revolution counter

[skimask]

I have light to voltage chip,

That's a SOLAR CELL!

reading the encoder, the encoder is divided into 4 sections, 2 white and two black, read black show ADC below 127 and white ADC above 127.

I get the feeling you might end up making a small program just to test the ability of your sensor to read the black/white patches in the first place rather than assuming your sensor/PIC will read everything the way you hope it will. Something like this:

........setup.........
ledout var port...some port here
main: adcon0.2=1 'Start Conversion
waitonadc: if adcon0.2 = 1 then waitonadc
oldoutput_pot = adresh *256 + adresl
if oldoutput_pot > 127 then
     ledout = 1
else
     ledout = 0
endif
goto main

Change the value 127 above to find a 'trip point' for the counter itself.
See what happens with that. If that works for you, then you should be all set.
(Also, you may want to check the manual for your use of the ADCIN command)

[Acetronics2]

That's a SOLAR CELL!

Not compulsory ...

OPB 608/704 / CNY 70 i.e. are reflective Opto-couplers ...

Alain

[lerameur]

I just want to count the revolution, so even if the trip point is not on the 'dot' it do not matter. What matters here is that I want to be able to calculate the transitions from black to white and white to black. After four transistions I get a revolution .
The problem in my program is that it is not showing anything on the LCD.

ken

[lerameur]

crap.. I forgot to define my ADC:

Define ADC_BITS 8 ' Set number of bits in result
Define ADC_CLOCK 3 ' Set clock source (3=rc)
Define ADC_SAMPLEUS 50 ' Set sampling time in uS

ken

[mackrackit]

crap.. I forgot to define my ADC:

Define ADC_BITS 8 ' Set number of bits in result
Define ADC_CLOCK 3 ' Set clock source (3=rc)
Define ADC_SAMPLEUS 50 ' Set sampling time in uS

ken

So it is working now???

[lerameur]

I dont know if it works, I m at work now, I will see when I get home tonight

skimask, what do you mean by tripping?
:is this it...

ADCON0.2 = 1 'Start Conversion
ADCIN 1, Output_Pot 'analog pin 1 (RA1) get the 8 bit result

[skimask]

Ok, I see there's 2 places where I could be 'tripping' !

1st tripping - by that I mean the point where the ADCIN routine distinguishes between the light and dark area of the disc.

2nd tripping - Do you see this phrase anywhere in the manual?

ADCON0.2 = 1 			'Start Conversion

I.E. YOU don't need to start the A/D conversion, ADCIN does that for you.

[skimask]

I just want to count the revolution, so even if the trip point is not on the 'dot' it do not matter. What matters here is that I want to be able to calculate the transitions from black to white and white to black. After four transistions I get a revolution .
The problem in my program is that it is not showing anything on the LCD.

Right, but if it's not tripping in the first place, you won't get any counts in the last place...
And the ADC, yes, that's part of it. The other part is 'starting' the ADC itself.

[mackrackit]

The problem in my program is that it is not showing anything on the LCD.

Or is this the problem

DEFINE LCD_BITS 4 ' Set LCD bus size (4 or 8 bits) '4 therefore put wire at 4, 5, 6 and 7 of LCD