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Arduino - Python Communication/sensorJSON.ino

+/*
+ * This code takes care of the Ultrasonic and PIR motion sensor.
+ * It calculates the distance and also checks status of the PIR motion sensor.
+ * It sends a JSON string to the Serial Port
+ * Here, it is assumed that trigPin = 9, echoPin = 10.
+ * The PIR input is taken through pin 8
+ * Change the pins accordingly
+ *  - Shrishailya Agashe
+ */
+
+
+
+#include <Arduino_JSON.h>
+
+//Function that calculates the distance form Ultra Sonic Sensor in cm.
+long getUlrasonicDistance(int trigPin, int echoPin){
+   long duration, cm;
+   pinMode(trigPin, OUTPUT);
+   digitalWrite(trigPin, LOW);
+   delayMicroseconds(2);
+   digitalWrite(trigPin, HIGH);
+   delayMicroseconds(10);
+   digitalWrite(trigPin, LOW);
+   pinMode(echoPin, INPUT);
+   duration = pulseIn(echoPin, HIGH);
+   cm = duration /29 /2;
+
+   return cm;
+}
+
+//Function that returns the status of PIR Sensor.
+int getPIRStatus(int PIRPin){
+  pinMode(PIRPin, INPUT);
+  
+  if(digitalRead(PIRPin) == 0){
+    return 0;
+  }
+  else{
+    return 1;
+  }
+}
+
+
+void setup() {
+  //Begin Serial Communication
+  Serial.begin(115200);
+}
+
+void loop() {
+  //Create object to store items like a python dictionary
+   JSONVar myObject;
+
+   //Set the values as needed.
+   myObject["US"] = getUlrasonicDistance(9,10);
+   myObject["PIR"] = getPIRStatus(8);
+
+   //Convert the JSON object to a JSON string
+   String jsonString = JSON.stringify(myObject);
+
+   //Send the string through Serial port.
+   Serial.println(jsonString);
+
+   //100ms delay
+   delay(1000);
+}