Let's Make Robots!

pcb

I did a brief video tutorial on Diptrace - this is part 2 on Laying out a PCB.  Part 1, covering schematics is here. \ Read more

PicAxe 20X2 mainboard

This is the second board I received from sparkfun / batchPCB. The other one, a motor driver, is tested and done.

Vary basic question about headers

This is a very simple question and I am only asking because it is fundamental to my first robot (and I don't have the money to get this bit wrong).

Custom Motor Driver Debugging

Hello LMR!

I built a motor driver, look: 

motor_driver_1.jpg

Cool isnt it? Of course it doesn't work as intended, but hopefully you guys can help me fix that. Lets take a look at the details first, and afterwards my problem.

I had a trip to Taiwan on May 31 and i'm coming back soon. During my trip i came across several electronic shops and man they sell electronics for a very cheap … Read more

My First BatchPCB, er batch

So I finally got my first home designed PCBs back from BatchPCB.  As a bonus, I got double the parts I ordered.

 IMG_2064.jpg

My L298 Motor shield:

 IMG_2065.jpg

My Q1114 sensor board (for line following/wheel encoders)  The mounting holes will need some rework.

 IMG_2066.jpg

Messing with the Picaxe editor help menu

When researching the exact connections on my 28x1 projectboard, I scowered my directory C:\Program Files\Programming Editor\datasheets\ and found user.txt.

And guess what? It lets you change the help menu in your editor.

picaxe_userhelp_rtfm.gif

That fourth option was not there before! All that was needed was one extra line in the textfile:
PCB hackers need to Read this F*****g Manual now!=c:\Program Files\Programming Editor\datasheets\axe001_pcb.pdf

Homemade PCB

I bought myself a new pc recently and as for most new pcs it was lacking either a parallel port or a serial port.  As i was using the parallel port to program my robot i had to find a usb programmer that i could use.  I use atmel chips and i found a circuit design for the USBasp programmer, which consists of another atmel chip that converts the usb data into data that can be used to program my robot.  I thought that this would be a good opportunity to try and build my own pcb.  I got some info from http://www.fullnet.com/~tomg/gooteepc

Gathering experience with homemade PCB

Oi, yesterday and today I have been trying to make a homemade PCB using Eagle for designing the PCB and printing with a laser printer onto some glossy advertisement paper from junk mail. After several attempts I still haven't gotten a good transfer of toner to the PCB (check images) and I'm wondering if I should just design my PCBs and then send the design files off to Olimex for production

dsc00773.jpg

PCB fabrication, a snapshot from the shoutbox

read bottom up:

jip: and of course we just used a marker pen to draw the tracks afterwards
jip: That was how we did it in public school :-)
jip: Oh well I used another method before... drilling holes prior to etching by laying paper layout on top and drilling through

Toner Transfer PCB

Yesterday, I made my first PCB since about 1978!  I used the toner transfer method, and it worked really well.  It's a little break-out board for an Atmel AVR, the ATmega8.  I've also allowed space on the board for a couple of extra chips (up to 18 pins) and four TO-220 driver transistors, for things like stepper motors.  Today, I'm drilling the holes in the board (1mm) and I expect I'll solder in the parts this evening.