This project uses the similar technique to these products, however it can write a continuous stream of text using a high speed rotor and a strip of LEDs. The word WhirlyGig is derived from the word whirl meaning to spin, and the acronym GIG which stands for Graphical Information Gyro. The WhirlyGIG is an electronic display created using just 8 LEDs.
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These LEDs move at a relatively high speed on the end of a rotor, and flash specific patterns at precise time intervals. To the viewer, it has the appearance of a curved LED matrix sign with scrolling text. The sign has a full 360 degrees viewing angle, but there is a point on the sign where new text appears, and old text disappears. The sign message is fully programmable since it makes use of a PIC16F84 micro-controller. The original program design allowed a 256 character message to be Hard-Coded into the PIC`s program memory. Later versions allow the display to continually communicate with a computer via a simplex serial port link. This allows a message of any length to be displayed. When an intense light source is swept through the air, glowing trails can sometimes be seen. The effect of the air appearing to remain glowing after the light source has moved is an optical illusion. This effect relies on the `Persistence of Vision` of the viewer`s retina (the photosensitive part of the eye). In general, the human eye has an exceptionally quick reaction time in detecting dark to light transients, however for light to dark transients it is much slower. This causes a temporal memory effect which can produce interesting effects especially with bright light sources in dark conditions. A common example of this is the ability to draw shapes with sparklers on bonfire night. The WhirlyGIG display comprises of a strip of 8 ultra...
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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