A year ago I built a simple line following mobot. It doesn't use any microcontroller(Arduino, PIC, Atmel, etc.) and even logic ICs.
 |
| Simplest Line Following Mobot |
The chassis and wheels of the robot are recycled materials. The body is from a box of cookies and the wheels are from the container of wafer stick. I also added a wristband from one of presidential candidates last election for the additional traction of the wheel.
The whole circuit for this mobot is not mounted on a pcb nor a protoboard but on a mini-breadboard. I also uses scrap components for this mobot I found on my bin.
 |
| The circuit on the mini-breadboard |
This is the circuit of the simple line following mobot.
Basic components are used in this mobot. I uses the following components(all in pairs): bright leds, resistor, variable resistor, ldr, general purpose npn transistor, signal diode, spdt relay and a geared dc motor.
Here are some pictures of the mobot parts:
 | ||
| Top view of the mobot |
 |
| DC Geared Motor with recycled wheels. |
 |
| Sensor part: pair of LEDs and LDRs. |
 |
| Powered up! |
 |
| Isometric view of the robot |
This is a simple demo video showing the performance of the mobot:
