I would like a luminescence sensor whose output is lux, or something similar, to quantify the light level by the kitchen sink. I would like this sensor to be DC-powered, have Wifi output, and hopefully have some sample code showing how to integrate it with HA. I have done some on-line searching, but have not found anything useful. Please direct me – thanks!
You should look into a esphome with lux sensor
I use this and it works great.
I’ll be doing a write up of a BH1750 ESPHome Lux sensor next month when parts arrive. It’s pretty simple.
Thanks. I found this, but:
- The picture above does not match the one on the AdaFruit website
- I don’t see any mention of WiFi - am I missing something?
- No idea what “The I²C bus is required to be set up in your configuration” means. Is this hardware, software, or a combination of the two?
Tom_l - I look forward to your write-up
Lots of people make breakout boards for the BH1750. They all have the same connections though. For example I’m going to use this one:
The ESPHome project uses ESP32 or ESP8266 processor boards that have built in wifi. This is a component you have to set up in ESPHome:
There are some good recommendations for which ESP32 boards to order here: https://community.home-assistant.io/t/whats-your-favourite-esp32-board-best-good-cheap-quality-reliable/380023/
It’s a communications protocol the sensor uses to talk to the ESP board. So you have to set up that component too. See:
Okay - a bunch of reading to do. In a nutshell, I think you are saying to a) buy a BH1750 sensor, b) buy a EPS32 board, c) connect the sensor to the board using the I²C bus, and d) configure the device in HA. About correct?
Yep. And step (d) is very simple due to discovery.
I’m surprised there aren’t more off-the-shelf cheap battery operated sensors for lux.
Some of the Xiaomi/Aqara motion sensors “almost” do it…
I saw this one pop up a while back and thought it was filling a decent market gap, but it looks like it may have been discontinued.
I find I often want lux sensors located where wired power isn’t that practical.
I think a BLE solution which could be bridged by ESPHome would be nice.
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I even got one of these a while back to tinker with, but didn’t get too far.
AU $20.40 15%OFF | NRF51802 Bluetooth 4.0 BLE SOC Temperature Atmospheric Pressure Acceleration Sensor Module Gyroscope Light Sensor MPU6050 AP3216
As a battery powered device the Xiaomi sensor may not update update fast enough for continuous lighting control, but it is supposed to be a good sensor from what I’ve heard.
By “Continuous” I mean LUX → some equation → brightness level for lights. Not just a night / day set point. It would be fine for that.
If you go down the ESPHOME route (which is a very good option), the other thing you should ask yourself is “what other sensors should I tack on to the esp while I’m doing this?”.
Marginal cost/effort of throwing on temp, humidity, motion, proximity, buttons, you-name-it is quite small…
Maybe add some ble presence detection.
The world is your oyster;)
Search for “ESPHOME multisensor” or similar…
Hate to admit this, but I need some more hand-holding… I now have both a BH1750 and a HiLetgo NodeMCU. Connecting to each other seems simple, see ESP8266 NodeMCU with BH1750 Ambient Light Sensor | Random Nerd Tutorials. However, I am not sure what I need to do to the NodeMCU so that it can be detected by my current HA system as a device. Please point to to the appropriate write-up, thanks!
My parts have arrived in the country so unless customs drag their feet I should be writing this up next weekend.
Did you ever get around to the write-up?
Have not yet done a write because the project is not yet done. I got the thing working with AC power, but ran into a challenge with the battery I ordered. I suspect it is simply a connectivity issue and I need to get back to it.
- LOLIN (Wemos) D1 Mini ESP8266 v4.0.0
- LOLIN BH1750 ambient light shield for Wemos D1 Mini
- Soldering iron
- Thin/fine electronics solder
- USB-A to USB-C cable
ESPHome YAML code:
- ssid: !secret
- platform: bh1750
name: "BH1750 luminance"