I started on a solderless breadboard, shown below, but those really aren't suited for higher-frequency prototyping and so I was getting stray USB device resets at random (particularly if I inadvertently brushed the ground line while not grounding myself first). I used the components in the SpiffChorder's Digikey bill of materials, including the suggested 9x pull-up resistor SIP array (even though I was only testing with 7 keys). I also chose poorly on a preformed bank of 3 yellow LEDs which were somewhat larger than I expected; their rather rigid leads weren't quite a multiple of 0.1" standard breadboard pitch, causing them to crack superficially upon insertion. I used the excellent AVR ATmegaXX8 Pinout Stickers from Adafruit Industries to more easily keep track of what I was connecting.

SpiffChorder breadboard

back to The Man-Machine...

CCL: ManMachine/KeyerBreadboard (last edited 2012-06-27 03:06:56 by fungi)

CC0 To the extent possible under law, the creator of this work has waived all copyright and related or neighboring rights to it.