This is Lunchbox, a line Following robot built as a technology demonstrator for a competition at my local hackerspace.  The competition rules state that you must build a line following robot that will complete the course in the fastest time but you are not allowed to use a microcontroller or any programmable piece of silicon.

I tested it on my trusty magcian chassis before I put it in its permanent "chasis".  Unfortunatly I did not take a picture of the line sensors and the robot is allready at its new home.

The big resistors was in an effort to slow down the motors since it kept speeding over the line.  In the final version I used a LM350 voltage regulator to drop the voltage to the motors.

The gearboxes were taken from cheap toys and the front castor is from a tub of "alien goo" candy.

The schematic is from the book 123 Robotics Experiments for the Evil genius by Mike Predko.

The stripboard layout was done in DIY Layout Creator.  The resistors and layout for the line sensor was seperate.

And a movie of lunchbox in action:


If the embedded video does not show, here is the link:


Submitted by Roxanna77 on Sat, 2016-10-08 16:03

Roxanna77's picture

Nice job, looks to work quite well! Interesting but cool challenge to not use any microntroller, thanks for sharing the skematic and PCB layout. 


"Propeller Girl"
I tinker, therefore I am.....

Submitted by nschreiber0813 on Sat, 2016-10-08 16:54

nschreiber0813's picture

Dear: Mr. Boo

Nice robot!!! I love the fact you didn't use a microcontroller. You deffinitely know more about electroncics and logic gates than I do. Keep up the good work.

From: Noah

Submitted by viswesh on Sat, 2016-10-08 21:52

viswesh's picture

Nice work sir

Submitted by Mr_Booo on Mon, 2016-10-10 07:14

Roxy:  The whole no microcontroller idea was mine.  Not that I want to bash the Arduino but a lot of tinkerers and hobbyists have never heard of a 555 timer or even a comparitor not to mention an OP-amp.  So the idea is to show them there is a world where logic gates and analouge electronics exists and sometimes a project can be done differently and in some cases more cheaply than with a microcontroller.

Noah:  Tx as allways for the kind words, but I cant take credit for all of it.  Most of it came from a book!  And dont sell yourself short.  I have seen your work and it is most impressive.

I will see if I can post pictures and video of the competiton when it happenes on the 27th of October.

Submitted by nschreiber0813 on Mon, 2016-10-10 18:19

nschreiber0813's picture

Dear: Mr. Boo

What was the book? And thanks!!! I just wish I could stay commited to a project lol but anyways I think I am commited now at least.

From: Noah

Submitted by Mr_Booo on Fri, 2016-11-04 03:43


Here is the photo of the competing robots:


We had lots of fun, but unfortunatly there is no video.

Last updated: 
7 Oct 2016 - 12:56
Robot type: