IR remote control is a device you can find everywhere where you can find TV, VCR or home theatre. Why not to use one of them for controlling your own devices like light, air conditioning etc. As we know remote control devices uses IR light. This is invisible light about 950nm wavelength. One biggest problem in using IR light is that there many oth
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er sources of it like sun, light bulbs, fire. In order to exclude other sources, IR signal is modulated by some frequency. Receiver has to be tuned for this frequency. Mostly remote controls transmit IR signal using 36kHz frequency signals. Transmitting and coding is one part which can be done more easily than receiving and decoding. Decoding is usually performed by using microcontrollers. Firs of all receiver has to get rid of 36kHz carrier frequency. This is not simple task to demodulate signal, this is why special IR receiver IC`s are produced. One of them is TSOP1736: this receiver simply removes 36KHz carrier signal and gives clean pulses that are used for device control. I won`t go too deep in how it works you can find this information in datasheets. This module is convenient to connect to microcontrollers like AVR or PIC, because it forms TTL signal levels compatible to them. Pulse-distance modulations is commonly used by LG, JVC, Acorp, Hitachi, Nokia, Aiwa, Akai, AverMedia, NEC. So further we will discuss only this modulation type. As you have noticed pulse-distance modulation uses fixed length pulses while gap defines weather it is 1 (long gap) or 0 (short gap) logical value. When using Pulse-Distance modulation firs goes LSB then MSB bits. If remote control button is pressed for a long time, then it sends one full packet and then after som time continuously sends unitary pulses informing that button is still...
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....
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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....
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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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