Marlin CNC Pendant v1

*****Arminth has released V3 of this pendant here on thingiverse. His version uses an ESP8266 that greatly improves the performance of the encoder wheel and adds several enhancements. I highly suggest building his version! https://www.thingiverse.com/thing:5613080.*****

3/16/23 - Button Mapping and directions on how to structure the code for keypad functions are available at this link. https://docs.google.com/spreadsheets/d/173HH8YqZiV-fNRSedN56hadnbeUNPTuRooRot1piMeQ/edit?usp=sharing

3/12/23 - added knob for small encoder handwheel.

1/28/23 - Ver 1.3 firmware added. Adds multi-press on keys 1 & A to cycle through feed and axis, freeing up 6 keys for additional macros. Also added printable keypad overlays for standard key assignments for both v1.2 and v1.3 firmware.

1/15/23 - Added glue in adapter plate for small encoders. fits v1 & v2 style faceplates this but I have not tried these solutions yet to confirm. ***

***4/20/22 - Updated the sketch to clean up some unused functions from v1.0.

*3/11/22 Update: I've been live testing this on my machine for a couple weeks now and the only issue I have experienced is occasionally, if rotating the encoder too fast in the negative direction it will invert the direction of movement direction on a random line of gcode. Adding a short delay on the program loop or increasing the baud rate may resolveMarlin CNC Pendant v2 has been uploaded (https://www.thingiverse.com/thing:5362454).**

Finally an easy way to control my Marlin Based CNC for setup without having to interface with a computer. I looked at a lot of CNC Pendant projects but none that I found checked all the boxes for my wants/needs. lay3rworks's Gcode sender (https://www.thingiverse.com/thing:2105847) was close but lacked a rotary encoder so I started with parts of his code and worked from there.

I have this interfacing with a BTT SKR v1.3 running Marlin 2.0 firmware, but this should work with any board/firmware that supports a direct serial connection. The Arduino Nano essentially works as a gcode sender.

I've added schematics and the Arduino sketch, along with the Fusion360 file for anyone that wants to make changes. I'm a mediocre coder at best so there are bits of code that I copy/pasted from other places and things that need to be fixed that require a look from someone smarter than me, but as of uploading all of the functions work as I intended them to and I have had no bugs pop up during operation. As with anything that can take control of a machine that has a tool spinning at several thousand RPM, keep close to the emergency shut off for your first few runs to make sure nothing goes sideways.

I'll happily help anyone that wants to try and adapt this to a different controller board to the extent of my abilities, just message me thru https://www.facebook.com/TheOrneryMaker.

Parts list:

1x Arduino Nano 5v

1x 60mm hand wheel encoder - https://www.amazon.com/Electronic-Handwheel-Industrial-consumables-Accessories/dp/B09P15Y5GR/ref=sr_1_13?crid=1BB92QXD9XOL8&keywords=encoder+60mm&qid=1646572394&sprefix=encoder+60mm%2Caps%2C57&sr=8-13

1x membrane keypad - https://www.amazon.com/YETAIDA-Arduino-Universial-Keyboard-Membrane/dp/B07Q7FW8B9/ref=sr_1_7_sspa?crid=3Q5MCPOBEKQJR&keywords=matrix+keypad+arduino&qid=1646572625&sprefix=matrix+key%2Caps%2C77&sr=8-7-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyRlFNUjBYSTJFRTE1JmVuY3J5cHRlZElkPUEwMDE2NTcwUUZGUDQyRUlJUzZOJmVuY3J5cHRlZEFkSWQ9QTA1ODU5MjEyQ1BaOTNPR0E2R0c4JndpZGdldE5hbWU9c3BfbXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==

pin headers and connectors

Optional for axis and resolution LEDs

7x 5mm LEDs 5v - https://www.amazon.com/Millimeter-Emitting-Assortment-Diffused-Indicator/dp/B07N2H23DC/ref=sr_1_8?keywords=5v+5mm+led&qid=1646534796&sprefix=5v+5mm+%2Caps%2C86&sr=8-8

7x thru resistors (values will vary based on brightness wanted and LEDs used)

Optional for programming without removing cover

1x mini/micro/C type USB cable 8in or longer (depends on your Nano plug)

1x female USB connector (I used micro, you can use any spec you want but will need to modify the housing) - https://www.amazon.com/HiLetgo-Adapter-Connector-Converter-pinboard/dp/B07W844N43/ref=sr_1_4?crid=3PON1PGHHFHCY&keywords=micro+usb+female&qid=1646534939&sprefix=micro+usb+female%2Caps%2C63&sr=8-4

Print Settings

Printer Brand:

Creality

Printer:

Ender 3 Pro

Rafts:

No

Supports:

Yes

Resolution:

.2

Infill:

20

Filament: Poloroid pla Transparent Red

Category: Electronics