Ever since I built a MythTV, I have been able to eliminate my DVD and VCR remote controls. However, I still needed my television remote control to turn on the TV as well as to control the volume, mute, and video input signal selection. For a while, I didn`t think it was possible to control the TV serially until I was flipping through my Sony TV`s
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instruction manual and found a vague paragraph about the Control-S I/O port on the back of the unit. At first glance, this looked like something I would want to use to control my TV from MythTV, but as usual the instruction booklet wasn`t very specific on how I can use Control-S from home-brew devices. Luckily, I found a SIRCS description web page that provided the basic description of the protocol and information that others had found by experimenting with their Sony remote controls. With so little official documentation and disagreement on the actual timing, I decided to verify their work by building a simple circuit involving a photodiode sensitive to 940nm light and measuring the response of my RM-Y197 television remote control`s IR signal on an oscilloscope. I was able to verify all of the basic codes given on the page referenced above, as well as a few others. All of the buttons for this particular remote are given below. The last few codes are 15-bits and appear to follow a different protocol than SIRCS. These buttons are for functions which I do not use on my remote, so did not pursue them further. As described on the referred page, SIRCS goes as follows. The start bit is first to be sent, represented as a 2. 4ms high pulse, followed by seven bits representing the functional code (LSB first), the ID of the device (LSB first) which is either a 5-bit or 8-bit code, and a frame space. In the case of this particular...
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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