This color changer mixes light from high-power LEDs to create more than 16 million colors. A smooth auto-fader cycles the colors, or you can hook it up to a USB port and control it from your computer. This color changer borrows a well-known color model used in TVs and LCD panels. These displays blend red, green, and blue light to create a vast num
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ber of colors. Look closely at your monitor - this image of the DIY Life site is made of tiny red, green, and blue dots. We`ll mimic this technique by mixing light from red, green, and blue LEDs. The easiest way to dim LEDs is to blink them and vary the ratio of on and off time. If the LED blinks fast enough, we perceive it as a solid light of lower intensity. This method of dimming is known as pulse-width modulation (PWM). The figure below shows a single period in a pulse-width modulation cycle. At the start of the period, the signal is high (the LED is on) for the time defined as the duty cycle. When the duty cycle is finished, the signal goes low (the LED is off) for the remainder of the period. Adjusting the duty cycle varies the brightness of the LED. By extending this to red, green, and blue channels, we can mix a nearly infinite number of colors. I chose the Microchip PIC 18F2550 as the microcontroller for this project (IC1). It has a full-speed USB connection and a free firmware framework for a generic serial port to USB emulator. It`s got a ton of program space for fancy, stand-alone fading programs. As far as support gear goes, we need a 0. 1uF capacitor between the power and ground pins (C6), and a resistor and diode are needed for the ICSP programming header (R7, D1). The on-chip USB peripheral requires an additional two 0. 1uF capacitors (C7, 8) and a 20 MHz crystal (Q1)- don`t forget two 27pF caps for the...
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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