adcon problems with adcin

[mbw123]

Hello everyone,

I have a simple question: I am trying to use the adcin command to get input from a pot source on a 18F4550. I am hacing problems with the defines and setting it up. I assume I want to use "DEFINE ADC_BITS 10" but I am unsure about what else I should do.

DEFINE ADC_SAMPLEUS 10 '(or 50?) What exactly is this?
DEFINE ADC_CLOCK 3 'I am assuming I should use this because I am using a crystal?

And the biggest mystery...the adcon.

I looked at the datasheet for the PIC18F4550 on adcon1 and I don't really understand it. Can anyone help me here or give me a link to a web page or something? Thanks for your help.

-Mike

[mister_e]

Wich channel you want to read?

Wich OSC speed?

[mbw123]

I would like to read all channels. And I am using a 20mHz crystal, although I know I need a DEFINE OSC 20 for that. What I don't understand is how to read the tables in the datasheet and how to set the defines for adcon and adcin. Thank you for your response.

-Mike

[mister_e]

OK then, so you're not going to use the USB feature in?

Let me know, i have some spare time today... to be honest, i'm out of solution to fix my actual Projects bugs.... ARRGGHHHH! Seems i need a break ;)

[Pesticida]

Hi,
I use this:

DEFINE OSC 4
DEFINE ADC_BITS 8
DEFINE ADC_SAMPLEUS 50
' Set clock source (3=rc)
DEFINE ADC_CLOCK 3


......................

for counter2 = 0 to 7
SUM = 0
FOR COUNTER1 = 1 to 10

ADCIN counter2,A[counter2]

PAUSEUS 24 'Pause between ADCINs

SUM = SUM + A[counter2]

NEXT COUNTER1

A[counter2] = SUM/10


And is working very good.

Regard.

[mbw123]

I might use the USB feature... I don't know if I need the feature right now though.

I think I will use this code...but are the adc_bits and adc_sampleus numbers arbitrary?

DEFINE OSC 4
DEFINE ADC_BITS 8
DEFINE ADC_SAMPLEUS 50
' Set clock source (3=rc)
DEFINE ADC_CLOCK 3

And mister_e I could use your expertise on a few questions: I am using an infrared emitter and the strength of that beam will be measured by an infrared receiver (which will be measured with the adcin command). However, I cannot seem to find an infrared receiver. Do you know of any online stores that sell them?

The other thing I need are really cheap gearhead motors. Any suggestions?

Last question: If I do end up using the USB feature, what software could I use to receive USB data (or should I write my own) which I can then process?

I appreciate your help and wish you luck with your own projects.

-Mike

[mbw123]

Does anyone have a link or know of an article about this where I could go to?

-Mike