Trying out various sensors

Author: VariableClass

sensors.ino

@@ -0,0 +1,128 @@
+#include <dht.h>
+
+#define GREEN_PIN 2
+#define BLUE_PIN 3
+#define FAN_PIN 4
+#define DHT_PIN 5
+
+const int WATER_PIN = 0;
+const int PHOTO_PIN = 1;
+const byte numChars = 32;
+char receivedChars[numChars]; // an array to store the received data
+dht DHT;
+
+boolean newData = false;
+
+void setup() {
+
+  // Initialise serial communication
+  Serial.begin(9600);
+
+  // Initialise the output pins
+  pinMode(GREEN_PIN, OUTPUT);
+  pinMode(BLUE_PIN, OUTPUT);
+  pinMode(FAN_PIN, OUTPUT);
+
+  // Initialise the input pin
+  pinMode(DHT_PIN, INPUT);
+}
+
+void loop() {
+
+  recvWithEndMarker();
+  handleDevice();
+}
+
+void handleDevice() {
+
+  if (newData == true) {
+
+    int command = receivedChars[0];
+
+    if (command == 104){
+
+      Serial.print("ARDUINO");
+
+    } else if (command == 108 || command == 102){
+
+      String stringDevice = (String) receivedChars[1];
+      int device = stringDevice.toInt();
+
+      bool state = false;
+      if (receivedChars[2] == '1') {
+
+        state = true;
+      }
+
+      switch (device) {
+
+        case 2:
+          digitalWrite(2, state);
+          break;
+        case 3:
+          digitalWrite(3, state);
+          break;
+        case 4:
+          digitalWrite(4, state);
+          break;
+        default:
+          digitalWrite(2, state);
+          digitalWrite(3, state);
+          digitalWrite(4, state);
+      }
+
+      Serial.print("OK");
+
+    } else if (command == 116){
+
+      int tries = 5;
+      int chk = DHT.read11(DHT_PIN);
+      while (chk != 0 && tries > 0){
+        DHT.read(DHT_PIN);
+        tries--;
+      }
+
+      Serial.print((int) DHT.temperature);
+
+    } else if (command == 112){
+
+      int photoLevel = analogRead(PHOTO_PIN);
+      Serial.print(photoLevel);
+
+    } else if (command == 119){
+
+      int waterLevel = analogRead(WATER_PIN);
+      Serial.print(waterLevel);
+    }
+
+    newData = false;
+  }
+}
+
+void recvWithEndMarker() {
+
+  static byte ndx = 0;
+  char endMarker = '\n';
+  char rc;
+
+  while (Serial.available() > 0 && newData == false) {
+
+    rc = Serial.read();
+
+    if (rc != endMarker) {
+
+      receivedChars[ndx] = rc;
+      ndx++;
+
+      if (ndx >= numChars) {
+        ndx = numChars - 1;
+      }
+
+    } else {
+
+      receivedChars[ndx] = '\0'; // terminate the string
+      ndx = 0;
+      newData = true;
+    }
+  }
+}