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Extra info for Circuit Cellar September 2010

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Com 5_Layout 1 5/12/2010 8:27 AM Page 1 What is the missing component? Electronics instructor Ollie Circuits planned to show his class of freshman electrical engineering students how to use a super capacitor as a memory back-up capacitor, but first he wanted to show how the students could make their own super capacitor and demonstrate its charge/discharge cycles with the simple circuit above. The stacked layers would then be sandwiched between the two copper-clad PC boards and held together with a rubber band.

I’ll answer that question. But before I do, I’ll briefly explain the mbed concept. At first glance, an mbed module looks like any other microcontroller evaluation board. 1”), and there isn’t much on the board other than the processor, five LEDs, a push button, and a USB connector. If you flip over the board, you’ll discover a second processor, a DB83848 Ethernet transceiver, and an Atmel AT45DB161 16-Mb serial flash memory chip. The second processor, an LPC2148 ARM7 (rebranded as “mbed interface” on the current LPC1768 module), is almost as powerful as the main processor, and this is where the innovate bit lies.

Of course, you can reverse-engineer the executable or inspect the registers, but that takes the “rapid” out of the concept. Also, when the library is updated, you may have to do it all over again. And while I’m in critical mode, let me also mention that the board’s blue ON TO THE APPLICATION My goal for this project was to build a message board that makes it easy to display information. Today, the word “easy” often equates to USB, which is why I ended up using the mbed module. The module doubles as a 2-MB USB mass-storage device, so I knew it would be easy to load message files on it that I created on a computer with a proper text editor.

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