Line-Following Mini-Tank: Parts List

Current Part:

IR Emitter LED
TIP120 Transistors (NPN)
Capacitor 47uF
SPST Switch
Jumper Wire
5k Trimpot
2N2222 Transistors
LEDs (Red/Green)
Soldering Iron
1N4001 Diodes
Tamiya Tank Kit
Tamiya Gearbox Kit
Bolts & Nuts
3.7v LiPo Battery

Parts List Details
           You may or may not be familiar with the parts above so a picture of each item has been included to help give you an idea of what they look like. I'll go through and explain the key parts below.

Analog Brains
           The 2N2222 and TIP120 transistors are both of the NPN type. As you will see in the schematic portion of this project write-up, these transistors are used to decide what to do when the sensors see black or white. The TIP120 transistors are high-power which makes them perfect for running the motors.

IR Emitter & Phototransistor
           These two components combined with a few resistors will tell the circuit whether black or white is currently sensed. If white is sensed a 0.7-1.0 Volt signal is sent to the analog brains. If black is sensed, 0 Volts is sent.

Tamiya Tank Kit
           This kit will give the foundation for the tank tread design of this robot. The treads can be lengthened or shortened but I find that keeping a tank shorter makes it more agile and therefore more mobile.

Tamiya Gearbox
           This is the two motor gearbox that will drive the tank forward, backwards, left or right. The two motors are 3v motors which match up nicely with the 3.7v battery that will be used.