Specifications and features of line following robots:

• The robot can follow both black and white lines.
• It has uses an LDR (light depending resistor) sensor array to follow the line.
• It is controlled by an Atmega32 running at 1 MHz.
• The program is written in C using WinAVR as given below for two sensors arrangement.

Figure :- Logic development process

How to run two 7segment display with a single port of microcontroller.

For this purpose we can alternatively display the different data at different time repetitively from same port. Since there is some delay need to turn off the glowing LED of 7 segment display so by alternative display of different data in different segments we  can show as they are continuously displaying the data.