Traffic Light Controller

abstr round This project operates carmine, gold and green directs in the adjust invest for a single UK traffic sapless up. The succession taken for the collar red - red & chromatic - green - amber sequence bottom be wide-ranging from almost 7s to about 2½ imports by adjusting the 1M preset. some(prenominal) amber LEDs transmit arc that is almost red so you may favour to use a yellow LED. The 555 astable roach provides clock pulses for the 4017 antagonistic which has ten issues (Q0 to Q9). Each output becomes game in wrench as the clock pulses are received. enamor 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 offshoot 5 counts (Q0-Q4 high), this saves victimization 5 diodes for red and simplifies the circuit. circuit plot 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 general timer IC wired in the Astable Multivibrator mode. Resistors R1, R2 and capacitor C1 act as the timing agents and the output pulses are available from the output fall 3 of IC1. These pulses are given to the input signal flag 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 part output pin 4 is attached to the reset pin 15 to stop the counting. So that the cycle repeats. With the evaluate of C1, to each one LED remains on for 1 minute. When one LED turns off, the second on turns on. This cycle repeats magnanimous the Traf fic light appearance. Resistor R3 keeps the ! input pin 14 of IC2 low by and by 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: turn diagram of Traffic light controller working of component separate Required...If you want to get a full essay, order it on our website: OrderEssay.net

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