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weg22
Joined: 08 Jul 2005
Posts: 91
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| Help with GP2D12.c driver |
 Posted: Wed Nov 15, 2006 5:05 pm |
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Hi all,
I previously posted a message on how to read a voltage value with the A/D pin on a PIC18F8722:
http://www.ccsinfo.com/forum/viewtopic.php?t=28884
In the meantime, I came across a driver for the for the IR sensor I am using (different model, but exactly the same output -> 0.5-2.8 volts). I incorporated that into my code and also changed the LEFT_ADC_CHANNEL value to 0, but I'm still not getting the expected value. With a range of 0.5-2.8 volts, I'm expecting digital values from 26-143...but I'm actually seeing around 190-220. If anyone could offer advice, I'd appreciate it. Maybe the ADC just isn't working on my PIC?
| Code: |
#include <18F8722.h>
#device adc=8
#include <stdlib.h>
#include <math.h>
#fuses HS,NOWDT,NOPROTECT,PUT,NOLVP
#use delay(clock=10000000)
#use rs232(baud=9600, xmit=PIN_G1, rcv=PIN_G2, stream=PC)
#include <GP2D12.c>
main()
{
int value=0;
init_objectSensors();
while(1)
{
value = read_leftObjectSensor();
fprintf(PC, "%u\r\n", value);
}
} // end of main |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Nov 15, 2006 5:27 pm |
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You didn't have to start a whole new thread. If you add a post to an
existing thread, it will be "bumped" to the top of the list. Everyone will
see it.
| Quote: | | In the meantime, I came across a driver for the for the IR sensor |
You're referring to this CCS driver:
c:\program files\picc\drivers\gp2d12.c
The CCS driver defaults to using A/D channel 1:
| Code: | | #define LEFT_ADC_CHANNEL 1 |
But your hardware in your previous thread was setup to use channel 0:
| Code: | | set_adc_channel(0); |
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weg22
Joined: 08 Jul 2005
Posts: 91
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| Re: Help with GP2D12.c driver |
| Posted: Wed Nov 15, 2006 7:38 pm |
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| weg22 wrote: |
I incorporated that into my code and also changed the LEFT_ADC_CHANNEL value to 0, but I'm still not getting the expected value.
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I already changed that before posting this thread. |
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