Let's Make Robots!

John_NY's blog

CNC Machine V2 with RepRap Controller

I finally finished my Fireball V90 CNC build.  In May, I got the frame, and I planned to use the motors and electronics I purchased for upgrading the Valkyrie-clone CNC.  So I made some NEMA-17 to NEMA-23 adapter plates from CD-R disks, and got it all up and running.  It's running off 12V for now, with 24V planned in the future.


Video Goggles

Presented here is a video goggle system assembled from commercial, off-the-shelf (COTS) components.  The system can be made from recycled materials for under $100.

Bricked! ATTINY2313 Repair with HV Rescue Shield


This blog post contains my build of a "HV Rescue Shield" by MightyOhm.  The High-Voltage Rescue Shield is a high-voltage programming shield that fits on an Arduino.  The Rescue Shield works on 28-pin ATMEGA ICs and on 20-pin ATTINY2313 ICs.  My use/instructions for now only concern resetting the LFUSE (clock fuse) so that the IC can be used with a 16MHz crystal.


I bricked my $3 µC IC on my first attempt at programming.  Recently I found some DIY AVR HV programmers that could be made from stuff in my lab.

Vendors I Like

I've noticed a few folks on LMR have mentioned their preferred vendors -- I though I might do the same on my blog.  There are more I'll probably add, but these folks are fresh in my mind. Everyone already knows about SparkFun, Adafruit, Electronics Goldmine, SeeedStudio/NKC Electronics and Gold Phoenix PCB -- this list includes stores I haven't seen mentioned.

__General-Purpose Vendors__

RepRap Stepper Driver v1.2 and Next Gen CNC

In the picture from top-left, clockwise to bottom-left: the terminal block (24V power up to 13A), the 2 X-axis drivers, the Y-axis driver (blue heat sink), and the Z-axis driver (blue heat sink), the Arduino controller (direction x3/enable x3/step x3), and just below the terminal block there is a small 9V regulator board to shift 24V down to 9V for the Arduino.  Everything is mounted on an MDF board, and the board is mounted with baling wire.


RepRap Conversion for a set of Probotix SideStep Stepper Motor Drivers


An Arduino or similar microcontroller shall be used to create a RepRap-style front-end for the HobbyCNC EZ Driver board or similar DB-25 controlled stepper driver.  This front-end microcontroller application would allow RepRap applications to control a number of powerful CNC machines.


Check the purple wire first (a.k.a. "so that's how my computer died")

So the power on my CNC machine was going to come from a computer power supply, and I had a recently decommisioned computer lying around.  Instructables and other sites have some good instructions on "ATX power supply to DC"  and "ATX power supply to lab power supply" (search strings).  After wiring the thin orange to the thick orange, and the thick green to black, and a red wire to a "sandbar" load resistor, I thought it should be working.  After all the changes, I still did not even have 5V coming out of my purple "standby power" wire. 

My First Robot

Draft Robot Page: http://letsmakerobots.com/node/12713

My first robot is a Valkyrie CNC using TinHead's example: http://letsmakerobots.com/node/9006


Vector Drawings: http://letsmakerobots.com/files/clone_cnc_vector.pdf (draft)
Measurements will be available for these drawings by December 2009 or if somebody bugs me for it.