Controlling relays 30m away with ESP module - how to connect?

Question

Hello I need to control via ESP module relays that are about 30m away from the ESP , I have such modules as shown in the pictures and I am combining but it does not want to work . Can someone tell me how to connect this?

madamsz1 · Answer

Draw how you clip it together, because here you have two modules separating, one at the relays (opto) and the other on the green boards.

kindlar · Answer

What voltage drop do you have over this distance?

PawelJuszczak · Answer

From the ESP I connect GND and GPIO to the green board, and from the green board I connect GND and IN1 to the relay, and 5V power from the USB charger.

Anonymous · Answer

30m is a lot for 3.3V you have to change the concepts.

ArturAVS · Answer

. And do you know how to draw diagrams? One diagram will explain more than a thousand words. Not a tragedy, I used to do about 70m on 5V. Although it is actually better to change the concept.

madamsz1 · Answer

A bit too far for this way of working and connecting. Strengthening the line (power) between the relays and the "green board" will probably solve the problem. However, you need to change the concept.
Probably it is the control of some gate ? gate ? If so, it might be easier regarding access to the 12/24V power supply

PawelJuszczak · Answer

It's about the control of the solenoid valves, I'm willing to change the concept but I don't know to which one, currently what I have is 230V in the place where the solenoid valves are, relays and 24V power supply and a twisted pair of wires to another place where I have WiFi and it's from there I want to control these valves with ESP

Added after 1 [hour] 16 [minutes]: .

I tried it like this

I tried it like this.

kindlar · Answer

. If he can tolerate that voltage, why not give 24V to the signal transmix?

PawelJuszczak · Answer

In the description of the relay module, it says that control is by 5v or 3.3v

kindlar · Answer

There I think is an opto-isolation on the signal transmission side, I guess there can be more voltage that the circuit can tolerate. The relay is another step and another signal.
Give a link to the description.

PawelJuszczak · Answer

I've just managed to find this great product on the AliExpress platform, check it out!£13.91 | 3.3V 5V 3 relay module 5mA with optocoupler isolation compatible signal

Anonymous · Answer

I would leave the boards, I would supply 5V to the relay module itself, but I would supply the 24V signal lines with a power conversion resistor so that the diode in the transmitting optoisolator had 5mA. What you need there is a 24V power supply + 24>5V converter stabiliser.

PawelJuszczak · Answer

And the idea came to me that this module with relays should be next to the ESP, and the twisted pair should be used to supply 24V to the solenoid valves. The only thing is whether I can apply this voltage to the twisted pair and whether there won't be a voltage drop over 30 metres

madamsz1 · Answer

. There will probably be a voltage drop by the resistance of the wires. Valves need some current so a power source is good to give near them and amplify the control signal. Stranded wire is also poorly suited for high current control, you would have to connect the wires in multiples.

PawelJuszczak · Answer

And how to amplify such a control signal? The ESP outputs 3.3v and this would have to go in a twisted pair to the relays and there would certainly be a drop.

Anonymous · Answer

I wrote to you above

PawelJuszczak · Answer

I have a 24V power supply at the solenoid valves but how do I connect it all?

Anonymous · Answer

OK, I know what's going on, it may work on 5V as you assumed, only in module 817 you have to remove the jumpers and change the resistor underneath them there is a value of 3kOhm to something very smaller from the calculations for the diode I suspect that even a "0" Ohm resistor will short circuit and it will work.

And wire it differently but give original pictures of yours as there are different versions.

PawelJuszczak · Answer

I am sending a picture of the module

Anonymous · Answer

and relays?

PawelJuszczak · Answer

Please .

Anonymous · Answer

Check with an ohmmeter that GND is the same as RGND

Added after 7 [minutes]:

According to the description this is how you should connect although I don't know how it is with gnd and rgnd

Of course after removing the jumper and and removing the resistor. And be careful because such a connection in case of a short circuit at the output of the 817 module will heat up the optoisolator just as you put the jumper in.

Controlling relays 30m away with ESP module - how to connect?

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