added arduino files

proximityAlarm.ino

@@ -0,0 +1,108 @@
+/*
+  Inspectio
+
+  Detects objects on the left and right of a person wearing the belt and signals them
+  when objects are close by
+
+  circuit:
+  - 1, 8 ohm speaker on digital pin 8
+  - #, ultrasonic sensors
+
+  created 20 Oct 2019
+  by Blue Wall Peeps
+
+  https://github.com/CSBar/HackUMass19
+*/
+// program parameters
+const int minDistance = 70; //farthest object distance that will trigger a beep
+const int numOfSensors = 2; //number of functional sensors connected
+
+typedef struct sensor {
+  int trigPin;
+  int echoPin;
+} sensor;
+
+// defines pin numbers
+const sensor sensorList[numOfSensors] = {{8, 7}, {3,2}};
+const int buzzer = 13;
+
+enum direction {
+  LEFT,
+  RIGHT
+};
+
+
+/*
+ * Has the specified sensor scan for nearby objects
+ * @param ultrasonicSensor - specified sensor with valid trigPin and echoPin connected to arduino
+ * @return distance (in cm) of the nearest object detected by the sensor
+*/
+int detectNearestObject(sensor ultrasonicSensor);
+
+/*
+ * Sends a signal to the speaker to play specified sounds
+ * Discriminates left and right sensor signals and sounds more frequently when objects are closer to the sensor
+ * @param direction - whether the sensor sending a signal is from the left or right side of the person
+ * @param distance - distance (in cm) of the nearest object detected by the sensor
+ * @return NOTHING
+*/
+void playBuzzerSound(int direction, int distance);
+
+
+void setup() {
+  for(int i=0; i<numOfSensors; i++) {
+    pinMode(sensorList[i].trigPin, OUTPUT); // Sets each trigPin as an Output
+    pinMode(sensorList[i].echoPin, INPUT); // Sets each echoPin as an Input
+  }
+  pinMode(buzzer, OUTPUT); // Sets the buzzer as an Output
+  Serial.begin(9600); // Starts the serial communication
+}
+
+void loop() {
+  for(int i=0; i<numOfSensors; i++) {
+    int distance = detectNearestObject(sensorList[i]);
+    if(distance < minDistance)
+      playBuzzerSound(i % 2, distance);
+  }
+}
+
+
+int detectNearestObject(sensor ultrasonicSensor) {
+  // Clears the trigPin
+  digitalWrite(ultrasonicSensor.trigPin, LOW);
+  delayMicroseconds(2);
+
+  // Sets the trigPin on HIGH state for 10 micro seconds
+  digitalWrite(ultrasonicSensor.trigPin, HIGH);
+  delayMicroseconds(10);
+  digitalWrite(ultrasonicSensor.trigPin, LOW);
+
+  // Reads the echoPin, returns the sound wave travel time in microseconds
+  long duration = pulseIn(ultrasonicSensor.echoPin, HIGH);
+
+  // Calculating the distance
+  int distance= duration*0.034/2;
+
+  // Prints the distance on the Serial Monitor
+  Serial.print("Distance: ");
+  Serial.println(distance);
+
+  return distance;
+}
+
+
+void playBuzzerSound(int direction, int distance) {
+  int delayTime = distance * 3;
+  if(direction == LEFT) {
+    tone(buzzer, 1000, 200);
+    delay(delayTime);
+    noTone(buzzer);
+    delay(delayTime);
+  }
+  else {
+    tone(buzzer, 1100, 100);
+    delay(delayTime);
+    noTone(buzzer);
+    delay(delayTime);
+  }
+}