The objective of this project is to build a 1/10th-scale electric car that will be able to drive through a course or track and be able to response to the track surface and other obstacles.

·      Outlaw Rampage gas truck chassis, wheels, and transmission

·      Great Planes electric motor

·      Special gears

·      Futaba servos

·      Microchip 8-bit MCU PIC16F74

·      LM556 dual timer chip (configure as astable)

·      32K Digital POT

·      SPST Relays

1. I used an old remote control car for the chassis, wheels, and transmission.

2. I connected an old electric motor to the transmission using a customized gear system.

3. In order to steer the car, I use a 556-dual timer chip to control servos connected to the throttle and steering shaft.

4. However, to accurately drive the 556 chip, I connected it using an astable circuit with a digital potentiometer.

5. I used a micro-controller unit (MCU) from Microchip to manipulate the digital POT.

6. In addition, I connected the "Wiper UP" port of the POT to a relay to feedback the POT's current resistance.

Main Circuit

Position Chart

Taps for Digital POT

Preliminary Servo Control source (text file) - sequence is cw-ccw-cc-ccw, etc.

Preliminary Steering Servo Control source (text file)

Example Tcl Script 1 - GPS-Link (rar file)

Example Tcl Script 2 - AM2-Test-Link (rar file)