# Trigger the send smd node when a gpio pin status changes
**URL:** https://discourse.nodered.org/t/trigger-the-send-smd-node-when-a-gpio-pin-status-changes/19150
**Category:** General
**Created:** [14 December 2019 14:52 UTC](https://discourse.nodered.org/t/trigger-the-send-smd-node-when-a-gpio-pin-status-changes/19150 "2019-12-14T14:52:10Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@lodv](https://discourse.nodered.org/u/lodv)
#### Post date: [14 December 2019 14:52 UTC](https://discourse.nodered.org/t/trigger-the-send-smd-node-when-a-gpio-pin-status-changes/19150/1 "2019-12-14T14:52:10Z")
Hi,
I want to send a sms with the nexmo send-sms node when the status of a GPIO pin changes from high to low. I have no idea how I can trigger the node.
I hope somebody can help me with a solution.
Thank you.
Yvonne
---
### Author:  [@ghayne](https://discourse.nodered.org/u/ghayne)
#### Post date: [14 December 2019 17:03 UTC](https://discourse.nodered.org/t/trigger-the-send-smd-node-when-a-gpio-pin-status-changes/19150/2 "2019-12-14T17:03:33Z")
To avoid confusion you should delete this post as you posted twice and the other post has been answered!
---
### Author:  [@dceejay](https://discourse.nodered.org/u/dceejay)
#### Post date: [14 December 2019 17:17 UTC](https://discourse.nodered.org/t/trigger-the-send-smd-node-when-a-gpio-pin-status-changes/19150/3 "2019-12-14T17:17:26Z")
I'll lock it to avoid confusion.
---
### Author:  [@dceejay](https://discourse.nodered.org/u/dceejay)
#### Post date: [14 December 2019 17:17 UTC](https://discourse.nodered.org/t/trigger-the-send-smd-node-when-a-gpio-pin-status-changes/19150/4 "2019-12-14T17:17:30Z")