Schematic
For build our robot we will need following components. I found cheapest on eBay. eBay: 1x Arduino Pro Mini atmega328 5V 16M 1x FTDI Basic Breakout USB-TTL 6 PIN 3.3/5V For Arduino(Micro USB) (for programing) 1x MPU-6050 Module 3 Axis Gyroscope+Accelerometer Module for Arduino 1x Stepper Motor Drive Controller Board Module L298N Dual H Bridge DC For Arduino 4x Intelligent Car Gear Motor Robot Gear Motor TT Motor for Arduino 4x Small Smart Car Model