This project operates red, gold and green LEDs in the correct order for a single UK traffic light up. The time taken for the collar red - red & amber - green - amber sequence can be varied from almost 7s to about 2½ minutes by adjusting the 1M preset. Some amber LEDs transmit light that is almost red so you may favour to use a yellow LED. The 555 astable circuit provides clock pulses for the 4017 antagonistic which has ten outputs (Q0 to Q9). Each output becomes high in wrench as the clock pulses are received. Appropriate outputs are combine with diodes to supply the amber and green LEDs. The red LED is committed to the ÷10 output which is high for the first 5 counts (Q0-Q4 high), this saves victimization 5 diodes for red and simplifies the circuit.
circuit diagram description
This circuit simulates the trading Lights. The Red, Yellow and Green LEDs lights one by one for a period of 1 minute and the daily round repeats just wish the Traffic lights. IC1 (NE555) is the popular timer IC wired in the Astable Multivibrator mode. Resistors R1, R2 and capacitor C1 act as the timing components and the output pulses are available from the output pin 3 of IC1. These pulses are given to the input pin 14 of the Johnson decade counter IC CD4017. Out of the 10 outputs of IC2, only three outputs are apply to drive the LEDs.
The fourth output pin 4 is attached to the reset pin 15 to stop the counting. So that the cycle repeats. With the value of C1, each LED remains on for 1 minute. When one LED turns off, the second on turns on. This cycle repeats magnanimous the Traffic light appearance. Resistor R3 keeps the input pin 14 of IC2 low after each pulse.
Note - If LEDs are connected to all outputs, and the value of R1 and R2 is reduced to 100 K, a cart track light can be constructed. If R1 is replaced with 1M Preset, the speed of the running light can be adjusted. Reset pin 15 should be grounded.
Fig1: Circuit diagram of Traffic light controller
working of component
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