Wiring a normal relay with 2 way switches

Hardware
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1

Hello Everyone,
I am installing a esphome setup for the ground floor. I want to controll a banner light, motor, outside light and a corridor light. I have a standard relay module used with arduino.
The problem I am facing is the corridor light is hook up with a 2 way switch like this:

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I want to add relay switch on top of the existing wiring, i want to retain the functionalities of existing switches. Also I only have access of one of the switch because of the loaction of esp8266 and relay modules. Can this be done without removing one switch and replacing it with relay.

2

That is going to be difficult. Your existing wiring is the strangest 3-way switch connections that I have ever seen. And I’ve seen some weird ones. (In the US, this is called 3-way. Everywhere else it’s 2-way). In order for the original switches to work you have to get access to both switches and do some rewiring.

3

this is indeed the strangest way of a 2 way switch circuit, but it works tho.
if you can replace 1 switch with a intermediate switch and insert a 2 way relais into the mix, it’s doable, but you’ll need to rewire to the “normal” standard.

4

You should see the wiring in my home. All the switches are low voltage and use relays to turn the power on and off.

The house was built in the 80s and it was consider cost efficient because of the lower load level.

5

you’ll need to rewire like drawing below.
1st switch some wires to switch around, second switch replace with intermediate one and add relay behind the new switch.

wiring
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6

Thank you all for the quick reply.

The Wiring is embeded in the home so not possible to rewire it. I maybe able to remove one switch and replace it with a relay. Is there a way to do it non destructively?

BTW this is standard wiring in India

7

there is no need to rewire the embeded wiring in the wall, only in the switches you have to change the wires to another connection of the switch.
you’ll have only one wire left going to the light that you won’t need anymore.

8

Easiest way without rewiring anything is installing sonoff basic r4 on the light fixture and just link L1 & L2 terminals from either one of the switch

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9

This means he can’t control the light from the switches.

10

I think he still can, it’s based on the Sonoff Basic R4 “magic switch mode”

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11

Didn’t know of the magic switch mode. But after googling I understand

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Thanks for the different solutions.
The problem I have is that I can’t access the other switch and light fixture because of there position from the esp8266 that controlls all the ground floor. so the solution provided by @Krivatri Might be something i need to look into. I was hopeing to not add or remove anything and just add the relay in parallel just like we do for normal switches.