Let's Make Robots!
Set A Temperature For an Oven Using a Relay
This is my Arduino temperature-ramp PID controller, which is running on a hot plate (up to 325 C) and which shall also be tested on a furnace (up to 650 C).  This … Read more

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.


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__

PCB CNC Mill: Clamping makes a difference

This might be useful to anyone else here with a DIY CNC who does PCB milling: http://blog.holyscraphotsprings.com/2011/05/good-circuit-boards-require-good.html

I've had a really tough time figuring out how to clamp my PCBs: my boards often look like the "bad PCB" here: http://www.flickr.com/photos/11461247@N02/5697373918/

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.

Old pic: http://letsmakerobots.com/files/clone_cnc_closeup_1500px.jpg TinHead's Original: http://letsmakerobots.com/node/9006 Vector Drawings: … Read more

Why did my soldering iron explode?

I just replaced the tip of my TC201 iron (on a WTCPS soldering station), with a new PTA8 tip, and went downstairs to get some coffee.  *BANG*  I ran upstairs to see what had happened and found my soldering iron laying across the workbench a half meter away from the soldering station (not on the stand), and frantic investigation located the PTA8 tip near the station (it bounced off the stand) and the copper insert (the heat-conducting element) a quarter meter away from the soldering station.

So why did my soldering iron's tip explosively separate?  What the heck?

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.