Add LCD panel to show stats

Bike_Computer.ino

@@ -1,23 +1,31 @@
-/* Bike Computer V1
+/* Bike Computer V1.1
+
+  Using the serial functions signifigantly increases compiled size, use this if you have a problem in execution or are testing.
+  Use the version without diagnostics in production (once you work out the bugs of course)
 
   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 
+
+  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 
+  Other responsibilities will be blinking pairs of LEDs (front and back) on either side
   of the bike to indicate turning.
-  
+
 */
 
+#include <SoftwareSerial.h>
+
+SoftwareSerial lcd(2, 8);  // This is required, to start an instance of an LCD
+const int dispSw = A3;
+
 // 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 headlight = 3; // Digital 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)
@@ -34,22 +42,31 @@ int lBnkSwSt = 0;
 int rBnkSwSt = 0;
 unsigned long previousMillis = 0;
 
+void setup() {
+  lcd.begin(9600);  // Start the LCD at 9600 baud
+  clearDisplay();  // Clear the display
+  setBacklight(20);
 
-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);
+  pinMode(dispSw, INPUT);
+
+  setLCDCursor(0);
+  lcd.print("c0defox.es BCPU");
+  setLCDCursor(18);
+  lcd.print("Bike Computer");
 }
 
 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;
   }
@@ -58,48 +75,92 @@ void headLight(){ // Main function for determining whether or not to ramp up or
     outputValue = outputValue - incrBy;
   }
   analogWrite(headlight, outputValue);
+  if(outputValue >= 20){ // Ramp up/down lcd brightness with headlight - anything lower than 20 is too hard to read
+    setBacklight(outputValue);
+
+    setLCDCursor(16);
+    lcd.print("*"); // Headlight indicator on lcd
+    lcd.print(outputValue); // Brightness level of headlight
+  }
 }
 
 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) 
+      previousMillis = currentMillis;
+
+      if(lBnkSt == LOW){
         lBnkSt = HIGH;
-      else
+
+        setLCDCursor(0);
+        lcd.print("<");
+      }else{
         lBnkSt = LOW;
-      
+
+        setLCDCursor(0);
+        lcd.print(" ");
+      }
+
       digitalWrite(lBnk, lBnkSt); // Begin blinking
     }
   }
-  
+
   if(rBnkSwSt == HIGH){ // Test if right blinker is on
+    echo("rBlinkSw", "ON");
     if(currentMillis - previousMillis >= bnkSpeed){
-      previousMillis = currentMillis;   
-      
-      if(rBnkSt == LOW)
+      previousMillis = currentMillis;
+
+      if(rBnkSt == LOW){
         rBnkSt = HIGH;
-      else
+
+        setLCDCursor(15);
+        lcd.print(">");
+      }else{
         rBnkSt = LOW;
-      
+
+        setLCDCursor(15);
+        lcd.print(" ");
+      }
+
       digitalWrite(rBnk, rBnkSt); // Begin blinking
     }
   }
 }
 
+void setBacklight(byte brightness){
+  lcd.write(0x80);  // send the backlight command
+  lcd.write(brightness);  // send the brightness value
+}
+
+void clearDisplay(){
+  lcd.write(0xFE);  // send the special command
+  lcd.write(0x01);  // send the clear screen command
+}
+
+void setLCDCursor(byte cursor_position){
+  lcd.write(0xFE);  // send the special command
+  lcd.write(0x80);  // send the set cursor command
+  lcd.write(cursor_position);  // send the cursor position
+}
+
+void loop(){
+
+  delay(500);
+  clearDisplay();
+
+  setLCDCursor(4);
+  lcd.print("MPH: 7.5");
 
-void loop() { 
   headLight();
   blinker();
 }