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Simple Voltmeter Max 30V Using ATtiny OLED Arduino

Voltmeter ATtiny85 Arduino OLED

Simple Voltmeter Max 30V Using ATtiny OLED Arduino - Hari ini saya mencoba implementasikan ADC sebagai metode ukur tegangan dari 0V hingga 30V DC. Untuk dapat membaca dari 0-30V saya menggunakan resistor pembagi tegangan. Dari hasil pembagian tegangan ini saya konversikan ke nilai tegangan yang akan ditampilkan ke OLED.

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Rangkaian Voltmeter ATiny85 OLED


Progam.

/*
   This basic code from : Pong game by Andy Jackson - Twitter @andyhighnumber
   Edited by chippiko.com
   Volt Meter V0.1
*/

#include "font6x8AJ.h"

#define DIGITAL_WRITE_HIGH(PORT) PORTB |= (1 << PORT)
#define DIGITAL_WRITE_LOW(PORT) PORTB &= ~(1 << PORT)

// Defines for OLED output
#define SSD1306_SCL   PORTB4  // SCL, Pin 4 on SSD1306 Board - for webbogles board
#define SSD1306_SDA   PORTB3  // SDA, Pin 3 on SSD1306 Board - for webbogles board
#define SSD1306_SA    0x78  // Slave address

char buff[10];
String stringVal;


void ssd1306_init(void) {
  DDRB |= (1 << SSD1306_SDA); // Set port as output
  DDRB |= (1 << SSD1306_SCL); // Set port as output

  ssd1306_send_command(0xAE); // display off
  ssd1306_send_command(0x00); // Set Memory Addressing Mode
  ssd1306_send_command(0x10); // 00,Horizontal Addressing Mode;01,Vertical Addressing Mode;10,Page Addressing Mode (RESET);11,Invalid
  ssd1306_send_command(0x40); // Set Page Start Address for Page Addressing Mode,0-7
  ssd1306_send_command(0x81); // Set COM Output Scan Direction
  ssd1306_send_command(0xCF); // ---set low column address
  ssd1306_send_command(0xA1); // ---set high column address
  ssd1306_send_command(0xC8); // --set start line address
  ssd1306_send_command(0xA6); // --set contrast control register
  ssd1306_send_command(0xA8);
  ssd1306_send_command(0x3F); // --set segment re-map 0 to 127
  ssd1306_send_command(0xD3); // --set normal display
  ssd1306_send_command(0x00); // --set multiplex ratio(1 to 64)
  ssd1306_send_command(0xD5); //
  ssd1306_send_command(0x80); // 0xa4,Output follows RAM content;0xa5,Output ignores RAM content
  ssd1306_send_command(0xD9); // -set display offset
  ssd1306_send_command(0xF1); // -not offset
  ssd1306_send_command(0xDA); // --set display clock divide ratio/oscillator frequency
  ssd1306_send_command(0x12); // --set divide ratio
  ssd1306_send_command(0xDB); // --set pre-charge period
  ssd1306_send_command(0x40); //
  ssd1306_send_command(0x20); // --set com pins hardware configuration
  ssd1306_send_command(0x02);
  ssd1306_send_command(0x8D); // --set vcomh
  ssd1306_send_command(0x14); // 0x20,0.77xVcc
  ssd1306_send_command(0xA4); // --set DC-DC enable
  ssd1306_send_command(0xA6); //
  ssd1306_send_command(0xAF); // --turn on oled panel
}

void ssd1306_xfer_start(void) {
  DIGITAL_WRITE_HIGH(SSD1306_SCL);  // Set to HIGH
  DIGITAL_WRITE_HIGH(SSD1306_SDA);  // Set to HIGH
  DIGITAL_WRITE_LOW(SSD1306_SDA);   // Set to LOW
  DIGITAL_WRITE_LOW(SSD1306_SCL);   // Set to LOW
}

void ssd1306_xfer_stop(void) {
  DIGITAL_WRITE_LOW(SSD1306_SCL);   // Set to LOW
  DIGITAL_WRITE_LOW(SSD1306_SDA);   // Set to LOW
  DIGITAL_WRITE_HIGH(SSD1306_SCL);  // Set to HIGH
  DIGITAL_WRITE_HIGH(SSD1306_SDA);  // Set to HIGH
}

void ssd1306_send_byte(uint8_t byte) {
  uint8_t i;
  for (i = 0; i < 8; i++)
  {
    if ((byte << i) & 0x80)
      DIGITAL_WRITE_HIGH(SSD1306_SDA);
    else
      DIGITAL_WRITE_LOW(SSD1306_SDA);

