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Chapter 6. Wireless Communication > Radio Transceivers - Pg. 192

192 MAKING THINGS TALK Radio Transceivers In many cases, one-way communication isn't enough. For example, you might have noticed in the previous example that sometimes the message doesn't get through, even when you've got the circuitry and the code fully working. In that case, you might want the PC to be able to query the microcontroller occasionally to see the state of the inputs. Or perhaps you're making an application in which there's input and output on both sides. In that case, transceivers are essential. There are many different kinds of data transceivers on the market. Some connect directly to the serial I/O of the microcontroller and send the data as is. Some, like the Bluetooth module you saw in Chapter 2, add an additional protocol layer on top of the data communication, so you have to be able to implement that protocol on both sender and receiver. The cost of transceivers varies widely. next project will do the same, and much more, as you'll see in Chapter 7. These particular transceivers are in the same general price range as the plain serial transceivers mentioned earlier. They require you to learn a bit more in terms of networking protocols, but the benefits you gain make them well worth that minor cost.