Staircase switch project on ESPHome. AC 230V light circuit with two stair switches. Access is only to the box marked with the white square. I want to replace one stair switch with a bistable relay, the other switch is to stay as it is. How do I do the detection that the light is on? I am...

The ACS712 has a sensitivity of 100mV/1A which in the case of lighting a 10W LED bulb will give about 4mV, for the esp12 this will be 40 ADC units it will be hard to capture this programmatically without an amplifier in addition.

I was considering a comparator and only from the comparator to the ESP32. If anyone has a suggestion for another sensor or any other concept for the aforementioned problem then my ears are humbly open. .

I would test the difference between the outputs, then the ace would be eliminated and the voltage would be tested, i.e. an ordinary optoisolator of some kind, between the outputs when the bulb is switched off, there would be a potential of 300V DC as in the case of an led bulb or 230V AC as in the case of a traditional bulb. The only thing I don't know is how an LED bulb would behave if there was current between the outputs when it was switched off, or if it would sometimes flicker.

@jarzabek666 Develop your thought, because I don't get where and how you want to measure voltage.

Similar solution to switches with backlight. However, your idea still remains, but to make the current detection on the optoisolator this will give a minimum number of elements. But this circuit also has the disadvantage that the minimum current must be above 30mA to work.... .

By the way, the ACS712 comes in several versions. The 5A version has 800mV/A.

ESPHome Staircase Switch Project: Light-On Detection with ACS712 Sensor

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#1 21079877 12 May 2024 21:17

exey exey

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Post #1
21079877 12 May 2024 21:17

Staircase switch project on ESPHome. AC 230V light circuit with two stair switches.

Access is only to the box marked with the white square. I want to replace one stair switch with a bistable relay, the other switch is to stay as it is.
How do I do the detection that the light is on? I am considering a current sensor (e.g. ACS712) between the power source and the bi-stable relay.
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#2 21080029 12 May 2024 22:55

Anonymous Anonymous

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Post #2
21080029 12 May 2024 22:55

The ACS712 has a sensitivity of 100mV/1A which in the case of lighting a 10W LED bulb will give about 4mV, for the esp12 this will be 40 ADC units it will be hard to capture this programmatically without an amplifier in addition.
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#3 21081074 13 May 2024 18:21

exey exey

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Post #3
21081074 13 May 2024 18:21

I was considering a comparator and only from the comparator to the ESP32.
If anyone has a suggestion for another sensor or any other concept for the aforementioned problem then my ears are humbly open. .
#4 21081108 13 May 2024 18:39

Anonymous Anonymous

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Post #4
21081108 13 May 2024 18:39

I would test the difference between the outputs, then the ace would be eliminated and the voltage would be tested, i.e. an ordinary optoisolator of some kind, between the outputs when the bulb is switched off, there would be a potential of 300V DC as in the case of an led bulb or 230V AC as in the case of a traditional bulb. The only thing I don't know is how an LED bulb would behave if there was current between the outputs when it was switched off, or if it would sometimes flicker.
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#5 21081557 14 May 2024 01:05

exey exey

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Post #5
21081557 14 May 2024 01:05

@jarzabek666
Develop your thought, because I don't get where and how you want to measure voltage.
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#6 21081576 14 May 2024 05:32

Anonymous Anonymous

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Post #6
21081576 14 May 2024 05:32

Similar solution to switches with backlight.
However, your idea still remains, but to make the current detection on the optoisolator this will give a minimum number of elements. But this circuit also has the disadvantage that the minimum current must be above 30mA to work....

.
#7 21082365 14 May 2024 19:51

exey exey

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Post #7
21082365 14 May 2024 19:51

By the way, the ACS712 comes in several versions. The 5A version has 800mV/A.
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Topic summary

The discussion revolves around implementing a staircase switch project using ESPHome, focusing on light-on detection with an ACS712 current sensor. The user aims to replace one stair switch with a bistable relay while keeping the other switch unchanged. Concerns were raised about the ACS712's sensitivity, particularly when detecting low currents from LED bulbs, which may require an amplifier for accurate readings. Suggestions included using a comparator to interface with the ESP32 and exploring optoisolators for current detection. The ACS712's different versions, such as the 5A variant, were also mentioned, highlighting their varying output characteristics.
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ESPHome Staircase Switch Project: Light-On Detection with ACS712 Sensor

ESPHome Staircase Switch Project: Light-On Detection with ACS712 Sensor

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