The 21st century belongs to portable devices that are run by batteries. From smartphones and laptops to smart home and office appliances, the new electronics devices are compact in size, more power efficient, loaded with multiple features and run on supply provided by batteries. These electronic devices usually have components like diodes, transistors, capacitors or ICs having such components embedded in them which are polarized in nature.

So the electronics circuit of these devices essentially must be provided DC power is a specific polarity. Any battery has two terminals - Anode and Cathode and current always flows from anode to cathode. Actually, the electrons flow from cathode to anode.

Any machine programmable by a computer and capable of performing defined tasks is called a robot. There are many types of robots and robotic cars are one among them. The robotic cars are generally used to reach out to places where it may be dangerous for humans to reach or stay due to physical or environmental conditions.

The robotic cars may be used for surveillance or for performing some mechanical tasks in a remote location. The robotic cars make the most sense when they are controlled by some wireless technology. In this project, a robotic car is designed to sense ambient temperature, humidity, light intensity and detect obstacles in the path. The robot is controlled by a mobile app which connects with the robot through Bluetooth.