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color_slave_v3.ino

+#include <SPI.h>
+#include <Wire.h>
+
+#define S0 9
+#define S1 8
+#define S2 11
+#define S3 12
+#define sensorOut 10
+
+int frequency = 0;
+int color = 0;
+
+void setup() {
+  Wire.begin(8);
+  Wire.onRequest(requestEvent);
+  Serial.begin(9600); // Initialize serial communications with the PC
+  while (!Serial); // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
+  SPI.begin(); // Init SPI bus
+
+  pinMode(S0, OUTPUT);
+  pinMode(S1, OUTPUT);
+  pinMode(S2, OUTPUT);
+  pinMode(S3, OUTPUT);
+  pinMode(sensorOut, INPUT);
+
+  // Setting frequency-scaling to 20%
+  digitalWrite(S0, HIGH);
+  digitalWrite(S1, LOW);
+}
+
+void loop() {
+  requestEvent();
+  delay(500);
+}
+
+
+
+void requestEvent() {
+  // Custom Function - readColor()
+
+  // Setting red filtered photodiodes to be read
+  digitalWrite(S2, LOW);
+  digitalWrite(S3, LOW);
+  // Reading the output frequency
+  frequency = pulseIn(sensorOut, LOW);
+  int R = frequency;
+  // Printing the value on the serial monitor
+  Serial.print("R= ");//printing name
+  Serial.print(frequency);//printing RED color frequency
+  Serial.print("  ");
+  delay(50);
+
+  // Setting Green filtered photodiodes to be read
+  digitalWrite(S2, HIGH);
+  digitalWrite(S3, HIGH);
+  // Reading the output frequency
+  frequency = pulseIn(sensorOut, LOW);
+  int G = frequency;
+  // Printing the value on the serial monitor
+  Serial.print("G= ");//printing name
+  Serial.print(frequency);//printing RED color frequency
+  Serial.print("  ");
+  delay(50);
+
+  // Setting Blue filtered photodiodes to be read
+  digitalWrite(S2, LOW);
+  digitalWrite(S3, HIGH);
+  // Reading the output frequency
+  frequency = pulseIn(sensorOut, LOW);
+  int B = frequency;
+  // Printing the value on the serial monitor
+  Serial.print("B= ");//printing name
+  Serial.print(frequency);//printing RED color frequency
+  Serial.println("  ");
+  delay(50);
+
+  int sensorValue = analogRead(A3);
+  float voltage = sensorValue * (5.0 / 1024.0);
+
+  float I = voltage / 1000;
+  float VRx = 5 - voltage;
+  float Rx = VRx / I;
+  Rx = (5 - voltage) / I;
+
+  // print out the value you read:
+  Serial.print("Resistance:");
+  Serial.print(Rx);
+  Serial.println(" Ohms");
+
+/*  if (G<400 & G>351 & B<400 & B>351) {
+    color = 1; //Brown
+    if (color == 1 && Rx > 600 && Rx < 1500) {
+      color = 5; // Brown && Attachment greenLED
+    }
+  }*/
+  if (G<8000 & G>351 & B<8000 & B>351) {
+    color = 2; // Green
+    if (color == 2 && Rx > 4000 && Rx < 110000) {
+      color = 6; // Green && Attachment greenLED
+    }
+  }
+  if (G<350 & G>1 & B<350 & B>1) {
+    color = 3; // Yellow
+    if (color == 3 && Rx > 1 && Rx < 3999) {
+      color = 7; // Yellow && Attachment greenLED
+    }
+  }
+/*  if (G<310 & G> & B<209 & B>181) {
+    color = 4; // Orange
+    if (color == 4 && Rx > 200 && Rx < 500) {
+      color = 8; // Orange && Attachment greenLED
+    }
+  }*/
+/*  if (G<23 & G>20 & B<23 & B>20) {
+    color = 9; // Red
+  }
+  if (G<28 & G>24 & B<28 & B>24) {
+    color = 10; // Blue
+  }
+*/
+  Wire.write(color); // respond with message of 6 bytes
+  color = 0;
+}