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Robotic Projects
Red Spot

Misc. Projects

Red Spot


Red Spot was created in as a complement to Feeling Blue. This robot uses an Atmel as its brain. I did not write the source code as I don't really know much about Atmels. A fellow that I was attending college with at the time wrote the line following code.

Chassis and Propulsion

Just as feeling bloe, the red spot uses the same round robot chassis from Pololu. The motors are a Tamiya Dual Motor Gearbox with Tamiya Truck Tires. The Pololu round chassis is fairly inexpensive and can make creating a robot pretty easy.

Line Sensors

The robot uses three OPB742 IR emitter/IR Photo transistors to detect the line. Three is just barely enough to successfully track a line. The sensors have a fairly limited range so they have to be placed very close to the ground. The output of the sensors is combined to get the position of the line.

Robot Brain

The robot is driven by an Atmel Atmega8-16PC @ 16MHZ. The micro monitors all the sensors and takes the appropriate action when a sensor is triggered. The algorithm is pretty basic as I never really finished the code. The is no PID loop or anything fancy like that. The speed of the motors is set from a table based on where the line is that is it.

Feeling Blue Data Sheet

Robot class Line Follower
Size 5.1 in(W) x 6.9 in(L) x 2.75 in(H)
Weight 325 grams
Frame Pololu round chassis and protoboard
CPU Atmel Atmega8-16PC
Assembly written in the AVR Studio
Power 7.2V from a six cell Nicd battery pack. The voltage
is regulated to 5V for the CPU.
Motors Tamiya Dual Motor Gearbox.
Motor driver L293 driven by microprocessor
Speed Control Software generated Pulse Width Modulation.
Drive System 2WD using two motors
Tires 1.5" Tamiya Truck Tires
Sensors Three OPB742 IR line sensors.

Red Spot code and schematics

I don't have the code anymore for this robot.

I never created a schematic for this robot as it was point to point wired from the datasheets of the parts used.

This information is supplied in the hope it may be useful but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose.

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