Maximum value of ADCIN

[rsocor01]

Fratello,

The result should be in mVolts.

[Darrel Taylor]

You almost had it right Fratello.
And the timing will be more accurate if you don't do the math on each loop.

vmax = 0
for cnt=1 to 70       			
    adcin 3, v_cal
    vmax=vmax max v_cal
    pause 100
next cnt
v_cal=vmax * 5000            ' I use VDD as Vref
v_cal=div32 1023

[fratello]

Thank You all for reply !
Both variant (mine = 0 max v_cal and variant of Mr.Robert ) give me the same results : 24 .
According of my math, I think this is the value of 24 mVolts. I am right ?
Now I try the variant of Mr.Darrel (remember ? My guardian angel in PBP problems ...).
I post the results.
LE : Something strange...with this variant, I read only 5 mV ?!
Maybe the schematic help...

[rsocor01]

Oops, disregard my comment. Yes, you should get your result in millivolts.

Robert

[fratello]

Tested and re-tested today both variant : Mr.Darrel's and Mr.Aratti.
Still different results : 5mV vs. 24 mV. It's so strange for me...

[Darrel Taylor]

fratello,
I'm not sure what you've done in your code, but I've tested it here and it works.

<object id='stUkhdQ01IR1FWRltYU1tYUVNR' width='425' height='344' type='application/x-shockwave-flash' data='http://www.screentoaster.com/swf/STPlayer.swf' codebase='http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,115,0'><param name='movie' value='http://www.screentoaster.com/swf/STPlayer.swf'/><param name='allowFullScreen' value='true'/><param name='allowScriptAccess' value='always'/><param name='flashvars' value='video=stUkhdQ01IR1FWRltYU1tYUVNR'/></object>

[fratello]

Wow, Thank You again Mr.Darrel !
Maybe my code it's wrong ; I use

DEFINE OSC  4
DEFINE ADC_BITS 10
DEFINE ADC_CLOCK 3
DEFINE ADC_SAMPLEUS 50

instead

DEFINE ADC_BITS 10     ' ADCIN resolution  (Bits)
DEFINE ADC_CLOCK 1     ' ADC clock source  (Fosc/8)
DEFINE ADC_SAMPLEUS 11 ' ADC sampling time (uSec)

This is the explanation, don't ?
NO, I think this is NOT the explanation ! My math teacher it's verry, verry angry ...
I learn more here : http://www.darreltaylor.com/DT_Analog/
1 step=0.0048875. So, if I have Max_result 450, Volts= 450 * 0.0048875 =2.199 Volts; for 696 --> Volts= 696 * 0.0048875 =3.401 Volts...
Stupid me, again