    DIGITAL_WRITE_HIGH(SSD1306_SCL);
    DIGITAL_WRITE_LOW(SSD1306_SCL);
  }
  DIGITAL_WRITE_HIGH(SSD1306_SDA);
  DIGITAL_WRITE_HIGH(SSD1306_SCL);
  DIGITAL_WRITE_LOW(SSD1306_SCL);
}

void ssd1306_send_command(uint8_t command) {
  ssd1306_xfer_start();
  ssd1306_send_byte(SSD1306_SA);  // Slave address, SA0=0
  ssd1306_send_byte(0x00);  // write command
  ssd1306_send_byte(command);
  ssd1306_xfer_stop();
}

void ssd1306_send_data_start(void) {
  ssd1306_xfer_start();
  ssd1306_send_byte(SSD1306_SA);
  ssd1306_send_byte(0x40);  //write data
}

void ssd1306_send_data_stop(void) {
  ssd1306_xfer_stop();
}

void ssd1306_setpos(uint8_t x, uint8_t y)
{
  if (y > 7) return;
  ssd1306_xfer_start();
  ssd1306_send_byte(SSD1306_SA);  //Slave address,SA0=0
  ssd1306_send_byte(0x00);  //write command

  ssd1306_send_byte(0xb0 + y);
  ssd1306_send_byte(((x & 0xf0) >> 4) | 0x10); // |0x10
  ssd1306_send_byte((x & 0x0f) | 0x01); // |0x01

  ssd1306_xfer_stop();
}

void ssd1306_fillscreen(uint8_t fill_Data) {
  uint8_t m, n;
  for (m = 0; m < 8; m++)
  {
    ssd1306_send_command(0xb0 + m); //page0-page1
    ssd1306_send_command(0x00);   //low column start address
    ssd1306_send_command(0x10);   //high column start address
    ssd1306_send_data_start();
    for (n = 0; n < 128; n++)
    {
      ssd1306_send_byte(fill_Data);
    }
    ssd1306_send_data_stop();
  }
}

void ssd1306_char_f6x8(uint8_t x, uint8_t y, const char ch[]) {
  uint8_t c, i, j = 0;
  while (ch[j] != '\0')
  {
    c = ch[j] - 32;
    if (c > 0) c = c - 12;
    if (c > 15) c = c - 6;
    if (c > 40) c = c - 6;
    if (x > 126)
    {
      x = 0;
      y++;
    }
    ssd1306_setpos(x, y);
    ssd1306_send_data_start();
    for (i = 0; i < 6; i++)
    {
      ssd1306_send_byte(pgm_read_byte(&ssd1306xled_font6x8[c * 6 + i]));
    }
    ssd1306_send_data_stop();
    x += 6;
    j++;
  }
}


// Arduino stuff - setup
void setup() {
  ssd1306_init();
  ssd1306_fillscreen(0x00);
  pinMode(A1, INPUT);
}

// Arduino stuff - loop
void loop() {
  // The lower case character set is seriously compromised because I've had to truncate the ASCII table
  // to release space for executable code - hence lower case y and w are remapped to h and / respectively.
  // There is no z in the table (or h!) as these aren't used anywhere in the text here and most of the
  // symbols are also missing for the same reason (see my hacked version of font6x8.h - font6x8AJ.h for more detail)
  ssd1306_char_f6x8(0, 0, "   DC VOLTMETER V1");
  ssd1306_char_f6x8(0, 1,  "---------------------");

  tampilTegangan();
}

void tampilTegangan() {

  //readVal normal nilai arduino
  int readVal = analogRead(A1);
  float val = readVal * 30.0 / 1024.0; //30.0 is maximum voltage read

  stringVal =  String(val, 1);
  stringVal.toCharArray(buff, 5);
  ssd1306_char_f6x8(0, 3, "Voltage");
  ssd1306_char_f6x8(97, 3, buff);
  ssd1306_char_f6x8(120, 3, "V");

  delay(10);
}

font6x8AJ.h

/*
 * SSD1306xLED - Drivers for SSD1306 controlled dot matrix OLED/PLED 128x64 displays
 *
 * @file: font6x8.h
 * @created: 2014-08-12
 * @author: Neven Boyanov
 * 
 * Hacked by andy jackson to allow two games (originally by webboggles.com) to 
 * fit onto an ATTiny85 at the same time - hence several characters are missing
 * and a couple have been moved to limit the amount of software remapping required
 * to map ASCII values onto locations in this array.
 *
 * Source code available at: https://bitbucket.org/tinusaur/ssd1306xled
 *
 */

