Oscilloscopio con Arduino....possibile?

International Italiano Software
1

Tra una pescata e l'altra smanetto sempre con l'elettronica. La nuova sfida ora è quella di realizzare un semplice oscilloscopio con Arduino...perchè?...qualcuno ricorderà il kit Magnetoterapia di NE rivista 101-102, vorrei misurare il segnale AF in uscita dal dispositivo. Una frequenza cha genera inpulsi da 8 a 640 Hz. Mi piacerebbe visualizzare tali segnali sul monitor del PC per verificare il funzionamento del disposito. Ho pensato all'oscilloscopio ma se esistesse qualsiasi altro metodo con Arduino ne sarei ben felice!
Grazie

2

L'unica scheda che credo abbia la "potenza" necessaria mi risulta la Zero.
Occhio che sopporta solo tensioni positive superiori a 3.3 volt.

3

.... magari FINO A 3.3V e non superiori :wink:

Guglielmo

4

Credo che qualsiasi scheda con una MCU un po' più veloce dei classici AVR vada bene ... per non parlare delle Teensy :wink:

Guglielmo

5

... vedo che qualche cosa si fa anche con Arduino Nano, guarda QUESTO progetto o cerca su Google per "Arduino Oscilloscope" ... ci sono svariati link interessanti ... :wink:

Guglielmo

6

Siamo in un forum pubblico, non posso esprimere il commento su questo mio "piccolo errore"...

Editando ho fatto casino. :neutral_face:

9

...carino...ma sembra che si "freeza". Nel video vedo che al pigiare il tasto la curva dell'onda rilevata si adatta nel mio prototipo si blocca i codice. Sto usando Arduino Uno e non il Nano
questo è il codice. Dov'è che sbaglio?```

[code]
#include <Wire.h>
#include <U8glib.h>
//U8GLIB_SH1106_128X64 u8g(13, 11, 10, 9);  // SW SPI Com: SCK = 13, MOSI = 11, CS = 10, A0 = 9
//U8GLIB_SH1106_128X64 u8g(4, 5, 6, 7); // SW SPI Com: SCK = 4, MOSI = 5, CS = 6, A0 = 7 (new blue HalTec OLED)
U8GLIB_SH1106_128X64 u8g(U8G_I2C_OPT_NONE); // I2C / TWI
//U8GLIB_SH1106_128X64 u8g(U8G_I2C_OPT_DEV_0|U8G_I2C_OPT_FAST); // Dev 0, Fast I2C / TWI
//U8GLIB_SH1106_128X64 u8g(U8G_I2C_OPT_NO_ACK); // Display which does not send ACK
//U8GLIB_ST7920_128X64_4X u8g(6, 5, 4);
int Input = A0;
int Key_add = 8;
int Key_sub = 9;
int Key_hold = 10;
int x, y;
int i, i1, i2, V_min, V_max, V_mid, t, t0, t1, sta, Key = 1, hold = 0;
long Freq;
float Vpp;
int Y[96];
int Buffer[192];
const uint8_t L[] PROGMEM = {

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0x00, 0x00,
  0x00, 0x0F, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xE0, 0x00,
  0x00, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1C, 0x00,
  0x00, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00,
  0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80,
  0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x60,
  0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20,
  0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10,
  0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10,
  0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x00, 0x00, 0xFF, 0xFC, 0x00, 0x00, 0xC0, 0x01, 0x80, 0x60, 0x00, 0x00, 0x00, 0x08,

  0x10, 0x00, 0x00, 0x00, 0xFF, 0xFC, 0x00, 0x01, 0xC0, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0x00, 0x01, 0xE3, 0xDF, 0xB6, 0x6F, 0x8F, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x00, 0x03, 0x8F, 0xFF, 0x00, 0x01, 0xE3, 0x1B, 0xB6, 0x6D, 0x9B, 0x80, 0x00, 0x08,
  0x10, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0x00, 0x03, 0x33, 0x31, 0xB6, 0x6C, 0xB1, 0x80, 0x00, 0x08,
  0x10, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0x00, 0x03, 0xF3, 0x31, 0xB6, 0x6C, 0xB1, 0x80, 0x00, 0x08,
  0x10, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0x00, 0x06, 0x33, 0x1B, 0xB6, 0x6C, 0x9B, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0x00, 0x06, 0x1B, 0x1F, 0xBE, 0x6C, 0x8F, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x00, 0x03, 0xFE, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x00, 0x03, 0xFF, 0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x00, 0x03, 0xFF, 0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x0C, 0x00, 0x0F, 0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x0C, 0x00, 0x0F, 0xFC, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x0C, 0x00, 0x3F, 0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x0E, 0x00, 0xFF, 0xFF, 0x80, 0x00, 0x00, 0x0F, 0x1E, 0x3C, 0xF8, 0xF0, 0x00, 0x00, 0x08,

