The IR Widget captures the infrared signals used by remote controls. It is able to determine the carrier frequency and demodulate the carrier in the digital or analog domain. The captured information can be used to reproduce or recognize the signal. The hardware is designed to be as simple and low cost as possible. A PIC12F629 was used for the pro
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totype, but almost any PIC that uses the 12 or 14 bit instruction set could be used. The usual approach to low cost IR capture typically consists of an IR detector or demodulator module connected to a serial or parallel port. This can work quite well when the CPU is dedicated to servicing the port. It does not work very well within a preemptive multitasking operating system. The OS is constantly servicing hardware interrupts even when the system is idle, so the IR capture is constantly interrupted. CPU usage is high when polling is used. Using the hardware interrupt capability of the port can greatly reduce CPU load, but interrupt latency may cause inaccurate results. Parallel and serial ports are becoming less common, and USB adapters do not work for these simple circuits. The IR Widget solves these problems by using a microcontroller to do precise timing and send the data to the PC using ordinary asynchronous serial transmission. This allows the OS to service the serial port with it ’s normal drivers and allows the use of USB to serial converters. The circuit is powered from the serial port and the PIC directly drive the serial rx data line. An infrared detector module is used to allow the PIC to see every infrared pulse at close range. This allows for greatest detail and accuracy. An infrared demodulator module can also be used to allow for long range reception with less detail. Infrared remotes typically use a carrier...
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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