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trying to get the crystal changed from 16 Mhz to 20MHz. Followed this approach: http://www.cs.colorado.edu/~buechley/e-textile_kit/e-textile_kit_tech.html cores\wiring\WConstants.h changed as follows… […] // passed in at compile-time #ifndef F_CPU //#define F_CPU 16000000L #define F_CPU 20000000L #endif // passed in at compile-time #ifndef CPU_FREQ //#define CPU_FREQ 16000000L #define CPU_FREQ 20000000L #endif […] arduino-0010-win\arduino-0010\hardware\boards.txt changed (saved the old one […]

so this was an important day…. the set up runs as follows: 1. the visual basic (Vb.Net) application sitting inside the skymap programme sends out a line of data over bluetooth 2. the atmega168 chip, which was programmed on an arduino diecimila board and is now sitting on a separate breadboard, powered by battery, with […]

That’s it. The arduino chip (an ATmega 168) with the minimum life support system to sustain it. It’s basically being powered by 5 volts (taken from 4 x 1.5v AA batteries with suitable reduction and smoothing) with a 16 Mhz crystal to beat time. The idea is that the chip (once programmed on the arduino […]

Having got the parts (the tricky bit), below is the final wiring of an arduino on a breadboard. The battery holder (from maplins) contains 4 x ordinary AA 1.5v batteries. The trick is to keep an eye on this pin-mapping diagram which shows which pins should have what going into them. Here is the finished […]

So, the next requirement is to be able to programme the chip on the arduino diecimila board, then remove that chip, and place it on a breadboard that will be battery-powered and sit on the mount itself. The chip will receive instructions over bluetooth and then process them (eg turn the Altitude stepper motor 100 […]