4ch relay board

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joel gerardi

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Apr 22, 2026, 7:48:26 PMApr 22
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I just bought the board in the link below on amazon.  There is no documentation so i have no way of setting up tasmota.  I need to know the IO assignments for the relays.  Anyone know how i can figure that out?

Philip Knowles

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Apr 23, 2026, 5:12:05 AMApr 23
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Possibly this one?

From: sonof...@googlegroups.com <sonof...@googlegroups.com> on behalf of joel gerardi <joelg...@gmail.com>
Sent: 23 April 2026 00:48
To: TasmotaUsers <sonof...@googlegroups.com>
Subject: 4ch relay board
 
I just bought the board in the link below on amazon.  There is no documentation so i have no way of setting up tasmota.  I need to know the IO assignments for the relays.  Anyone know how i can figure that out?

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joel gerardi

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Apr 25, 2026, 8:10:08 AMApr 25
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That is not working at all.  In fact when i copy that template and save it,, the relay board reboots and the template isnt saved.  If i enter the template setting manually they save but then only one toggle button shows on my main screen and that button doesnt do anything.

JG

Jéro

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Apr 26, 2026, 12:25:17 PMApr 26
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Hello, i use a same one

try this conf, it's should works




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joel gerardi

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Apr 27, 2026, 12:49:09 PMApr 27
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Still doesnt appear to be working.  Attached are the main menu, module setup page and the template page.  Clicking the buttons does not do anything.  I was able to get a sechematic of the board and that is attached as well.
Screenshot 2026-04-27 at 12.43.04 PM.pngScreenshot 2026-04-27 at 12.42.46 PM.pngScreenshot 2026-04-27 at 12.42.27 PM.png

ESP12F_Relay_30A X4.pdf

Philip Knowles

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Apr 28, 2026, 3:55:30 AMApr 28
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Start with getting the relays to work from the UI (GPIO12-14, 16). The only button (on the board) which is going to do anything is PB2 (on GPIO4). Set that as Button 1. Any other buttons will need to be external ones connected to the headers.

Sent: Monday, April 27, 2026 5:49:09 PM
To: TasmotaUsers <sonof...@googlegroups.com>
Subject: Re: 4ch relay board
 

joel gerardi

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Apr 28, 2026, 10:38:11 AMApr 28
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Solved
This board does not come with any documentation at all.  I was able to get the schematic by emailing the vendor. After looking at all of that and trying anything i could think of i was begining to the think that the board might be bad.  This board comes with all of the headers unsoldered.  In order to flash it I only soldered the ones that i needed.  Then i looked at the board itself closely and it is labeled.  Aparently the relays are not wired to the chip directly.  There is a double header that needs to be soldered on and then you have to add jumpers in order to make the actual connection.

Screenshot 2026-04-28 at 10.36.36 AM.png

Philip Knowles

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Apr 29, 2026, 8:20:58 AMApr 29
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In that case don't connect RY1 to GPIO16 as you will get strange effects as it goes high on boot - perhaps a jumper lead from GPIO15?
Sent: 28 April 2026 15:38
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