This system is used to distribute IR commands around your house. This is useful if you have A/V equipment in one room that you want control from several other rooms. This project uses one Microchip PIC 16F877 to do all the work. The firmware is written in mostly C. It is compiled with Hi-Tech`s free PIC C compiler, available here. The schematics w
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ere drawn with CadSoft`s Eagle schematic drawing program, which is also free, and available here. Here is the main schematic. Click on it for a larger picture. It can be built one of two ways: simple input mode, or deluxe input mode. With deluxe input mode, the circuit can detect which inputs have something connected and will inform you via the status LEDs. If an LED is off, there`s nothing connected. If an LED is on, there is something connected. With simple mode, the circuit can`t tell you whether there`s something connected or not, but it does use less parts. To select whether you want to simple or deluxe mode, you will have to change the BETTER_IR_EYE_MODE definition in the code and re-build. The code has been built in deluxe mode by default. Port B is used for the eight inputs. Each input is connected to one of two things: a piece of equipment that has some sort of remote control jack (like a Pioneer SR jack), or an IR receiver module, or "eyeball". Either way, the signal must be +5V when idle and have 0V pulses when active. If you hook this to some equipment that has an output jack, it is expected that the equipment outputs a baseband (ie, demodulated) version of the modulated IR pulses from your remote controls. The inputs can be set up in simple mode or deluxe mode. In simple mode, no extra components are needed for the inputs. The internal port B pullup resistors are used. If an input is high, either nothing is...
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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