32/8266.

FAQ

Anwers to some of the most frequently asked questions:

Wrong soldered diode

Issue: #34

A number of users have reported receiving the recommended diode board from various sources, only to find the diode has been soldered to the board the wrong way round. This can cause that your pulse LED is not measured regardless of the sensitivity you set for the diode.

The large triangular part of the diode, should be soldered to the positive side of the board not the negative. If yours is orientated as above, you should desolder the photodiode invert it and resolder so the larger triangular part of the diode is connected to positive.

License

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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