Working with a 10 digit number

Jonathan · 2009-04-12 21:59

Hi All,

I'm helping a friend with an art project. It's a cool sounding big installation, and one part of it is a Nixie counter that is tracking the population of the world. So, we need to use a 10 digit number, then shift it out to five 74HC595's. So the question is, how do we increment a 10 digit number, then break it up into nibs?

He has been busting his but to get it done by openeing, which is tomorrow. Last jnight at 4:00 AM he got the nixies working. So help would be much appreciated!

Jonathan

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Mike Green · 2009-04-12 22:09

Easiest thing to do is use a Nibble array like:

counter VAR nib(10)
i VAR nib
carry VAR bit

initialize:
  for i = 0 to 9
    counter(i) = 0
  next
  return

addOne:
  carry = 1
  for i = 0 to 9
    counter(i) = counter(i) + carry
    if counter(i) = 10 then
      counter(i) = 0
      carry = 1
    else
      carry = 0
    endif
  next
  return

SRLM · 2009-04-12 22:11

The most that a BS2 can handle is 16 bits, or some 5 digit numbers, or all 4 digit numbers. My suggestion would be to break it the 10 digit number into 2 + 4 + 4. The 2 and maybe first four will be constant, the last four will change. You'll have to write your own over flow testing routines to increment the next group of numbers (ie, if word 3 > 9999 then word 2 += 1). Mostly, it's straight forward programming.

Jonathan · 2009-04-13 00:42

Perfect Mike! Perfect! Took about two minutes to get working. Thanks!

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www.madlabs.info - Home of the Hydrogen Fuel Cell Robot

Working with a 10 digit number

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