/** =========================================================================
 * RGBsensorAutoMode.ino
 * Example of using the Atlas Scientific RGB sensor modified from
 * code provided by Atlas Scientific: 
 * https://atlas-scientific.com/probes/ezo-rgb-embedded-color-sensor/
 *
 * author: Scott Ensign <ensign@stroudcenter.org>
 * Build Environment: Arduino IDE
 * Hardware Platform: EnviroDIY Mayfly Arduino Datalogger V0.3
 *
 * DISCLAIMER:
 * THIS CODE IS PROVIDED "AS IS" - NO WARRANTY IS GIVEN.
 * 
 * The wiring from the RGB sensor was spliced to a Grove cable as follows:
 * black wire from RGB sensor to black Grove wire to grd on Mayfly D6-7 Grove connection
 * red wire from RGB sensor to red Grove wire to V on Mayfly D6-7 Grove connection
 * white wire from RGB sensor to white Grove wire to D7 on Mayfly D6-7 Grove connection
 * green wire from RGB sensor to yellow Grove wire to D6 on Mayfly D6-7 Grove connection
 * ======================================================================= */

#include <SoftwareSerial.h>                          //include the SoftwareSerial library
#define rx 6                                         //define Mayfly pin 6 (D6) as the receive pin 
#define tx 7                                         //define Mayfly pin 7 (D7) as the transmit pin

SoftwareSerial myserial(rx, tx);                      //define how the software serial port is going to work

String sensorstring = "";                             //a string to hold the data from the Atlas Scientific product
char sensorstring_array[40];

void setup() {                                        //set up the hardware
  Serial.begin(9600);                                 //set baud rate for the hardware serial port_0 to 9600
  myserial.begin(9600);                               //set baud rate for the software serial port to 9600
  sensorstring.reserve(30);                           //set aside some bytes for receiving data from Atlas Scientific product
  pinMode(22, OUTPUT);                                //On the Mayfly Data Logger, pin 22 supplies power to the 
  digitalWrite(22, LOW);
  }

void loop() {                                         //
    digitalWrite(22, HIGH);                           //turn on power to the Mayfly's Grove ports
    delay(500);                                       //wait 500 milliseconds
    myserial.readStringUntil("\r");                   //holds for 1 second; this and the subsequent two commands remove the introductory returns from the RGB sensor
    myserial.readStringUntil("\r");                   //holds for 1 second
    myserial.readStringUntil("\r");                   //holds for 1 second
    myserial.print('R');                              //send that string to the Atlas Scientific product
    myserial.print('\r');                             //add a <CR> to the end of the string
    delay(500);                                       //wait 500 milliseconds
  
int red = myserial.parseInt();                        //myserial.parseFloat is an alternative, but unnecessary here
int green = myserial.parseInt();
int blue = myserial.parseInt();
int lux = myserial.parseInt();

while (myserial.available() > 0) {                    // this gets ride of the "*OK" or anything else trailing at the end
  myserial.read();
}

digitalWrite(22, LOW);                                // turn off power to the sensor

Serial.print("Red: ");                                // print "Red: " to the serial monitor
Serial.println(red);                                  // print the red value from the sensor
Serial.print("Green: ");                              // ...
Serial.println(green);
Serial.print("Blue: ");
Serial.println(blue);
Serial.print("Lux: ");
Serial.println(lux);

  delay(5000);                                        // wait 5000 milliseconds; adjust this value to set the sampling interval for the sensor
}