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Department of Electronics & Communication

Traffic Light Control PREPARED BY: Sherasiya Akaram ( ID NO: 09EC04) Shukla Dhaval ( ID NO: 09EC67 ). Department of Electronics & Communication Shankersinh Vaghela Bapu Institute Of Technology,Vasan . INTRODUCTION.

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Department of Electronics & Communication

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  1. Traffic Light ControlPREPARED BY:SherasiyaAkaram (ID NO: 09EC04)ShuklaDhaval (ID NO: 09EC67) Department of Electronics & Communication ShankersinhVaghelaBapu Institute Of Technology,Vasan.

  2. INTRODUCTION • One way traffic light controllers having three signal Red, Green and Yellow  • To ensure that suitable traffic signals are provided to reduce accidents and improve conditions for public transport

  3. Signal To StopSignal to Proceed With CautionSignal To Go-Ahead

  4. How Traffic Light Control Work ? • The circuit based around 555 Timer IC (Astable mode) + 4017B Johnson counter • The 555 astable circuit provides clock pulses for the 4017 counter which has ten outputs (Q0 to Q9) • the sequence of the traffic lights is spread over 10 clock pulses

  5. PART LIST IC 1. NE555 2. 4017B SEMICONDUCTOR LIST 1. D1 TO D6: 1N4148 2. L1,L2,L3 : LED 

  6. RESISTOR LIST 1. 3*01 K OHM 2. 1*10 K OHM 3. 2*22 K OHM 4. 1*100 K OHM CAPACITOR • 47 µF • 0.01 µF • 6.8 nF

  7. MISCELLANEOUS 1. 16 pin IC socket 2. 08 pin IC socket 3. Battery snap 4. 2 pin battery connecter

  8. CIRCUIT DIAGRAM

  9. WORKING OF CIRCUIT • The 555 timer IC is connected for Astable Operation, the clock pulses are fed to the 4017 IC via the 10K resistor. • The 4017 is a 10 stage counter, therefore the sequence of the traffic lights is spread over 10 clock pulses, 4on red, 1 on red & amber, 4 on green and 1 on amber

  10. Each output becomes high in turn as the clock pulses are received. Appropriate outputs are combined with diodes to supply the amber and green LEDs. The red LED is connected to the ÷10 output which is high for the first 5 counts (Q0-Q4 high), this saves using 5 diodes for red and simplifies the circuit.

  11. OBSERVATION TABLE

  12. APPLICATION • Control the flow of traffic • Reduce the risk of accidents

  13. REFERENCE • www.clarkson-uk.com • www.rshelectronics.co.uk

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