Post by thread:[SX] Changing a value from base2 to base10?

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Steel wrote:I have an ADC that gives me a base2 value (0-FF) and I want to convert it to Base10 (0-9). Is there a more code-efficient way of doing so than what is below?

If ADC_VALUE < 25 Then ADC_VALUE = 0 ELSEIF ADC_VALUE <50 THEN ADC_VALUE = 1 ELSEIF ADC_VALUE <75 THen ADC_VALUE = 2 ELSEIF ADC_VALUE < 100 THEN ADC_VALUE = 3 ELSEIF ADC_VALUE < 125 THEN ADC_VALUE = 4 ELSEIF ADC_VALUE < 150 THEN ADC_VALUE = 5 ELSEIF ADC_VALUE < 175 THEN ADC_VALUE = 6 ELSEIF ADC_VALUE < 200 THEN ADC_VALUE = 7 ELSEIF ADC_VALUE < 225 THEN ADC_VALUE = 8 ELSEIF ADC_VALUE < 255 THEN ADC_VALUE = 9 ENDIF ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=137056 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Beau Schwabe wrote:

Steel, base 2 would be 0 or 1 base 16 would be 0 through F What you are doing with the IF/THEN can be accomplished with simple division. ADC_VALUE = ADC_VALUE / 28 ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=137056#m137061 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Steel wrote:umm...oh yeah...thanks Beau...

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, SSteve wrote: [Quoting: "Beau Schwabe (Parallax)"]What you are doing with the IF/THEN can be accomplished with simple division. ADC_VALUE = ADC_VALUE / 28 Don't you mean ADC_VALUE = ADC_VALUE / 25 ?

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, chiphead wrote:Beau used 28 in order to get the same values as the original code.

I think you could also use 25, but then subtract 1 ADC_VALUE = ADC_VALUE / 25 25 = 1 50 = 2 ... 255 = 10 ADC_VALUE = ADC_VALUE - 1 While Buau uses the magic of integer math to get ADC_VALUE = ADC_VALUE / 28 25 = 0 50 = 1 ... 255 = 9 ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=137056#m137404 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, SSteve wrote: [Quoting: "John R."] ADC_VALUE = ADC_VALUE / 25 Yields the following: 25 = 1 50 = 2 ... 255 = 10 I overlooked values for ADC_VALUE >= 250. So the correct formula would be ADC_VALUE = (ADC_VALUE / 25) MAX 9 [Quoting: "John R."]While Buau uses the magic of integer math to get ADC_VALUE = ADC_VALUE / 28 Yields the following: 25 = 0 50 = 1 ... 255 = 9 I understand the integer math part but I think the "28" in Beau's message is a typo. I've attached the output from this program: ' {$STAMP BS2sx} ' {$PBASIC 2.5} ADC_VALUE VAR BYTE FOR ADC_VALUE = 0 TO 255 DEBUG "ADC_VALUE = ", DEC3 ADC_VALUE, ": /25 = " DEBUG DEC1 (ADC_VALUE / 25) MAX 9 '<-- here's the conversion forumla DEBUG " /28 = ", DEC1 ADC_VALUE / 28, CR NEXT Look at the values for 25, 26, 27, 50, 51, 52, 53, 54, 55, 75, 76, 77, etc. when dividing by 28. They are all incorrect. (I used PBASIC because it was at hand, but the SX/B results should be the same.) ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=137056#m137410 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, chiphead wrote:My bad - I "saw" the lines: ADC_VALUE < 25 Then as ADC_VALUE <= 25 Then Hence my thougths on the 28 and also the using 25 then subtracting 1. Call me an idiot today, and ignore my post. 25 is the correct devisor and I will concurr that Beau had a typo.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Beau Schwabe wrote:Since Steel essentially had a range of 0 to 255 (FF) that needed to be scaled to give an output from 0 to 9...

255 / 9 = 28.33333333333333333 ...I just used '28' ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=137056#m137420 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, chiphead wrote:Can you say "over thinking a solution"? Beau, Thanks for pointing out the obvious to us.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, SSteve wrote:OK. The way I read the original post, he wanted the value to change at every multiple of 25.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Beau Schwabe wrote:

See edit above ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=137056#m137428 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)