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Voltmeter Max 30V ATtiny85 OLED Arduino

Voltmeter ATtiny85 OLED

Membuat Voltmeter Sederhana

Voltmeter Sederhana Max 30V Menggunakan ATtiny OLED Arduino - Pada  tutorial ADC yang pernah saya buat (ini dan ini) adalah dasar-dasar yang dapat anda baca kembali.

Pada kali ini saya mencoba implementasikan ADC sebagai metode ukur tegangan dari 0V hingga 30V DC. 


Rangkaian Voltmeter ATtiny85

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

Program Voltmeter ATtiny85

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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