Upgrades to Makerfarm i3v 3d Printer - Octoprint Scripts

Power control with Octoprint running on a Raspberry Pi.

Solid state relay controls the main power.
As the Makerfarm i3v board still gets power from the USB connection I added the two board relay.

One relay controls the USB - sliced unto a USB cable and fished out the (red) power wire.
Second relay controls the light.



The Home Depot LED light (about $19) has the transformer on the plug so the wires to the light are only carrying about 7 volts DC.

Wired the light switch so that the existing switch or the relay can provide the completed circuit.

The LED light was switching on the neutral/negative side - I would have preferred positive side but didn't want to change the wiring completely. You can see the small nick I made to test the polarity and voltage.





Added and Emergency Stop - this runs between the low voltage - so it just cuts the power to solid state relay and that drops the power on the high voltage side.



Backside of Emergency Stop used spade connectors so I could disassemble if needed.



Emergency Stop - powered.



At the end of a print I get an email and ios notification with filename, print time and snapshot.

To get it all working I created three bash scripts - turn on, turn off and print finished:

Bash Scripts:

printer_on.sh
#!/bin/bash
#pwr
gpio export 23 out
gpio -g write 23 1
#usb pwr
gpio export 24 out
gpio -g write 24 0
#light pwr
gpio export 18 out
gpio -g write 18 0

printer_off.sh
#!/bin/bash
#pwr
gpio export 23 out
gpio -g write 23 0
#usb pwr
gpio export 24 out
gpio -g write 24 1
#light pwr
gpio export 18 out
gpio -g write 18 1

printDone.sh

#!/bin/bash 
/bin/echo "" | /usr/bin/mail -s  "$1" xxx@bxc.io
/usr/bin/curl -s -o /tmp/printDone.jpg "http://localhost:8080/?action=snapshot" > /dev/null
/usr/bin/mpack -s "$1" /tmp/printDone.jpg xxx@hotmail.com 
/home/pi/scripts/printer_off.sh

Octoprint config file:

system:
  actions:
  - action: printer on
    command: /home/pi/scripts/printer_on.sh
    name: Turn on the printer
  - action: printer off
    command: /home/pi/scripts/printer_off.sh
    confirm: You are about to turn off the printer.
    name: Turn off the printer

events:
  enabled: True
  subscriptions:
  - event: PrintDone
    command: /home/pi/scripts/printDone.sh "Done {name} {time}"
    type: system
  - event: PrintCancelled
    command: /home/pi/scripts/printDone.sh "Cancelled {name}"
    type: system
  - event: PrintStarted
    Command:  "/home/pi/scripts/webcam start"
    type: system