Octoprint Relay board

Hey Phil,

You can use gcode commands to turn on/ off your printer instead of gpio pins. I think that's how it works if you're not using octopi. I think i really complicated things with this project cause i probably could have used the gcode too. oh well. Relay boards are pretty versatile. i can apply it to many other projects.

Hi Phil. I use Octopi. The plugin is available for Octoprint but I think it’s meant to be used for a PSU. An atx type of some sort, but I’m not exactly sure. The plugin settings have a myriad of options. I’m sure it’s in there somewhere or you can check the documentation.

For the pi I just connected it to a gpio, 3v, and 5v pins which were also in the plugin settings. I just chose the first available. Any one will do.

I hope that helps.

Thats a good idea. I am concerned about how much juice is flowing through such a lil' circuit. I'll add today. Thanks for the tip.

Thanks John.

Hi Phil. I use Octopi with the Octoprint PSU Plugin. The plugin is available for Octoprint but I think it’s meant to be used for a PSU. An atx type of some sort, but I’m not exactly sure. The plugin settings have a myriad of options. I’m sure it’s in there somewhere or you can check the documentation. 

For the pi I just connected it to a gpio, 3v, and 5v pins which were also in the plugin settings. I just chose the first available. Any one will do.

I hope that helps.

Hi Craig

I love this! I also use OctoPrint.

What are you using to is trigger relay on and off with the Pi?

*Edit - Octoprint PSU Plugin. ... Nice.

Thanks for sharing the finished project. Looks good.

John

I finally got this thing up and running and it works great turning the printer on and off. After the breadboard prototype, i had to move stuff around and went a lil' off track from the original design that set me back a bit but i finally got it to work. Octoprint has a PSU plugin that saved me from having to edit any config files. I just setup the reset function in the plugin settings by adding the gpio pin to trigger the relay board and thats it.

Off to a good start finishing up some old projects. Time for some remote printing. I want to print a case but i only want to have one power cord to power everything. Power and ethernet coming in and printer and camera going out. Maybe a power switch too. Any suggestions?

The voltage is 12 with 7 amps

In that case you should be fine.

You'll need to add some wire onto the pcb traces.

If it's using a supply from a computer, they often fool it by bridging out the enable wire.

You might be able to interupt that instead.

Mark

Correct, you can get it to work but it is much easier to keep the power side separate from the PI, the PI wants 5V, nice and clean, the relays and the LED loads want probably 12V and it will have quite a bit of noise when switching so if you want to avoid hard to diagnose issues, keep them separate except for a common ground