Bike_Computer-prod.ino

This is the file that you would want to run in your "production environment" IE, after testing and the device has been mounted to your bike

Bike_Computer

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+/* Bike Computer V1
+
+  Provides controls to basic functions on a bike, such as turning on and off lights,
+  Measuring distance traveled, average speed, and logs to a microSD card.
+  
+  Future versions will also be able to communicate to other 
+  microcontrollers through the serial interface.
+  
+  Version 1 (This version) will be responsible for detecting ambiant light and ramping
+  up/down the front and rear LED brightness once light levels reach a certain level.
+  Other responsibilities will be blinking pairs of LEDs (front and back) on either side 
+  of the bike to indicate turning.
+  
+*/
+
+// D4 and D5 are reserved for I2C
+
+// Headlight
+const int ambientIn = A0; // Analog input pin that the potentiometer is attached to
+const int headlight = 3; // Analog output pin that the LED is attached to
+const int incrBy = 5; // Amount to increase or decrease LED brightness by
+int sensorValue = 0; // value read from the pot
+int outputValue = 0; // value output to the PWM (analog out)
+
+// Blinkers
+const int lBnkSw = A1; // Left Blinker switch
+const int rBnkSw = A2; // Right Blinker switch
+const int lBnk = 6; // Left Blinker
+const int rBnk = 7; // Right Blinker
+const int bnkSpeed = 500; // in ms, 500 = twice a second
+int lBnkSt = LOW;
+int rBnkSt = LOW;
+int lBnkSwSt = 0;
+int rBnkSwSt = 0;
+unsigned long previousMillis = 0;
+
+
+void setup() {  
+  // Set out outputs
+  pinMode(headlight, OUTPUT);
+  pinMode(lBnk, OUTPUT);
+  pinMode(rBnk, OUTPUT);
+  
+  // Set our inputs
+  pinMode(ambientIn, INPUT);
+  pinMode(lBnkSw, INPUT);
+  pinMode(rBnkSw, INPUT);
+}
+
+void headLight(){ // Main function for determining whether or not to ramp up or ramp down the headlight and taillight. Uses ambient light sensor for that
+  sensorValue = analogRead(ambientIn);
+  
+  if(sensorValue <= 45 && outputValue <= 250){
+    outputValue = outputValue + incrBy;
+  }
+
+  if(sensorValue >= 50 && outputValue > 0){
+    outputValue = outputValue - incrBy;
+  }
+  analogWrite(headlight, outputValue);
+}
+
+void blinker(){ // Controls the blinkers
+  unsigned long currentMillis = millis();
+  
+  // Get info from switches
+  lBnkSwSt = digitalRead(lBnkSw);
+  rBnkSwSt = digitalRead(rBnkSw);
+  
+  // Automatically turn off LEDs if switch is off
+  if(lBnkSwSt == LOW){ digitalWrite(lBnk, LOW); }
+  if(rBnkSwSt == LOW){ digitalWrite(rBnk, LOW); }
+  
+  if(lBnkSwSt == HIGH){ // Test if left blinker switch is on
+     if(currentMillis - previousMillis >= bnkSpeed){
+      previousMillis = currentMillis;   
+      
+      if(lBnkSt == LOW) 
+        lBnkSt = HIGH;
+      else
+        lBnkSt = LOW;
+      
+      digitalWrite(lBnk, lBnkSt); // Begin blinking
+    }
+  }
+  
+  if(rBnkSwSt == HIGH){ // Test if right blinker is on
+    if(currentMillis - previousMillis >= bnkSpeed){
+      previousMillis = currentMillis;   
+      
+      if(rBnkSt == LOW)
+        rBnkSt = HIGH;
+      else
+        rBnkSt = LOW;
+      
+      digitalWrite(rBnk, rBnkSt); // Begin blinking
+    }
+  }
+}
+
+
+void loop() { 
+  headLight();
+  blinker();
+}