# Don't know how to use pcf8574 cluster node

**URL:** <https://discourse.nodered.org/t/dont-know-how-to-use-pcf8574-cluster-node/25992>\
**Category:** General\
**Created:** [3 May 2020 13:00 UTC](https://discourse.nodered.org/t/dont-know-how-to-use-pcf8574-cluster-node/25992 "2020-05-03T13:00:04Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![Kiwi\_gamer01](https://avatars.discourse-cdn.com/v4/letter/k/a587f6/32.png) [@Kiwi\_gamer01](https://discourse.nodered.org/u/Kiwi_gamer01)\
**Post date:** [3 May 2020 13:00 UTC](https://discourse.nodered.org/t/dont-know-how-to-use-pcf8574-cluster-node/25992/1 "2020-05-03T13:00:04Z")

</div>

In a python script i would write this:  
`bus.write_byte(0x20, 0x02)`  
to send a command to a pin of the expansion board(PCF8574).

How do you have to fill out the cluster node and the cluster configure to do the same?

---

<div class="post-metadata">

**Author:** ![zenofmud](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/zenofmud/32/316_2.png) [@zenofmud](https://discourse.nodered.org/u/zenofmud)\
**Post date:** [3 May 2020 13:09 UTC](https://discourse.nodered.org/t/dont-know-how-to-use-pcf8574-cluster-node/25992/2 "2020-05-03T13:09:19Z")

</div>

did you read the description on the [nodes page](https://flows.nodered.org/node/node-red-contrib-pcf8574-cluster)?

---

<div class="post-metadata">

**Author:** ![Kiwi\_gamer01](https://avatars.discourse-cdn.com/v4/letter/k/a587f6/32.png) [@Kiwi\_gamer01](https://discourse.nodered.org/u/Kiwi_gamer01)\
**Post date:** [3 May 2020 13:09 UTC](https://discourse.nodered.org/t/dont-know-how-to-use-pcf8574-cluster-node/25992/3 "2020-05-03T13:09:36Z")

</div>

of course but I don't understand them

---

<div class="post-metadata">

**Author:** ![zenofmud](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/zenofmud/32/316_2.png) [@zenofmud](https://discourse.nodered.org/u/zenofmud)\
**Post date:** [3 May 2020 13:11 UTC](https://discourse.nodered.org/t/dont-know-how-to-use-pcf8574-cluster-node/25992/4 "2020-05-03T13:11:06Z")

</div>

So what have you defined in the node?

EDIT: you may want to look at the issues on the node's [GitHub page](https://github.com/david-kasparov/node-red-contrib-pcf8574-cluster/issues), there seems to be some problems with it.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [2 July 2020 13:11 UTC](https://discourse.nodered.org/t/dont-know-how-to-use-pcf8574-cluster-node/25992/5 "2020-07-02T13:11:08Z")

</div>

This topic was automatically closed 60 days after the last reply. New replies are no longer allowed.