I check the Redox production of the salt electrolyser in my pool

Objective

On my salt electrolyser, I have a blue LED that indicates that production is ongoing, if it goes out, I would like my home automation system (Jeedom or Home Assistant) to know to warn me.

I was not going to disassemble the electrolyser to recover a power supply or not from the LED, even if I was itchy, I looked at how to recover rather the ‘visual’ info of the LED on or off.

My idea was to find out if there was a brightness detector, which was simple to interface on my computer. Existing control management system for my pool. My system using an I2C port, I looked for this type of chip and it had to be interfacing on Esp Easy for simplicity.

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Flash the Sonoff 4CH Pro R2 (or 4CH Pro R3) with ESP Easy

I just received the 4CH Pro R2, version R2 changes the implementation of the ESP8285 chip, the method for detecting the pin 15 (to find GPIO0) changes slightly, this tutorial to save you time.

Note: 21/02/2021 : I have since tested the 4CH Pro R3, I was going to make a tutorial page for its programming. It is ultimately simpler than the R2, Sonoff learned from his mistakes and put the GPIO0 back on the button (oufff).

I did not make a tutorial page because I found a very clear and well done tutorial on the Fobul - Domotics page. Congratulations to him, go to his page and take a look at his blog.

For flashing, I used ESP_Easy_mega_20210114_normal_ESP8285_1M.bin

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