Hi I just wanted to share this little video of an addon I just made to my Lulzbot Mini.
The Mini is now controlled with a Raspberry Pi running Octoprint. A physical switch starts heating. While the tool is heating, the led blinks. When the tool reaches within 5% of the target temperature, the LED turns on, and the button for extruding filament is enabled.
This was done with Node Red on the Pi to read and control the GPIO pins.
See a video here: https://youtu.be/YA2vBQz9IXo