Wednesday, September 11, 2013

Cell Phone Operated Robot

Radio control is used to remotely control a device that uses radio signals. Model vehicles from a hand-held radio transmitter term often used to refer to the control. Organizations, industrial, military and scientific research [traffic] as well as the use of radio-controlled vehicles. This often control the vehicle, or an infrared controller between a radio control device, cable. A remote control vehicle (Als called as RCV) is always controlled by a human and there is no autonomous positive action that which makes it to differ from a robot. One of the key technologies that underpin the region's remote control vehicle. It is vital that a vehicle should be capable of proceeding accurately to a target area to fulfill its mission and returning equally accurately and safely to base.

A recent Sony Ericsson introduced
remote control car which can be controlled by Bluetooth mobile phone. It does not require the vehicle to be limited by the length of the cable or the line of sight because the radio is the most popular. Bluetooth is still too expensive to be commercially viable and lower limits.

The contemporary keypad is laid out in a 3×4 grid, although the original DTMF keypad had an additional column for four now-defunct menu selector keys. When used to dial a telephone number, pressing a single key will produce a pitch consisting of two simultaneous pure tone sinusoidal frequencies. The row in which the key appears determines the low frequency, and the column determines the high frequency. For example, pressing the '1' key will result in a sound composed of both a 697 and a 1209 hertz (Hz) tone. The original keypads had levers inside, so each button activated two contacts. The multiple tones are the reason for calling the system multifrequency. These tones are then decoded by the switching center to determine which key was pressed.

The engineers had envisioned phones being used to access computers, and surveyed a number of companies to see what they would need for this role. This led to the addition of the number sign (#, sometimes called 'octothorpe' in this context) and asterisk or "star" (*) keys as well as a group of keys for menu selection: A, B, C and D. In the end, the lettered keys were dropped from most phones, and it was many years before these keys became widely used for vertical service codes such as *67 in the United States and Canada to suppress caller ID.

The U.S. military also used the letters, relabeled, in their now defunct Autovon phone system. Here they were used before dialing the phone in order to give some calls priority, cutting in over existing calls if need be. The idea was to allow important traffic to get through every time. The levels of priority available were Flash Override (A), Flash (B), Immediate (C), and Priority (D), with Flash Override being the highest priority

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