Go to https://www.pcbway.com/ for high quality PCB prototypes, 3D printing and more! In this video we'll discuss how to do the electronics and wiring on a GRBL based DIY pen plotter using the ubiquitous 28BYJ48 stepper motors for the X&Y axis and a servo motor for pen control, since these simplified CNCs don't quite follow the GRBL textbook when it comes to hooking the Arduino up to the motor drivers and limit switches!
I for my part will also be building a custom controller board based on a cheap arduino clone, integrating the stepper motor drivers and auxiliary components for the endstop switches on the same board as the ATmega 328p will I my first ever custom circuit board run first try? (spoiler: no!) Custom controller or not, the schematic for the limit switches stays exactly the same as does the overall installation of the hardware on the machine!

Download the wiring diagram for any pen plotter using unipolar steppers and a servo motor here:
https://rb.gy/dxtjlr

BTW if you plan on building a similar plotter, please consider supporting my work on this channel by purchasing parts via these affiliate links:

Stepper motors & drivers:
https://ebay.us/b03nZR
https://s.click.aliexpress.com/e/_AaVT1D
RC servo:
https://ebay.us/92l3xR
https://s.click.aliexpress.com/e/_A8xg8L
Arduino clone:
https://ebay.us/ef71O5
https://s.click.aliexpress.com/e/_A9TyaX

This way I may receive a small comission with no extra cost to you, allowing me to make more helpful videos!

And like I said the other day, after subscribing and leaving a like on every episode of this pen plotter series you can download the full CAD model with all the dimensions here:
https://rb.gy/0f2445

it's a google sketchup file so you'll need sketchup 8 (free) to open it:
https://www.malavida.com/en/soft/goog...

Here's the combined 28BYJ48 + servo motor GRBL I talked about: https://github.com/ruizivo/GRBL28byj...

And the other versions, exclusively for unipolar steppers OR a servo:
GRBL 1.1 modified to work with unipolar X & Y axis: https://github.com/costycnc/costycnc...
GRBL supporting a servo on pin 11: https://github.com/robottini/grblservo

Needless to say, this version of GRBL works for ALL unipolar stepper motors , so if you don't use the 28BYJ48 but something stronger you'll just have to implement a more powerfull darlington driver to handle the higher currents.


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