/*

http://www.bristolwatch.com/arduino/arduino_tsl230r.htm
TSL230R Light to Frequency Converter and Arduino
Lewis Loflin lewis@bvu.net
This code comes with no warrenty

*/


/* Program 1
Make sure these libraries
are present. This uses an
I2C LCD display.
*/

#include <OneWire.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
// set the LCD address to 0x27

#define S0 11
#define S1 12
#define S2 5
#define S3 6
#define pulsePin 4

unsigned long pulseCount;
unsigned int val;

void setup() {
  lcd.init(); // initialize the lcd
  lcd.backlight();
  //  Serial.begin(9600);
  pinMode(S0, OUTPUT); // to S0
  pinMode(S1, OUTPUT); // to S1
  pinMode(pulsePin, INPUT);  // freq input
  pinMode(S2, OUTPUT);  // to S2
  pinMode(S3, OUTPUT);  // to S3

  /* set sensitivity
   S1    S0    sensitivity
   L     L     power down
   L     H     1X
   H     L     10X
   H     H     100X
   Higher sensitivity creates
   higher frequency out.
   */

  digitalWrite(S1, 1);
  digitalWrite(S0, 1);

  /* Frequency divide
   S3     S2          (divide-by)
   L      L              1
   L      H              2
   H      L              10
   H      H              100    */

  digitalWrite(S3, 1);
  digitalWrite(S2, 1);
} // end setup

void loop() {

  pulseCount = pulseIn(pulsePin, HIGH);
  val = pulseCount * 2; // get the period
  // play with 900000 for better accuracy
  val = 900000 / val;

  lcd.print("Freq = ");
  lcd.print(val);
  lcd.println(" Hz       ");
  delay(500);
  //  lcd.clear();
  lcd.home();
} // end loop