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Coin cell backup not working. Pull-down resistor not pulling its weight?
I have a clock that uses a ATMega328 and a MAX7219 8 digit display driver. See attached schematic. I am attempting a battery backup method based on the one used by the AVR...
Thursday, 18 September 2014 - 23:39
Bit Assignment Puzzle
I am working with an LED array and I need to combine every other bit in the source variable and assign those bits to a second destination variable. See attached picture I am using...
Tuesday, 5 August 2014 - 14:00
Unplug your STK500 ISP Cable when not in use
I just spent many hours trying to track down why some of my Mega168 port B pins were acting strangely. Even if the programmer is turned off unusual behavior can happen if you don'...
Wednesday, 19 December 2007 - 18:19
Newbe CAST questions
The C books I have all gloss over casting, giving examples on how to "cast" up but not how to cast down. Casting up: long_num = (long)int_num * 100; But what about: char_num =...
Thursday, 22 February 2007 - 21:42
Persistence of variables declared within a function
The easiest way for me to learn something by reviewing what others have done. This is the first few lines from a function pulled from Martin Thomas' port of the Butterfly...
Thursday, 15 February 2007 - 20:37
Advice needed for alarm clock project
My friend has a child with developmental problems and would like to see if a visual countdown timer will help their child get a better grasp on time. They would like a row of LEDs...
Wednesday, 24 January 2007 - 19:47