WORKING MODEL OF A TRAFFIC SIGNAL USING IC 4017 & IC 555.
This traffic light is made with the help of counter IC,which is mainly used for sequential circuits.We can also call it as Sequential Traffic Lights. Sequential circuits are used to count the numbers in series. Coming to the working principle of Traffic Lights,the main IC is 4017 counter IC which is used to glow the red,yellow and green LED respectively. 555 timer acts as a pulse generator providing an input to the 4017 counter IC. Timing of glow of certain lights totally depends upon the 555 timer’s pulse, which we can control via potentiometer. So if you want to change the time of glow, you can do so, by varying the potentiometer, having the responsibility for the timing. LED’s are not connected directly with 4017 counter, as the lights won’t be stable. We have used the combination of IN4009 diodes and the LED’s to get the appropriate output. Main drawback of this circuit is that, you can never have an exact timing with this, however you will have the best estimated.
Post time: Jun-19-2017