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CVD mtouch by using 16f877a

 
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winky4110



Joined: 05 Nov 2010
Posts: 1

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CVD mtouch by using 16f877a
PostPosted: Fri Nov 05, 2010 12:53 pm     Reply with quote
I am trying to make a capacitive push button by using 16f877a. According to the Microchip application note (AN1298), most of the devices which have adc can be used. I used lcd to show the value of adc but the result was randomly jump between 0 to 5v (abnormal).

Here is my coding:
Code:

#include <16F877A.H>
#device adc=10
#fuses XT, NOWDT, NOPROTECT, NOBROWNOUT, NOPUT, NOLVP
#use delay(clock=4000000)
#include "flex_lcd.c"
#byte adcon0=01F

//============================
void main()
{
   int16 adc_value;
   float volts;
 
   lcd_init();
   output_low(pin_a0);
   delay_us(100);
   set_tris_a(0b11111111);
   setup_adc_ports(AN0_AN1_AN3);
   setup_adc(ADC_CLOCK_DIV_32);

while(true)
 {
   adcon0=0b10001001;
   delay_us(100);
   adcon0=0b10000001;
   delay_us(20);
   adc_value = read_adc();
   volts = (float)(adc_value * 5)/1023.0;   
   printf(lcd_putc, "\f%3.2f", volts);
   delay_ms(50);   
 }
}

Pin AN1 was connected to Vdd.
Pls help....Thx!!!
ran2rg



Joined: 02 Aug 2011
Posts: 6

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did it worked?
PostPosted: Wed Aug 03, 2011 4:05 am     Reply with quote
HI
Did your code work ?
Can you post it if it did ?

I did something similar to yours and it does not work.
This method seems to me as almost impossible, because the SNR between changes are so small relative to noise.
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