/*
This sketch reads three sensors from the Grove Collection:

A0: Temp and Humidity, SEN51035P
A1: Light Sensor, SEN11302P
A2: Rotary Sensor, COM22735P

*/

/*
Base code for RHT03 stolen from https://codebender.cc/sketch:70199
*/
#include <math.h>

double temp;
double humi;

unsigned int loopCnt;

int chr[40] = {0};   // an array is created to store 40 elements
unsigned long xtime;

void setup()
{ 
  Serial.begin(9600);  // Serial port not used
} //end setup

void loop()
{
  // ----------------- temp and humidity sensor------------------
  // Give the "START SIGNAL" to the sensor: LOW + HIGH pulse of specific duration.
  delay(200);// Not less than 200 ms delay for 1 sensor! It can't read faster. (For 2 sensors, :2 !)
  pinMode(A0,OUTPUT);
  digitalWrite(A0,LOW);// send LOW pulse of 20 millis!
  delay(20);
  
  digitalWrite(A0,HIGH);// send HIGH pulse of 40 micros!
  delayMicroseconds(40);
  digitalWrite(A0,LOW);// Go back to LOW and wait for the sensor.
  
  pinMode(A0,INPUT);// Make the signal pin an input and listen to the sensor:
  
  loopCnt=10000;
  
  while(digitalRead(A0) != HIGH)// NOT HIGH: While waiting for the sensor to answer...
  {
      
    if(loopCnt-- == 0)
    {
      Serial.println("NO Signal!");
    }// end if
    
  }// end while
  
  loopCnt=30000;
  
  while(digitalRead(A0) != LOW)
  {
      
    if(loopCnt-- == 0)
    {
      //Serial.println("OK sensor sends data!");
      //Serial.println(" ");
    }// end if
    
  }
  
  // Now receiving data from sensor:
  
  for(int i=0;i<40;i++)// Go through 40 steps: Increment "i" with 1 each time and store the databits in the array "chr".
  {
      
    while(digitalRead(A0) == LOW) // LOW pulses are not interesting...
    {
    // do nothing!
    }// end while
    
    xtime = micros(); // start the timer!
    
    while(digitalRead(A0) == HIGH) // Now look at the HIGH pulses: LONG = 1, SHORT = 0!
    {
        
    }// end while
    
    if (micros() - xtime >50) // If a long HIGH pulse (>50 microseconds) is seen...
    {
      chr[i]=1; // store a "1" in the array "chr"
    }// end if
    
    else // If a short HIGH pulse (<50 microseconds) is seen...
    {
      chr[i]=0; // store a "0" in the array "chr"
    }// end else
    
  }// end for

// Now convert 3 bytes (The 1st, 3rd and 5th) in the array "chr" into (decimal) integers: The sensor output values...

  humi=chr[6]*512+chr[7]*256+chr[8]*128+chr[9]*64+chr[10]*32+chr[11]*16+chr[12]*8+chr[13]*4+chr[14]*2+chr[15]; // Second byte received: This is the humidity (%) *10 (You can leave the first 5 bits out: The number will never become as big...)
  temp=chr[22]*512+chr[23]*256+chr[24]*128+chr[25]*64+chr[26]*32+chr[27]*16+chr[28]*8+chr[29]*4+chr[30]*2+chr[31]; // Second byte received: This is the temperature (°C) *10 (You can leave the first 5 bits out: The number will never become as big...The highest bit is used as + or - sign)

  humi=humi/10; // Divide by 10 to obtain the humidity (%)
  
  if (chr[16]==1) // If highest temp bit = 1 => minus temperature!
  {
   temp=temp/-10; // Divide by -10 to change to minus
  }// end if
    
  else // If highest temp bit = 0 => plus temperature...
  {
   temp=temp/10; // Divide by 10 to obtain the temperature (°C)
  }// end else
  
  // convert to F
  temp = (temp * 1.8) + 32.0;
  
  int itemp = (int) (temp + 0.5);
  int ihumi = (int) (humi + 0.5);
  
  // ----------------- light sensor
  int lightRaw = analogRead(1); 
  float light=(float)lightRaw/1023.0;

  // ----------------- rotary sensor
  int rotVal = analogRead(2);            
  // map it to the range of the analog out:
  int rot = map(rotVal, 0, 1023, 0, 255);  
  rot = rot * 39;
  if(rot<1000) { rot = 1000; }
  
  Serial.print(itemp);
  Serial.print("F, ");
  Serial.print(ihumi);
  Serial.print("%, ");
  Serial.print(light);
  Serial.print("L, ");
  Serial.print(rot);
  Serial.println("R");

  delay(rot);
}// end loop