# Relay and IN coupling on SunFounder 5V 8 Channel Relay
**URL:** https://forum.sunfounder.com/t/relay-and-in-coupling-on-sunfounder-5v-8-channel-relay/1560
**Category:** General
**Created:** [August 26, 2024, 2:09pm UTC](https://forum.sunfounder.com/t/relay-and-in-coupling-on-sunfounder-5v-8-channel-relay/1560 "2024-08-26T14:09:08Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@anttiryt](https://forum.sunfounder.com/u/anttiryt)
#### Post date: [August 26, 2024, 2:09pm UTC](https://forum.sunfounder.com/t/relay-and-in-coupling-on-sunfounder-5v-8-channel-relay/1560/1 "2024-08-26T14:09:08Z")
Hello there,
would it be possible to take some stance on which IN goes to which relay.
The document doesn’t say much
> **[TS0012%20DATASHEET.pdf](https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/2522/TS0012%20DATASHEET.pdf)**
>
> 1295.62 KB
thank you
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### Author:  [@SunFounder\_Moderator](https://forum.sunfounder.com/u/SunFounder_Moderator)
#### Post date: [August 27, 2024, 6:37am UTC](https://forum.sunfounder.com/t/relay-and-in-coupling-on-sunfounder-5v-8-channel-relay/1560/2 "2024-08-27T06:37:19Z")
Please refer to:
[http://wiki.sunfounder.cc/index.php?title=8\_Channel\_5V\_Relay\_Module](http://wiki.sunfounder.cc/index.php?title=8_Channel_5V_Relay_Module)
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### Author:  [@anttiryt](https://forum.sunfounder.com/u/anttiryt)
#### Post date: [August 28, 2024, 12:03pm UTC](https://forum.sunfounder.com/t/relay-and-in-coupling-on-sunfounder-5v-8-channel-relay/1560/3 "2024-08-28T12:03:38Z")
Thank you
I still see the same problem here.
Yes, IN1 goes to Relay1.
But WHAT is the Relay1? The lastone? on which end?
If possible add a number to the picture depicting correct number 1 and 8
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### Author:  [@SunFounder\_Moderator](https://forum.sunfounder.com/u/SunFounder_Moderator)
#### Post date: [August 29, 2024, 2:59am UTC](https://forum.sunfounder.com/t/relay-and-in-coupling-on-sunfounder-5v-8-channel-relay/1560/4 "2024-08-29T02:59:12Z")
Relay1 is the K1 terminal, which is used to control the input signal for the first relay. Specifically:
Low-level trigger: When IN1 receives a low-level signal (typically 0V), the first relay is activated (closed), allowing current to pass through.
High-level signal: When IN1 receives a high-level signal (typically 5V), the first relay will open, stopping the current flow.
Similarly, Relay8 corresponds to the K8 terminal.
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### Author:  [@anttiryt](https://forum.sunfounder.com/u/anttiryt)
#### Post date: [August 29, 2024, 8:23am UTC](https://forum.sunfounder.com/t/relay-and-in-coupling-on-sunfounder-5v-8-channel-relay/1560/5 "2024-08-29T08:23:39Z")
Thank you.
Where in the board is K1 terminal? Which one of the blue boxes? There is no numbering in the blue boxes.
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### Author:  [@SunFounder\_Moderator](https://forum.sunfounder.com/u/SunFounder_Moderator)
#### Post date: [August 29, 2024, 10:25am UTC](https://forum.sunfounder.com/t/relay-and-in-coupling-on-sunfounder-5v-8-channel-relay/1560/6 "2024-08-29T10:25:58Z")
