Traffic light control experimental module is made up of array 20 LEDs. The LEDs are physically arranged on the front panel such that, they resemble traffic junction of a road. The traffic moves in all directions of NORTH, SOUTH, EAST and WEST. Colored LEDs are used to simulate RED, GREEN, and AMBER for each direction. In addition, 4 optical sensors are also used to signal the end of simulated traffic flow in each direction. There are LEDs, which simulate the flow of traffic.

Now the student has to write program, following rudiments of traffic signal lights. Each LED is accessible as one bit of I/O ports of 8255. Test programs are supplied along with the kit. More programs are to be written by the student or a trainee. The instrument is supplied with built-in power supply.

Specifications:

• Traffic: In 4 directions. Movement of traffic simulated by 2 LEDs in each direction.
  
• Sensors: 4 optical sensors.
  
• Signal: Red, Green and Amber LED in each direction.
  
• Every LED and optical sensors are bit-addressable.
  
• Built-in power supplies.