This is based on a circuit from the superb electronics info pages at. If you want to know more about IR remote controls, from circuit details to data protocols, look there for info (under `remote control`)! This design allows multiple transmitters and receivers, all connected to a common 2-pin bus, consisting of data and ground. Data is active-l
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ow, pulled up by a resistor (in the transmitters) when not in use. This system was prototyped using the Temic TSOP 1838 module, then available from Maplin in the UK, which has now been discontinued. Keith Doxey may be able to sell you some. If anyone comes across another source for it, please let me know- contact details below. In the meantime, the Sharp IS1U60, available from RS Components, may do the same job (I`ve not yet tried it). For reference, the Temic part draws 1mA, has a usable range of at least 6m indoors, and 1-2m under bright fluorescent light, and includes a 100k pullup resistor on the output. The TSOP1838 device is a complete IR receiver in a 3-pin package. All that is required is a 5V power supply, applied to the appropriate pins. In the near future, I will add a schematic for a simple supply derived from a 12V supply (eg a battery or a `wall-wart` type supply) Most equipment is quite tolerant of modulation frequencies varying by about 5% (eg 38kHz nominal, 36-40kHz will work), but if you have an oscilloscope or frequency meter, you can change R3 to get the output closer to 38kHz (capacitor tolerances are high, so the circuit as built could oscillate at 38kHz +/- 20%, reducing range). If you don`t have access to any test equipment, and you need maximum range, fit a 200K trimmer in place of R3 and adjust it by trial and error for best results. This circuit is distributed as `feedbackware`- if you build it,...
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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