The controller is entirely hardware based, and provides the typical sequencing for a standard 3-light traffic signal. I built this traffic light controller / sequencer when I was firstlearning electronics, and it is what I would consider a crude and ugly device. However, I learned a lot while building it, and it served its intended purpose. making the traffic signal I bought off eBay flash in the standard
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Green - Yellow - Red sequence. In addition, I built the controller with variable speed control, and the ability to "hold" any of the lamps full-on or full-off. The casing for the controller electronics is an old, re-used cookie tin. While not the most eloquent container; the cookie tin served its purpose while provided my circuit a unique and fire-resistant case. If I were to rebuild this traffic light controller, I would suggest the use of a different casing material. The basic sequencing operation of this traffic light controller is simple. The 555 Timer IC generates a voltage "pulse" at a specific timing interval. This interval is set using a capacitor and two resistors, one of which is the potentiometer (basically a variable resistor). The 4017 decade counter IC has 10 output ports, of which only one port is turned on at any given time. Each time the 555 Timer sends out a pulse, the 4017 decade counter turns off the currently-active output port, and turns on the next output port. Output port #10 is connected to the RESET pin of the counter, so that anytime the counter tries to activate output #10 it ends up immediately jumping back to Output port #1 (i. e. it starts over counting from 1). In this way the counter loops continuously from output port #1 through #9. Each of the decade counter`s output ports is assigned to a different color light of the traffic signal. For example, mine is connected so that output ports #1...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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