#include #include
#define PCF8591 (0x90 >> 1)
#define AIN0 0x00
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
int Value = 0;

void setup()
{
Wire.begin();
lcd.begin(16,2);
}
void loop()
{
Wire.beginTransmission(PCF8591);
Wire.write(AIN0);
Wire.endTransmission();
Wire.requestFrom(PCF8591, 1);

Value = Wire.read();
lcd.print("ADC Value=");
lcd.print(Value);
delay(500);
lcd.clear();
}