How to use push button to toggle Led in raspberry pi?

[JasonV]

Hello my name is Jason,

I have a question about how to set a push button as on/off function.
I already started to construct a push button which functions quite nicely as long as I push and release the button. It then changes from 1 to 0. But my intention that I very much would like to do is to turn on and off the LED light by PRESSING the button instead of releasing.

Kind regards,

Jason

[cymplecy]

Is it a physical button connected to a GPIO or a Node-RED dashboard button?

Can you paste a picture of your flow?

[Gunner]

@JasonV

But my intention that I very much would like to do is to turn on and off the LED light by PRESSING the button instead of releasing.

Near as I can tell, Node-Red's ui_button only "triggers" on release - as I discovered when working on this topic...

Can ui-button respond to double-click

Actually, it doesn't trigger on the "press", rather it triggers on the "release"... strange that I never noted that before. It clearly detects the press visually, so why not trigger on both?

However there are some solutions - such as creating your own button ...

Press button state

Hello Ali .. you could use the ui_template node and take advantage of javascripts mousedown and mouseup eventlisteners on the button. Example Flow [{"id":"81fc920712f2501c","type":"ui_template","z":"4895ea10b4ee9ead","group":"e68f0343d6bbfce5","name":"","order":0,"width":0,"height":0,"format":"<button id=\"myBtn\">Click Me</button>\n\n<script>\n(function(scope) {\n\nlet myBtn = document.getElementById('myBtn')\n\nmyBtn.addEventListener('mousedown', e => {\nscope.send({payload: 1})\n});\n\nmyB…

[edje11]

Hi Jason,

Have a look at the node-red-contrib-toggle
It will do the job.

[JasonV]

Dear Cymplecy

Yes it is a physical button connected to a GPIO of a raspberry pi( Ground -> GPIO 26) and a LED to the pins ( ground -> GIO 16)

When i push the button the state from the button change to 0 en the led turns off and when i release the button the state change back to 1

( when I press the push button )

( when I release the push button )

I would like that the LED stay on when the push button is released and goes back out when I press again

[eddee54455]

Try this:

and then make sure that the topic of this:

is set to: toggle

Ed

[JasonV]

I tried but then the led doesn't work anymore it just stays on

Settings Input

Toggle node

[eddee54455]

Add this before the Toggle node:

Edit it to look like this:

Ed

[JasonV]

Thx !!!

this did the job

[cymplecy]

Or a basic change node

No need for any JS