Traffic Lights

Introduction: Traffic Lights

LIST OF MATERIAL
1- TWO TIMERS 555
2- TWO CAPACITORS 10uF
3- TWO RESISTORS 220 ohm
4- RESISTOR  470 ohm
5- RESISTOR 47K OHM
6- THREE LEDS 
BASSEM. ADEl...

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    6 Discussions

    how can i increase the time on the green and red leds?

    hey, this project looks interesting, do you think you could add some more info about it? why did you make it? how is the light change triggered? can you give some more info about how you put it together?

    1 reply

    this circuit shows the lighting sequence and this follows the Australian-standard.
    The red LED has an equal on-off period and when it is off, the first 555 delivers power
    to the second 555. This illuminates the Green LED and then the second 555 changes
    state to turn off the Green LED and turn on the Orange LED for a short period of time
    before the first 555 changes state to turn off the second 555 and turn on the red LED.
    A supply voltage of 9v to 12v is needed because the second 555 receives a supply of
    about 2v less than rail. This circuit also shows how to connect LEDs high and low to a
    555 and also turn off the 555 by controlling the supply to pin 8. Connecting the LEDs
    high and low to pin 3 will not work and since pin 7 is in phase with pin 3, it can be used
    to advantage in this design.

    i made it just for training
    look at the second picture to know how to put it together