UV sensor test on IIC LCD

I tested this sensor with uno, and a IIC lcd module using the code (attached in the end), and got these results.

 

Code: Select all#include 
#include 

LiquidCrystal_I2C lcd(0x27, 20, 4);

int ReadUVintensityPin = A0; //Output from the sensor

void setup() {
  lcd.init();
  lcd.backlight();

  lcd.setCursor(0, 0);
  lcd.print("Booting...");
  delay(1000);
  pinMode(ReadUVintensityPin, INPUT);
  Serial.begin(9600); //open serial port, set the baud rate to 9600 bps
  Serial.println("Starting up...");
}

void loop() {
  int uvLevel = averageAnalogRead(ReadUVintensityPin);

  float outputVoltage = 5.0 * uvLevel / 1024;
  float uvIntensity = mapfloat(outputVoltage, 0.99, 2.9, 0.0, 15.0);

  lcd.clear();
  lcd.setCursor(0, 0);
  Serial.print("UV: "); lcd.print("UV: ");
  Serial.print(uvIntensity); lcd.print(uvIntensity);
  Serial.print(" mW/cm^2"); lcd.print(" mW/cm^2");

  Serial.println();
  delay(100);
}

int averageAnalogRead(int pinToRead) {
  byte numberOfReadings = 8;
  unsigned int runningValue = 0;

  for (int x = 0 ; x < numberOfReadings ; x++)
    runningValue += analogRead(pinToRead);
  runningValue /= numberOfReadings;

  return (runningValue);

}

float mapfloat(float x, float in_min, float in_max, float out_min, float out_max) {
  return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}