// ----------------------------------------------------------------------------

#include <avr/pgmspace.h>

// ----------------------------------------------------------------------------

/* Standard ASCII 6x8 font */
static const uint8_t ssd1306xled_font6x8 [] PROGMEM = {
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // sp
/*
  0x00, 0x00, 0x00, 0x2f, 0x00, 0x00, // !
  0x00, 0x00, 0x07, 0x00, 0x07, 0x00, // "
  0x00, 0x14, 0x7f, 0x14, 0x7f, 0x14, // #
  0x00, 0x24, 0x2a, 0x7f, 0x2a, 0x12, // $
  0x00, 0x62, 0x64, 0x08, 0x13, 0x23, // %
  0x00, 0x36, 0x49, 0x55, 0x22, 0x50, // &
  0x00, 0x00, 0x05, 0x03, 0x00, 0x00, // '
  0x00, 0x00, 0x1c, 0x22, 0x41, 0x00, // (
  0x00, 0x00, 0x41, 0x22, 0x1c, 0x00, // )
  0x00, 0x14, 0x08, 0x3E, 0x08, 0x14, // *
  0x00, 0x08, 0x08, 0x3E, 0x08, 0x08, // +
  0x00, 0x00, 0x00, 0xA0, 0x60, 0x00, // ,
  */
  0x00, 0x08, 0x08, 0x08, 0x08, 0x08, // -
  0x00, 0x00, 0x60, 0x60, 0x00, 0x00, // .
  0x00, 0x3C, 0x40, 0x30, 0x40, 0x3C, // w in place of /
  //0x00, 0x20, 0x10, 0x08, 0x04, 0x02, // /
  0x00, 0x3E, 0x51, 0x49, 0x45, 0x3E, // 0
  0x00, 0x00, 0x42, 0x7F, 0x40, 0x00, // 1
  0x00, 0x42, 0x61, 0x51, 0x49, 0x46, // 2
  0x00, 0x21, 0x41, 0x45, 0x4B, 0x31, // 3
  0x00, 0x18, 0x14, 0x12, 0x7F, 0x10, // 4
  0x00, 0x27, 0x45, 0x45, 0x45, 0x39, // 5
  0x00, 0x3C, 0x4A, 0x49, 0x49, 0x30, // 6
  0x00, 0x01, 0x71, 0x09, 0x05, 0x03, // 7
  0x00, 0x36, 0x49, 0x49, 0x49, 0x36, // 8
  0x00, 0x06, 0x49, 0x49, 0x29, 0x1E, // 9
  0x00, 0x00, 0x36, 0x36, 0x00, 0x00, // :
/*
  0x00, 0x00, 0x56, 0x36, 0x00, 0x00, // ;
  0x00, 0x08, 0x14, 0x22, 0x41, 0x00, // <
  0x00, 0x14, 0x14, 0x14, 0x14, 0x14, // =
  0x00, 0x00, 0x41, 0x22, 0x14, 0x08, // >
  0x00, 0x02, 0x01, 0x51, 0x09, 0x06, // ?
  0x00, 0x32, 0x49, 0x59, 0x51, 0x3E, // @
 */
  0x00, 0x7C, 0x12, 0x11, 0x12, 0x7C, // A
  0x00, 0x7F, 0x49, 0x49, 0x49, 0x36, // B
  0x00, 0x3E, 0x41, 0x41, 0x41, 0x22, // C
  0x00, 0x7F, 0x41, 0x41, 0x22, 0x1C, // D
  0x00, 0x7F, 0x49, 0x49, 0x49, 0x41, // E
  0x00, 0x7F, 0x09, 0x09, 0x09, 0x01, // F
  0x00, 0x3E, 0x41, 0x49, 0x49, 0x7A, // G
  0x00, 0x7F, 0x08, 0x08, 0x08, 0x7F, // H
  0x00, 0x00, 0x41, 0x7F, 0x41, 0x00, // I
  0x00, 0x20, 0x40, 0x41, 0x3F, 0x01, // J
