Domoticz

Hi everyone,

I launched myself into a home automation project in which I wanted to integrate a lux sensor to control the lights intensity via Domoticz.

So I flashed an ESP8266 with ESPEasy and connected a GL5528 like so : wiring 3,3V to A0 through a 1KOhm resistor and the GL5528 from A0 to GND.

When I look at the web interface (configured as Analog Input : Internal), I got a steady value of 65535. Whatever I do, it's not moving.

I first thought it was the resistor which was too low, so I changed it for a 4,7K then a 47K resistor without sucess. Still the same steady value ... I also replaced the GL5528 just in case.

Then I red on the wiki that ESP8266 NodeMCU already had a pullup/down resistor, so I replaced the 47K with a wire. Still, nothing has changed !

I'm coming out of ideas, so if you have any informations that could help me troubleshoot this !

Thank you in advance

you will most likely have better response if you ask this on the espeasy forum

here: https://www.letscontrolit.com/forum/

Shouldn't that be wired like shown in this example?:
https://www.hackster.io/gary-watts/esp8 ... schematics
Jos

I build a LUX sensor with ESP8266 (standard software ) and Lux sensor BH1750, no use of resistors.
ESP8266 send his data to Domoticz, with a Blockly I manage the darkness in the living room. It works flawlessly.

This was the test setup.

A photocell is something different from the BH1750, which works quite different. The photocell is simply a resistor which varies based on the light. That is why you need the 3.3v - LDR - a0 pin - fixed resistor - 0. The a0 wil get a variable Volt level based on the resistance of the LDR.
Agree that the BH1750 works "better" but I have both and it should also work when no accuracy is required.

Jos

Hi Jos, I know the difference. I’m using the LDR as well as shown. It allows the sunscreen to go out.
The topic starter was talking about lux, so I responded with my build to show it can be very simpel, accurate and cheap


With regards,

Evert

jvdz wrote: Sunday 23 May 2021 20:39 Shouldn't that be wired like shown in this example?:
https://www.hackster.io/gary-watts/esp8 ... schematics
Jos

Yup, it's what I did, sorry, I messed myself when writing ...

erem wrote: Sunday 23 May 2021 20:06 you will most likely have better response if you ask this on the espeasy forum

here: https://www.letscontrolit.com/forum/

Thanks for the link of the forum, I tried to post on the ESP reddit but got insta moderated for no reasons

I originally bought photocells to reduce cost at maximum since I already had resistors, but now I'm considering buying an I2C BH1750 !

I'll try posting on the ESP forum, I don't like to stay on a unexplained failure ...

Thank you for the quick answers

I'm back with an answer from the ESP forum. Apparently, if the firmware contains VCC in its name, then the A0 input doesn't work quite fine. I changed mine and it's now working just perfect with a 10KOhm resistor. (ESP_Easy_mega_20210503_test_A_ESP8266_4M1M.bin : name of the firmware used)