Model Traffic Lights Circuit Using timer IC

Sepcifications

Model traffic lights circuit using 2 555 timer IC’s and a few other electronics components. This circuit turns ON green LED, keeps it ON for some time, then turns ON yellow LED for a moment and finally turns ON red LED for almost the same duration as the green LED. This cycle again starts from green LED.

COMPONENTS:

• 2 x 555 Timer ICs
• LEDs: 1 Red, 1 Yellow, 1 Green
• Resistors: 100K, 47K, 2 x 330R, 180R
• Capacitors: 2 x 100uF
• Breadboard
• Few Breadboard Connectors
• (5-12)V Power Supply