Practical AVR Microcontrollers by Alan Trevennor

Author:Alan Trevennor
Language: eng
Format: epub
ISBN: 9781430244462
Publisher: Apress

Figure 6-4. DB9 connector, solder side pin ID

For your development rig and test bed, remember that the recommended programmer for use with this book, the Pololu AVR–ISP programmer, features a serial channel that talks in logic levels rather than RS-232 and this can be directly connected to your AVR chip without the need for RS-232 level conversion.

RS-232 or Direct Logic Level Connection?

So, we have a technology choice: but, there are some circumstances where that choice is dictated for us by what we must connect with.

So, just where would we use an RS-232 setup, and where would we just use the programmer’s built-in serial channel? Essentially it is a per-project choice. You would use a full RS-232 setup if

The completed project has to talk directly to a desktop or laptop machine on a regular basis.

You need to debug the project over a long period of time by making it send messages into a larger machine that can store an appreciable archive of messages on a hard drive or some other persistent storage device.

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