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number conversion

 
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morebudwiser



Joined: 17 Oct 2005
Posts: 26

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number conversion
PostPosted: Fri Jun 27, 2008 4:57 pm     Reply with quote
hi i am reading a 16bit adc and i am reading a value for example 0f 28766 but the last bit is not stable so i want to ignore or strip of the last digit so my reading is 2876 any suggestions please

many thanks Andrew
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Re: number conversion
PostPosted: Fri Jun 27, 2008 5:31 pm     Reply with quote
morebudwiser wrote:
hi i am reading a 16bit adc and i am reading a value for example 0f 28766 but the last bit is not stable so i want to ignore or strip of the last digit so my reading is 2876 any suggestions please...

Even if you strip off the last digit or round off, you still could get an unstable value. 28769..28770 becomes 2876..2877. And if you round off, 28764..28766 becomes 2876..2877. It is inherent in reading analog values that there will always be the chance for some change in a supposedly rock-solid voltage.

Robert Scott
Real-Time Specialties
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PostPosted: Sat Jun 28, 2008 4:42 am     Reply with quote
hi what i want to do is take a 5 digit number say for example 23456 and change it to a four digit number 2345

many thanks andrew
ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Sat Jun 28, 2008 4:48 am     Reply with quote
To cut off the last digit of a decimal value:
Code:
value = value / 10;          // 23456 becomes 2345
Or to remove the last digit with rounding you do:
Code:
value = (value + 5) / 10;    // 23456 becomes 2346
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