// Test for minimum program size.
// Edit AVRI2C_FASTMODE in SSD1306Ascii.h to change the default I2C frequency.

#include "SSD1306Ascii.h"
#include "SSD1306AsciiAvrI2c.h"

// 0X3C+SA0 - 0x3C or 0x3D
#define I2C_ADDRESS 0x3C

// Define proper RST_PIN if required.
#define RST_PIN -1

SSD1306AsciiAvrI2c oled;

float ch1,ch2,ch3,ch4;
int ch01,ch02,ch03,ch04;

void setup() {

#if RST_PIN >= 0
  oled.begin(&Adafruit128x64, I2C_ADDRESS, RST_PIN);
#else // RST_PIN >= 0
  oled.begin(&Adafruit128x64, I2C_ADDRESS);
#endif // RST_PIN >= 0
  // Call oled.setI2cClock(frequency) to change from the default frequency.

  //oled.setFont(System5x7);
  oled.setFont(fixed_bold10x15);

  oled.clear();
  oled.setCursor(0,0);  oled.print("1:       bar");
  oled.setCursor(0,2);  oled.print("2:       bar");
  oled.setCursor(0,4);  oled.print("3:       bar");
  oled.setCursor(0,6);  oled.print("4:       bar");
}

void loop() {
  ch01=analogRead(A0);
  ch02=analogRead(A1);
  ch03=analogRead(A2);
  ch04=analogRead(A3);

  ch1=(375/1023.0)*ch01-75;
  ch2=(375/1023.0)*ch02-75;
  ch3=(375/1023.0)*ch03-75;
  ch4=(375/1023.0)*ch04-75;
  
//oled.setCursor(64,0); oled.print("   ");
  oled.clearField(64,0,3);  oled.setCursor(24,0);  oled.print(ch1,2);
//  oled.setCursor(64,2);  oled.print("   ");
  oled.clearField(64,2,3);  oled.setCursor(24,2);  oled.print(ch2,2);
//  oled.setCursor(64,4);  oled.print("   ");
  oled.clearField(64,4,3);  oled.setCursor(24,4);  oled.print(ch3,2);
//  oled.setCursor(64,6);  oled.print("   ");
  oled.clearField(64,6,3);  oled.setCursor(24,6);  oled.print(ch4,2);

  delay(800);
}