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Firmware/SafetyHat.ino

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+// Code for the Eye Protection Hat by Görkem Bozkurt (https://gorkem.cc)
+// Based on the example sound level sketch from Adafruit(https://learn.adafruit.com/adafruit-microphone-amplifier-breakout/measuring-sound-levels)
+// details here:
+
+#include <Servo.h>
+
+float sensitivity = 3; // a value between 0 and 3.30
+
+Servo meservo;
+const int sampleWindow = 50; // Sample window width in mS (50 mS = 20Hz)
+unsigned int sample;
+int led = 10;
+bool isUp = true;
+int c = 0;
+
+void setup() 
+{
+   meservo.attach(2);
+   pinMode(led,OUTPUT);
+   Serial.begin(9600);
+   meservo.write(40);
+   delay(1000);
+   meservo.detach();
+}
+ 
+ 
+void loop() 
+
+{
+   unsigned long startMillis= millis();  // Start of sample window
+   unsigned int peakToPeak = 0;   // peak-to-peak level
+ 
+   unsigned int signalMax = 0;
+   unsigned int signalMin = 1024;
+ 
+   // collect data for 50 mS
+   while (millis() - startMillis < sampleWindow)
+   {
+      sample = analogRead(1);
+      if (sample < 1024)  // toss out spurious readings
+      {
+         if (sample > signalMax)
+         {
+            signalMax = sample;  // save just the max levels
+         }
+         else if (sample < signalMin)
+         {
+            signalMin = sample;  // save just the min levels
+         }
+      }
+   }
+   peakToPeak = signalMax - signalMin;  // max - min = peak-peak amplitude
+   double volts = (peakToPeak * 5.0) / 1024;  // convert to volts
+
+  if(volts>sensitivity){
+    if(c>10){
+      motorDown();
+      }else{  
+      motorUp();
+        }
+    c+=1;
+    
+    }else{
+    c=0;
+    motorUp();
+      }
+}
+
+void motorUp(){
+    Serial.println("Safe");
+    digitalWrite(led,LOW);
+    if(!isUp){
+    meservo.attach(2);
+    meservo.write(40);
+    isUp=true;
+    delay(500);
+    meservo.detach();
+    }
+
+  }
+
+void motorDown(){
+    Serial.println("Drill in use");
+    digitalWrite(led,HIGH);  
+  if(isUp){
+    meservo.attach(2);
+    meservo.write(170);
+    isUp=false;
+    delay(500);
+    meservo.detach();
+    }
+
+  }