Help creating a shutdown button?

[bez252]

Hi, I am trying to add a button/switch to my mirror for safe shutdown. I am using RPi3 model B.

I have this: https://www.amazon.com/gp/product/B0170B75EU/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

The problem I am having is with adding the code to make it function as a shutdown button.

Full disclosure: I know absolutely nothing about how to use python.

Any help you can provide would be appreciated.

[Jopyth]

@bez252 I made a module (acutally two) for this, however they are not (very well) documented and I just made them for myself. But if you want, I could upload them.

I have four buttons conncted to the RPi, and one of them shuts down the system on a long press (>3 seconds).

There is also this module, which you can adapt by adding a shutdown command.

[bez252]

@Jopyth
That would be awesome, thanks.

[pugsly]

I got one of these for my mirror, still havn’t built or assembled it yet.

https://www.pi-supply.com/product/pi-supply-raspberry-pi-power-switch/

[bez252]

@Jopyth So, with the module you linked, would these default settings mean that it activates when pin 5 is grounded? I apologize for all these dumb questions. Iḿ really new to this entire scene. Also, what would I need to change to make it shutdown?

´/* global Module */

/* Magic Mirror

• Module: MMM-Button
• MIT Licensed.
  */

Module.register(‘MMM-Button’,{
defaults: {
buttonPIN: 5,
//time in miliseconds before another button click is recognized
clickDelay: 500,
},
// Override socket notification handler.
socketNotificationReceived: function(notification, payload) {
if (notification === “BUTTON_PRESSED”){
this.sendNotification(notification, payload)
}
},
start: function() {
this.sendSocketNotification(‘BUTTON_CONFIG’, this.config);
Log.info('Starting module: ’ + this.name);
}
});´

[bez252]

Also, would these instructions work with the button I have?: http://www.mausberrycircuits.com/pages/setup

Or would they only work with the mausberry circuits buttons that attach to the power cord?

[Jopyth]

@bez252 Actually what they describe might also work for you, based on a quick glance through the setup code.

To shutdown from the node_helper you need to change some code in the file(will be in MMM-Button/node_helper.js in your file system).
Here is an example from my module to shut down the RPi, you can replace the self.sendSocketNotification(...) in the node_helper with a similar command:

exec('sudo shutdown -h now', null);

Also, at the beginning of the file you need to include the exec function, like here:

const exec = require('child_process').exec;