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Chapter: Microprocessor and Microcontroller - I/O Interfacing

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Traffic Light control Controller Using 8086

Traffic light controller interface module is designed to simulate the function of four way traffic light controller.

Traffic Light Control: Traffic Light Controller Using 8086

 

Traffic light controller interface module is designed to simulate the function of four way traffic light controller.

Combinations of red, amber and green LED’s are provided to indicate Halt, Wait and Go

signals for vehicles.

Combination of red and green LED’s are provided for pedestrian crossing. 36 LED’s are arranged in the form of an intersection.

A typical junction is represented on the PCB with comprehensive legend printing.

At the left corner of each road, a group of five LED’s (red, amber and 3 green) are arranged

in the form of a T-section to control the traffic of that road.

Each road is named North (N), South(S), East (E) and West (W). LED’s L1, L10, L19 & L28 (Red) are for the stop signal for the vehicles on the road N, S, W, & E respectively.

 

L2, L11, L20 & L29 (Amber) indicates wait state for vehicles on the road N, S, W, & E respectively. L3, L4 & L5 (Green) are for left, strait and right turn for the vehicles on road S. similarly L12-L13-L14, L23-L22-L21 & L32-L31-L30 simulates same function for the roads E, N, W respectively.

A total of 16 LED’s (2 Red & 2 Green at each road) are provided for pedestrian crossing.

 

L7-L9.L16-L18, L25-L27 & L34-L36 (Green) when on allows pedestrians to cross and L6-L8, L15-L17, L24-L26 & L33-L35 (Red) when on alarms the pedestrians to wait.

 

To minimize the hardware pedestrian’s indicator LED’s (both red and green are

connected to same port lines (PC4 to PC7) with red inverted.

Red LED’s L10 & L28 are connected to port lines PC2 & PC3 while L1 & L19 are connected to lines PC0 & PC1 after inversion. All other LED’s (amber and green) are

connected to port A & B.

 

·        Working:- 8255 is interfaced with 8086 in I/O mapped I/O and all ports are

 

output ports. The basic operation of the interface is explained with the help of the enclosed program. The enclosed program assumes no entry of vehicles from North to West, from

road East to South.

At the beginning of the program all red LED’s are switch ON, and all other LED‘s are switched OFF. Amber LED is switched ON before switching over to proceed state from Halt state.

The sequence of traffic followed in the program is given below.

 

a) From road north to East From road east to north From road south to west From road west to south From road west to north

 

b) From road north to East From road south to west From road south to north From road south to east From road north to south From road south to north

 

Pedestrian crossing at roads west & east d) From road east to west

 

From road west to east

Pedestrian crossing at roads north & south



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