  0x00, 0x7F, 0x08, 0x14, 0x22, 0x41, // K
  0x00, 0x7F, 0x40, 0x40, 0x40, 0x40, // L
  0x00, 0x7F, 0x02, 0x0C, 0x02, 0x7F, // M
  0x00, 0x7F, 0x04, 0x08, 0x10, 0x7F, // N
  0x00, 0x3E, 0x41, 0x41, 0x41, 0x3E, // O
  0x00, 0x7F, 0x09, 0x09, 0x09, 0x06, // P
  0x00, 0x3E, 0x41, 0x51, 0x21, 0x5E, // Q
  0x00, 0x7F, 0x09, 0x19, 0x29, 0x46, // R
  0x00, 0x46, 0x49, 0x49, 0x49, 0x31, // S
  0x00, 0x01, 0x01, 0x7F, 0x01, 0x01, // T
  0x00, 0x3F, 0x40, 0x40, 0x40, 0x3F, // U
  0x00, 0x1F, 0x20, 0x40, 0x20, 0x1F, // V
  0x00, 0x3F, 0x40, 0x38, 0x40, 0x3F, // W
  0x00, 0x63, 0x14, 0x08, 0x14, 0x63, // X
  0x00, 0x07, 0x08, 0x70, 0x08, 0x07, // Y
  0x00, 0x61, 0x51, 0x49, 0x45, 0x43, // Z
  /*
  0x00, 0x00, 0x7F, 0x41, 0x41, 0x00, // [
  0x00, 0x55, 0x2A, 0x55, 0x2A, 0x55, // 55
  0x00, 0x00, 0x41, 0x41, 0x7F, 0x00, // ]
  0x00, 0x04, 0x02, 0x01, 0x02, 0x04, // ^
  0x00, 0x40, 0x40, 0x40, 0x40, 0x40, // _
  0x00, 0x00, 0x01, 0x02, 0x04, 0x00, // '
*/
  0x00, 0x20, 0x54, 0x54, 0x54, 0x78, // a
  0x00, 0x7F, 0x48, 0x44, 0x44, 0x38, // b
  0x00, 0x38, 0x44, 0x44, 0x44, 0x20, // c
  0x00, 0x38, 0x44, 0x44, 0x48, 0x7F, // d
  0x00, 0x38, 0x54, 0x54, 0x54, 0x18, // e
  0x00, 0x08, 0x7E, 0x09, 0x01, 0x02, // f
  0x00, 0x18, 0xA4, 0xA4, 0xA4, 0x7C, // g
  0x00, 0x1C, 0xA0, 0xA0, 0xA0, 0x7C, // y (in place of h)
  //0x00, 0x7F, 0x08, 0x04, 0x04, 0x78, // h
  0x00, 0x00, 0x44, 0x7D, 0x40, 0x00, // i
  0x00, 0x40, 0x80, 0x84, 0x7D, 0x00, // j
  0x00, 0x7F, 0x10, 0x28, 0x44, 0x00, // k
  0x00, 0x00, 0x41, 0x7F, 0x40, 0x00, // l
  0x00, 0x7C, 0x04, 0x18, 0x04, 0x78, // m
  0x00, 0x7C, 0x08, 0x04, 0x04, 0x78, // n
  0x00, 0x38, 0x44, 0x44, 0x44, 0x38, // o
  0x00, 0xFC, 0x24, 0x24, 0x24, 0x18, // p
  0x00, 0x18, 0x24, 0x24, 0x18, 0xFC, // q
  0x00, 0x7C, 0x08, 0x04, 0x04, 0x08, // r
  0x00, 0x48, 0x54, 0x54, 0x54, 0x20, // s
  0x00, 0x04, 0x3F, 0x44, 0x40, 0x20, // t
  0x00, 0x3C, 0x40, 0x40, 0x20, 0x7C, // u
  0x00, 0x1C, 0x20, 0x40, 0x20, 0x1C, // v
 // 0x00, 0x3C, 0x40, 0x30, 0x40, 0x3C, // w
 // 0x00, 0x44, 0x28, 0x10, 0x28, 0x44, // x
 // 0x00, 0x1C, 0xA0, 0xA0, 0xA0, 0x7C // y
};

// ----------------------------------------------------------------------------
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