D.TJPEG
H-Bridge
This dual bridge will allow you to easily and independently control two motors of up to 2A each in both directions. Supply voltage was give from the 9V battery, and this H-bridge runs by separate 5v from Arduino.
The Arduino Uno is a microcontroller board based on the ATmega328 (datasheet). It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.
ARDUINO UNO
The HC-SR04 Ultrasonic Sensor is very affordable proximity/distance sensor that has been used mainly for different of projects. We decided to use two of HC-SR04 Ultrasonic Sensors on our robot. For example, the robot is moving to the right of the white board. When the robot is close to the edge, then one of the front sensor will send the signal to arduino board that the robot can know and decide to turn right or left. Also, we have to program it to turn different of directions on white board.
Ultrasonic Sensor
A servomotor is a rotary actuator that allows for precise control of angular position, velocity and acceleration.
4WD Robot Smart Car
We bought the 4WD robot smart car from ebay that will become main body of our robot. It contains four small DC motors. The speed of the wheels are controlled by dual h-bridge and connect to our arduino board.