  0x10, 0x0E, 0x01, 0xFF, 0xFF, 0x80, 0x00, 0x00, 0x0D, 0x93, 0x6E, 0xCD, 0x90, 0x00, 0x00, 0x08,
  0x10, 0x0F, 0x87, 0xFF, 0xF9, 0x80, 0x00, 0x00, 0x0F, 0x30, 0xC6, 0xCF, 0xF8, 0x00, 0x00, 0x08,
  0x10, 0x0F, 0x87, 0xFF, 0xF9, 0x80, 0x00, 0x00, 0x03, 0xB0, 0xC6, 0xCF, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x0F, 0xFF, 0xFF, 0xF8, 0x00, 0x00, 0x00, 0x0D, 0x9B, 0x6C, 0xCD, 0xB0, 0x00, 0x00, 0x08,
  0x10, 0x0F, 0xFF, 0xFF, 0xF8, 0x00, 0x00, 0x00, 0x07, 0x9E, 0x3C, 0xF9, 0xE0, 0x00, 0x00, 0x08,
  0x10, 0x0F, 0xFF, 0xFF, 0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC0, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x03, 0xFF, 0xFF, 0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC0, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x03, 0xFF, 0xFF, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0xFF, 0xFF, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0xFF, 0xFF, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x7F, 0xFF, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x3F, 0xFF, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x1F, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x07, 0xCF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x07, 0xCF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x07, 0x83, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,

  0x10, 0x00, 0x07, 0x83, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x06, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x07, 0x83, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x07, 0x83, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
  0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10,
  0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10,
  0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20,
  0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40,
  0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x80,
  0x00, 0x60, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0E, 0x00,
  0x00, 0x1E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x70, 0x00,
  0x00, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00



};

void setup( )
{
  pinMode(Key_add, INPUT);
  digitalWrite(Key_add, HIGH);
  pinMode(Key_sub, INPUT);
  digitalWrite(Key_sub, HIGH);
  pinMode(Key_hold, INPUT);
  digitalWrite(Key_hold, HIGH);
  ADMUX = 0x60;
  ADCSRA = 0xe2;
  u8g.setFont(u8g_font_5x7);
  u8g.firstPage();
  do {
    u8g.drawBitmapP( 0, 0, 16, 64, L);
  } while ( u8g.nextPage() );
  delay(2000);
}

void loop( )
{
  sample( );
  Measure( );
  Transform( );
  Key_scan( );
  if (hold == 0)
  {
    u8g.firstPage( );
    do
    {
      draw( );
    }
    while ( u8g.nextPage( ));
  }
}

void sample( )
{ for (i = 0; i < 192; i++)
  {
    Buffer[i] = ADCH;
    switch (Key)
    {
      case 1:
        break;
      case 2:
        delayMicroseconds(4);
        break;
      case 3:
        delayMicroseconds(10);
        break;
      case 4:
        delayMicroseconds(23);
        break;
      case 5:
        delayMicroseconds(60);
        break;
      case 6:
        delayMicroseconds(123);
        break;
      case 7:
        delayMicroseconds(248);
        break;
      case 8:
        delayMicroseconds(623);
        break;
      case 9:
        delayMicroseconds(1247);
        break;
      default: break;
    }
  }
}

void Measure()
{
  V_max = Buffer[0];
  V_min = Buffer[0];
  for (i = 0; i < 192; i++)
  {
    if (Buffer[i] > V_max)
      V_max = Buffer[i];
    if (Buffer[i] < V_min)
      V_min = Buffer[i];
  }
  V_mid = (V_max + V_min) / 2;
  Vpp = (V_max - V_min) * 5 / 255;
  for (i = 0; i < 97; i++)
  {
    if (Buffer[i] < V_mid && Buffer[i + 1] >= V_mid)
    {
      i1 = i;
      break;
    }
  }
  for (i = i1 + 1; i < 98 + i1; i++)
  {
    if (Buffer[i] < V_mid && Buffer[i + 1] >= V_mid)
    {
      i2 = i;
      break;
    }
  }
  t = i2 - i1;
  if (t > 0)
    Freq = 8000 / t;
  else
    Freq = 0;
}

void Transform( )
{
  for (sta = 0; sta < 96; sta++)
  {
    if (Buffer[sta] < 128 && Buffer[sta + 2] > 128)
      break;
  }
  for (i = 0; i < 96; i++)
    Y[i] =  63 - (Buffer[i + sta] >> 2);
}

