Hi all,
For my first Arduino project i got hold of the S65 shield and turned it into an oscilloscope. Resolution-wise i get to around 7.7kHz, wich isn't too bad. Since i am mostly into audio processing it still would be nice to get that a little higher, is there any suggestions on how to get the sample rate higher ?
Thanks, Mason
---
#include <S65Display.h>
#include <SDcard.h>
#define FASTADC 1
// defines for setting and clearing register bits
#ifndef cbi
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#endif
#ifndef sbi
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
#endif
S65Display lcd;
#define ANALOG_IN4 4
#define ANALOG_IN5 5
int count = 3;
long previousMillis = 0;
char string[8];
int diff;
int mem4[129];
int mem5[129];
void drawBox(void)
{
lcd.drawLine(2,2,130,2, RGB(255,255,255));
lcd.drawLine(2,2,2,130, RGB(255,255,255));
lcd.drawLine(130,2,130,130, RGB(255,255,255));
lcd.drawLine(2,130,130,130, RGB(255,255,255));
lcd.drawLine(2,66,130,66,RGB(255,255,255));
lcd.drawLine(130,2,132,2,RGB(255,255,255));
lcd.drawLine(130,66,132,66,RGB(255,255,255));
lcd.drawLine(130,130,132,130,RGB(255,255,255));
lcd.drawLine(130,33,132,33,RGB(255,255,255));
lcd.drawLine(130,99,132,99,RGB(255,255,255));
lcd.drawLine(130,16,131,16,RGB(255,255,255));
lcd.drawLine(130,49,131,49,RGB(255,255,255));
lcd.drawLine(130,82,131,82,RGB(255,255,255));
lcd.drawLine(130,115,131,115,RGB(255,255,255));
}
void setup() {
int start ;
int i ;
#if FASTADC
cbi(ADCSRA,ADPS2) ;
sbi(ADCSRA,ADPS1) ;
sbi(ADCSRA,ADPS0) ;
#endif
//init LCD
lcd.init(2);
//clear screen
lcd.clear(RGB(0,0,0));
drawBox();
pinMode(3, OUTPUT);
}
void loop() {
int val4 = analogRead(ANALOG_IN4);
int val5 = analogRead(ANALOG_IN5);
int data4 = (int)(val4 / 16.0f);
int data5 = (int)(val5 / 16.0f);
lcd.drawPixel(count,66,RGB(255,255,255));
lcd.drawPixel(count,66-mem4[count],RGB(0,0,0));
lcd.drawPixel(count,66-data4,RGB(0,200,50));
lcd.drawPixel(count,129-mem5[count],RGB(0,0,0));
lcd.drawPixel(count,129-data5,RGB(0,50,200));
mem4[count] = data4;
mem5[count] = data5;
if (count < 129){
count = count +1;
}
else
{
count = 3;
diff = millis()-previousMillis;
itoa(diff, string, 10);
lcd.fillRect(140, 60, 175, 60+10, RGB(0, 0, 0));
lcd.drawText(140, 61, string, RGB( 255, 255, 255), RGB(0, 0, 0));
itoa(val4, string, 10);
lcd.fillRect(140, 30, 175, 30+10, RGB(0, 0, 0));
lcd.drawText(140, 31, string, RGB( 0, 200, 50), RGB(0, 0, 0));
itoa(val5, string, 10);
lcd.fillRect(140, 92, 175, 92+10, RGB(0, 0, 0));
lcd.drawText(140, 92, string, RGB( 0, 50, 200), RGB(0, 0, 0));
previousMillis = millis();
}
}
