Expressions North-South Lights East-West Lights Red = QD’ Red = QD Yellow = QDQCQBQA Yellow = QD’QCQBQAįigure (4): Expressions for the individual led outputs At the end, all of the components are grounded. The outputs of theĬounter then goes into a series of logic gates made up of AND and NOR gates which power the LEDs at specified times. Timer which outputs into the 4 bit counter to count up from 0 to 15 in binary.
The circuit then continues by powering the The diagram starts at the power supply whichįeeds into the timer, 4 bit counter, and the logic gates. From this we can see the connectionsīetween each of the components within the circuit. This the block diagram representation of the circuit. Block Diagram Figure (2): A step by step breakdown of the basics of the traffic light circuit Loop continues and the timer resets back to time 0. North-South lights turn yellow, while the East-West lights remain red. Between secondsĨ-14, the North-South lights are green, and the East-West Lights are red. North-South light remains red, but the East-West lights changes to yellow. The North-South lights are red and the East-West lights are green. The traffic light controller operates so that within the first 0-6 seconds, ForĮxample, when the set of lights facing North- South has the red light, the East-West lights have Working traffic lights that function together if they were facing perpendicular to each other. Specifications Time (Seconds) Traffic Light North-South Traffic Light East-West 0-6 RED GREEN 7 RED YELLOW 8-14 GREEN RED 15 YELLOW REDįigure (1): Times for the individual lights and their respective colorĪccording to the specifications of the traffic light controller, we are to have two sets of Order to turn on the LEDs at the specified times. To do so we are utilizing logic chips, 555 timers, and a counter to count up from 0 to 15 in In this lab, weĪre remaking a traffic light controller to turn on LEDs (Red, Yellow, Green) at the appropriate LED lighting is a very useful advancement. Lights is related to the volume of traffic in each direction, as well as the time of day.Īdvancements in technology serve to reduce energy needed, improve efficiency of roadways,Īnd reduce the cost of maintenance. Traffic lights exist to maximize mobility and transport of roadways timing of the Laboratory Report Experiment Name: Traffic Light Controller I.
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