The Traffic Light Hack is a simple interface for controlling lights inside a traffic light enclosure. No, not a real light out on the street. This one was picked up at a flea market, and it`s hanging in my room. It is designed to be an ambient information device. When it is under computer control, you can run programs that collect information and
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output it on the traffic light. This "push" of information is supposed to keep you informed without your intervention. The original Traffic Light Hack was a huge success, being featured on Hack a day and in the book Makers. However, the original design was cumbersome, requiring multiple power outlets and a host computer with a parallel port for controlling the system. The Traffic Light Hack Mark II is a complete design of the traffic light hack. It is run by a microcontroller that has a set of predefined light sequences in addition to a USB interface for direct computer control and in-circuit reprogramming of the microcontroller. The circuit is based on the open Arduino platform. The embedded AVR ATmega168 can autonomously cycle the lights through any number of predefined patterns, or be controlled directly from a computer over an Arduino MiniUSB adapter. This circuit requires connecting to mainline power (120 V AC in the U. S. ). This is quite dangerous, and you can easily hurt yourself or damage your computer. Always check all circuit continuities before plugging anything in. If you mess up, it`s not my fault. It has been suggested by the ever-civil commenters at Hack a day that driving relays directly from a microcontroller is, in short, a Very Bad Idea. The inductive coils can cause a high kickback voltage when they are suddenly closed, possibly damaging the microcontroller. They also require a large current draw, which...
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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