Chapter 12

Radio Transmitters and Receivers

There are many low cost radio transmitters and receivers on the market from companies like Quasar, Radiotronix, and RF Solutions, transmitting on 433 MHz and costing as little as £3 from Farnell.com. They do not need a license to operate and are fairly straightforward to use.

The transmitters only have three connections, two power supplies, and one data input, the transmitting aerial is incorporated on the unit. The receiver has four connections, two power supplies, one aerial input, and one data output. The receiving aerial only needs to be a piece of wire about 25 cm long.

Consider the transmitter and receiver circuits in which a code is transmitted when a button is pressed. At the receiving end an ...

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