Home | Site Map | Components | 555 | Symbols | Study | Books | Construct | Solder | Projects | FAQ | Links | Privacy
Electronics Club
electronicsclub.info

Traffic Light Project

Download PDF version of this page

UK Traffic Light sequence Traffic Light
This project operates red, amber and green LEDs in the correct sequence for a single UK traffic light. The time taken for the complete red - red & amber - green - amber sequence can be varied from about 7s to about 2½ minutes by adjusting the 1M preset. Some amber LEDs emit light that is almost red so you may prefer to use a yellow LED.

The 555 astable circuit provides clock pulses for the 4017 counter which has ten outputs (Q0 to Q9). 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.

This project uses a 555 astable circuit to provide the clock pulses for the 4017 counter.


Parts Required

Bitsbox
Hobbycraft
  • resistors: 470 ×3, 22k, 100k
  • capacitors: 0.1µF, 1µF 16V radial, 10µF 16V radial
  • diodes: 1N4148 ×6
  • LEDs: red, amber (or yellow), green
  • 1M preset, horizontal
  • 555 timer IC, such as NE555
  • 4017 counter IC
  • DIL sockets for ICs: 8-pin, 16-pin
  • on/off switch
  • battery clip for 9V PP3
  • stripboard: 20 rows × 21 holes


Stripboard Layout

Stripboard layout for traffic light project


Circuit diagram

Circuit diagram for traffic light project



© John Hewes 2014, electronicsclub.info (based in the UK)
No part of this website may be reproduced in any way commercially without my prior permission.

Site Map

Top of page

Home
Downloads
Books
FAQ
Contact
Discounts
Links

Construction
 - Breadboard
 - Stripboard
 - PCB

Soldering
 - Tools
 - Workbench

Components
 - Capacitors
 - Connectors
 - Diodes
 - ICs ('Chips')
 - CMOS logic ICs
 - 74 series ICs
 - Lamps
 - LEDs
 - Relays
 - Resistors
 - Switches
 - Transistors
 - Variable Resistors
 - Others
 - Starter Kit

555 Timer IC

Study
 - Block Diagrams
 - Circuit Diagrams
 - Circuit Symbols
 - Electricity/Electron
 - Series & Parallel
 - Voltage & Current
 - Meters
 - Multimeters
 - Resistance
 - Ohm's Law
 - Power & Energy
 - AC & DC Signals
 - Oscilloscopes
 - Power Supplies
 - Transducers
 - Voltage Dividers
 - Transistor Circuits
 - Analgoue & Digital
 - Logic Gates
 - Capacitance
 - Impedance
 - Counting
 - Quantities & Units
Projects
 - Dummy Alarm
 - Quiz
 - Traffic Light
 - Dice
 - Model Lighthouse
 - Simple Tester
 - Flashing LED
 - Electronic 'Lock'
 - Adjustable Timer
 - Light Alarm
 - Xmas Decoration
 - Railway Signal
 - Level Crossing
 - Lead Tester
 - 'Random' Flasher
 - Heart Badge
 - Valentine Heart

More Projects

Kits for Children

Electronics Club

Tsohost
Use coupon code
electron10 for 10%
discount off hosting
Privacy Policy & Cookies
This website does not collect any personal information unless you contact me by email. If you send me an email your name, email address, and any other personal information you supply will be used only to respond to your message. Your personal information will never be given to any third party without your permission.
This website displays affiliate advertisements. If you click on these advertisements the advertiser will know you came from this site and I may be rewarded if you become their customer. No personal information is passed to advertisers.
This website uses StatCounter cookies to estimate the number of unique visitors. No personal information is stored in the cookies. If you would like further information or wish to refuse these cookies please visit the StatCounter website.
To learn how to delete and control cookies from your browser please visit AboutCookies.org.