Oversampling analog to digital readings
by
Published on - 15th October 2010 16:51
Number of Views: 9445
Darrel Taylor has a great oversampling include file. This can give you a 10 through 16 bit result from a 10 bit A/D PIC (at the cost of a some micro or milliseconds).
You've probably noticed that when using the Analog to Digital converter, the numbers are NEVER stable. At best, the result will always be bouncing back and forth between two numbers.
While it's extremely annoying, there is a reason for it, and the number of times it bounces between those two numbers is actually indicating the values of more bits of resolution that are not included in the original 10-bit result.
This effect can be exploited to increase the effective number of bits in the result.
By taking a number of consecutive samples and averaging the results with a lower divisor, you can get up to 16-bit accuracy from that poor little 10-bit converter.
http://www.darreltaylor.com/DT_Analog/
An explanation of the Oversampling technique can be found on Wikipedia.
http://en.wikipedia.org/wiki/Oversampling
Re: SERIN2 Receiving Wrong Data
The sending device has the typical 18F4550 USB setup and it is set to "Define OSC 48". The receiving device is set to "DEFINE OSC 16".
rsocor01 Yesterday, 19:56