Traffic light model / Khairul Anuar Mohd. Radzali and Mohamad Taufik Mohamad Khir

This project is to expose about the simple or basic traffic light operation. The lamps move or change the position from red-green-yellow could be learnt. The circuit completed by two ICs as main controller. Furthermore, the ICs are 16 pins BCD decoder 4017IC and the timer (555 timer). The timer provides the BCD codes to the 4017IC. Then 4017IC will operate by sending the current to the base of transistors. Therefore, the transistors act as switch will switch on or switch off depends on the current delivered by 4017IC. As the result, the lamp will rotate their function by the sequence condition for the specified time delay.