AD problems

[mister_e]

we don't know much about your external analog source but assuming a 10K, the ADC sampling time is way too low. Use my PicMultiCalc to know the right value for your actual setup.

Here if i use 10K, the DEFINEs will be...

DEFINE ADC_BITS 10     ' ADCIN resolution  (Bits)
DEFINE ADC_CLOCK 2     ' ADC clock source  (Fosc/32)
DEFINE ADC_SAMPLEUS 11 ' ADC sampling time (uSec)

now...

MER1=MERITEV1/112
MER1Y=MERITEV1//112
MER1X=(MER1Y*10)/112

MER2=MERITEV2/112
MER2Y=MERITEV2//112
MER2X=(MER1Y*10)/112

to me it's suppose to be MER2Y

ADCON1=%10010111

i don't see this setting in the datasheet... for now, it make all pins to digital.

i did the test with ADCON1=%10000000
and it works.. well here

[Bruce]

And, based on your analog pin assignments;

ANALOG1 VAR PORTA.0 'ANALOGNI VHOD1
ANALOG2 VAR PORTA.1 'ANALOGNI VHOD2
ANALOG3 VAR PORTA.3 'ANALOGNI VHOD3

If you change ADCON1=%10010111 to ADCON1=%10000100, that would
set RA0, RA1 and RA3 up as analog inputs to match. Assuming analog Vref
is Vdd & Vss.

[Samoele]

Thank you for your help. It is working now.

Samo