void draw( )
{
  for (x = 0; x < 95; x++)
    u8g.drawLine(x, Y[x], x, Y[x + 1]);


  u8g.drawFrame(0, 0, 97, 64);

  u8g.drawLine(48, 0, 48, 63);
  u8g.drawLine(0, 32, 96, 32);
  for (x = 0; x < 96; x += 8)
    u8g.drawLine(x, 31, x, 33);
  for (y = 0; y < 64; y += 8)
    u8g.drawLine(47, y, 49, y);

  for (x = 8; x < 96; x += 8)
  {
    for (y = 8; y < 64; y += 8)
      u8g.drawPixel(x, y);
  }

  u8g.drawStr(98, 7, "MS/div");
  u8g.drawStr(98, 23, "V/div");
  u8g.drawStr(98, 30, "0.324");
  u8g.drawStr(98, 40, "Vpp");
  u8g.setPrintPos( 98, 47);
  u8g.print(Vpp);
  u8g.drawStr(118, 47, "V");
  u8g.drawStr(98, 55, "F(HZ)");
  switch (Key)
  {
    case  1:
      u8g.drawStr(98, 14, "0.02");
      u8g.setPrintPos( 98, 62);
      u8g.print(Freq * 50);
      break;
    case  2:
      u8g.drawStr(98, 14, "0.05");
      u8g.setPrintPos( 98, 62);
      u8g.print(Freq * 20);
      break;
    case  3:
      u8g.drawStr(98, 14, " 0.1");
      u8g.setPrintPos( 98, 62);
      u8g.print(Freq * 10);
      break;
    case  4:
      u8g.drawStr(98, 14, " 0.2");
      u8g.setPrintPos( 98, 62);
      u8g.print(Freq * 5);
      break;
    case  5:
      u8g.drawStr(98, 14, " 0.5");
      u8g.setPrintPos( 98, 62);
      u8g.print(Freq * 2);
      break;
    case  6:
      u8g.drawStr(98, 14, "  1");
      u8g.setPrintPos( 98, 62);
      u8g.print(Freq);
      break;
    case  7:
      u8g.drawStr(98, 14, "  2");
      u8g.setPrintPos( 98, 62);
      u8g.print(Freq / 2);
      break;
    case  8:
      u8g.drawStr(98, 14, "  5");
      u8g.setPrintPos( 98, 62);
      u8g.print(Freq / 5);
      break;
    case  9:
      u8g.drawStr(98, 14, " 10");
      u8g.setPrintPos( 98, 62);
      u8g.print(Freq / 10);
      break;
    default: break;
  }
}


void Key_scan()
{
  if (digitalRead(Key_add) == LOW)
  {
    while (digitalRead(Key_add) == LOW);
    Key++;
    if (Key == 10)
      Key = 9;
    delay(10);
  }
  if (digitalRead(Key_sub) == LOW)
  {
    while (digitalRead(Key_sub) == LOW);
    Key--;
    if (Key == 0)
      Key = 1;
    delay(10);
  }
  if (digitalRead(Key_hold) == LOW)
  {
    while (digitalRead(Key_hold) == LOW);
    hold = ~hold;
    delay(10);
  }
}



[/code]
10

@vince59 : in conformità al REGOLAMENTO , punto 7, cortesemente edita il tuo post qui sopra (quindi NON scrivendo un nuovo post, ma utilizzando il bottone a forma di piccola matita :pencil2: che si trova in basso del tuo post), seleziona TUTTA la parte di codice e premi l'icona </> nella barra degli strumenti per contrassegnarla come codice.

Inoltre, così com'è, non è molto leggibile ... assicurati di averlo correttamente indentato nell'IDE prima di inserirlo (questo lo si fa premendo ctrlT su un PC o cmd T su un Mac all'intero del IDE). Per maggiori informazioni ... punto 17.2 del succitato regolamento. Grazie.

Guglielmo

P.S.: Ti ricordo che, purtroppo, fino a quando non sarà sistemato il codice, nel rispetto del suddetto regolamento nessuno ti risponderà, quindi ti consiglio di fare il tutto al più presto. :wink:

11

Buongiorno...avete qualche idea del motivo per cui ilcodice si blocca?

12

Un dubbio....o meglio o un quesito. Ho visto che è possibile utilizzare Arduino per misurare un input analogico e quindi visualizzarlo con lo strumento plotter seriale. A questo punto mi chiedo se con questo semplice "strumento" sia possibile misurare il mio segnale AF 8/170 Hz. In caso positivo,come devo collegare fisicamente il segnale in input? ...direttamente sul pin con gnd comune o devo in qualche modo "manipolarlo"?

13

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