Notes

Experiment 8

part1:Read Analog input (0 to +5V)
and display its value (0 to 1023)

*Read the input voltage 2 (0; +5V )
incoming to pin AN0 (RA0) and display
the voltage as an integer between 0 and
1023 on two LED-bargraphs connected to
ports C (least signiffcant) and D
(most signiffcant).

-------
ISIS:
RA0:potentionmeter to above VCC
and below to gnd.

RC0 to RC7: respack(220)to ledbargraph
(pin9&10 out)and to other hand
from (pin 20 to 13 to gnd//pin11 and
12 out ).


RD0 to RD7:respack(220)to ledbargraph
(pin9&10 out)and to other hand
from (pin 20 to 13 to gnd//pin11 and
12 out ).

-----
code :

#include "ee445.h"
void main(void)
{
OSCCON=0x73;
ADCON1 = 0xE;
TRISC=0;
TRISD=0;
TRISA0=1;
ADCON0 = 0x1;
ADCON2 = 0xAE;
while(1) {
__delay_ms(1);
GO = 1;
while(GO == 1);
PORTC=ADRESL;
PORTD=ADRESH;
__delay_ms(50);
}
}
#############
part2: Temperature measurement
using LM35


ISIS:
RA0: to potentionmeter
above to VCC and below to gnd

pin25:to V.termintor(Rxd)
pin26:to V.terminator(Txd)

RD0 to RD7:to Led=Bargraph
(pin 9&10 out)to Respack330(pin9 to gnd)

--------
code:
#include "ee445.h"
void main(void)
{
unsigned int vin0, vin01;
OSCCON=0x73;
serial_init(51,1);
ADON=1; CHS0=0; CHS1=0;
CHS2=0; CHS3=0;
PCFG0=0; PCFG1=1; PCFG2=1;
PCFG3=1; VCFG1=0; VCFG0=0;
ADFM=1; ACQT2=1; ACQT1=1;
ACQT0=1; ADCS2=1;
ADCS1=1; ADCS0=0;
TRISD=0;
for(;;)
while(GO==1);
vin0=(ADRESH<<8)+ADRESL;
vin01=ADRES;
printf("Input: decimal =%d, %d analog voltage = %f Temp.=%frn",
vin0, vin01, vin0*5.0/1023.0, (vin0*5.0/1023.0)/(10e-3));
PORTD= (unsigned char) ((vin0*5.0/1023.0)/(10e-3));
}
}
###########
part3: digital to analog
converter
----
ISIS:
RA0: with signal generator(sin)
and (squ)to gnd.

RD0 to RD7: to resistor network1 then
to resistor network2 (these pins :
16 with 2
15 with 3
14 with 4
13 with 5
12 with 6
11 with 7
10 with 8
9 out )))
and in RN2(pin1 to 2K to gnd)
and in RN2(pin8 to Osclliscope A)
-----
code:
#include "ee445.h"
void main(void)
{
unsigned int vin0;
unsigned char vout;
OSCCON=0x73;
serial_init(51,1);
ADON=1; CHS0=0; CHS1=0; CHS2=0; CHS3=0;
PCFG0=0; PCFG1=1; PCFG2=1; PCFG3=1; VCFG1=0; VCFG0=0;
ADFM=1; ACQT2=1; ACQT1=1; ACQT0=1; ADCS2=1; ADCS1=1; ADCS0=0;
DDRD=0;
for(;;)
{
GO=1;
while(GO==1);
vin0=(ADRESH<<8)+ADRESL;
vout=vin0>>2;
PORTD= vout;
}
}
#############
part4:Function generator

------
ISIS:
RA0: 10K to VCC then switch to gnd
RA1:10K to VCC then switch to gnd
RA2:10K to VCC then switch to gnd
RC0:led to res=220 to gnd
RD0 to RD7: to resistor network1 then
to resistor network2 (these pins :
16 with 2
15 with 3
14 with 4
13 with 5
12 with 6
11 with 7
10 with 8
9 out )))
and in RN2(pin1 to 2K to gnd)
and in RN2(pin8 to Osclliscope A)



-------
code:
#include "ee445.h"
#include <math.h>
#define pi 3.14159265359
#define Ns 80
#define fs 400
#define f 50
unsigned char SQ[Ns];
unsigned char TR[Ns];
unsigned char SI[Ns];
unsigned char count=0, signal_type;
void interrupt timer_isr(void)
{
unsigned char tmp;
if(signal_type == 0) tmp = 0;
if(signal_type == 1) tmp = SQ[count];
if(signal_type == 2) tmp = TR[count];
if(signal_type == 3) tmp = SI[count];
PORTD = tmp;
count = count + 1;
if(count == Ns) count = 0;
TMR2IF = 0;
RC0=RC0^1;
}
void Timer2_Init(void)
{
T2CON = 0x4C;
PR2 = 49;
TMR2IE = 1;
PEIE = 1;
}
void Lookup_Init(void)
{
unsigned char i;
float tx;
for(i=0;i<Ns;i++)
{
if(i<Ns/2)
{
SQ[i]=0xFF;
TR[i]=(unsigned char) (i*480/Ns);
}
else if(i>=Ns/2)
{
SQ[i]=0x00;
TR[i]=(unsigned char) ((Ns-i)*480/Ns);
}
tx = (1.0+sin(2.0*pi*f*i/fs))*127.0;
SI[i] = (unsigned char) tx;
}
}
void wait(void)
{
unsigned char x;
for (x=0; x<20; x++) {__delay_ms(50);}
}
void main (void)
{
unsigned char temp, i;
OSCCON=0x73;
ADCON1 = 0x0F;
TRISA = 0xFF;
TRISD = 0x00;
TRISC0=0;
RC0=1;
count = 0;
signal_type = 0;
Lookup_Init();
Timer2_Init();
GIE = 1;
while(1)
{
wait();
temp = PORTA;
if((temp == 0x01) || (temp == 0x02) || (temp == 0x04))
{
if((temp & 0x01) == 0x01)
signal_type = 1;
if((temp & 0x02) == 0x02)
signal_type = 2;
if((temp & 0x04) == 0x04)
signal_type = 3;
}
else signal_type = 0;
}
}