# How to fill out pcf8574 cluster nodes?
**URL:** https://discourse.nodered.org/t/how-to-fill-out-pcf8574-cluster-nodes/26119
**Category:** General
**Created:** [5 May 2020 07:43 UTC](https://discourse.nodered.org/t/how-to-fill-out-pcf8574-cluster-nodes/26119 "2020-05-05T07:43:50Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Kiwi\_gamer01](https://discourse.nodered.org/u/Kiwi_gamer01)
#### Post date: [5 May 2020 07:43 UTC](https://discourse.nodered.org/t/how-to-fill-out-pcf8574-cluster-nodes/26119/1 "2020-05-05T07:43:50Z")
I don't understand how to fill out the cluster nodes and the clusterconfiguration.
I read the node description but i don't understand it.
I am using an pcf8574 extention board with the adress 0x01.
Can someone give me an cluster in and out example for the adress 0x021 and discribe what i had to type in the pin field and what are interupts in this sense?
> **[node-red-contrib-pcf8574-cluster](https://flows.nodered.org/node/node-red-contrib-pcf8574-cluster)**
>
> Control each pin of a PCF8574/PCF8574A/PCF8574P I2C port expander IC with Node-RED ( ).
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### Author:  [@kuema](https://discourse.nodered.org/u/kuema)
#### Post date: [5 May 2020 07:49 UTC](https://discourse.nodered.org/t/how-to-fill-out-pcf8574-cluster-nodes/26119/2 "2020-05-05T07:49:29Z")
I think it would be helpful for others if you mentioned the custom node you are referring to (better even provide a link to NPM or the library to save others time) and a part of your flow/screenshots. 😀
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### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [4 July 2020 07:49 UTC](https://discourse.nodered.org/t/how-to-fill-out-pcf8574-cluster-nodes/26119/3 "2020-07-04T07:49:30Z")
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