Initial commit

src/main.cpp

@@ -0,0 +1,88 @@
+#include <Arduino.h>
+#include <Encoder.h>
+#include <LiquidCrystal_I2C.h>
+
+#define encoder_pin_a 2
+#define encoder_pin_b 3
+#define a_sec 1000000
+
+// LCD Address is 0x27
+LiquidCrystal_I2C lcd(0x27, 16, 2);
+
+Encoder encoder(encoder_pin_a, encoder_pin_b);
+unsigned long encoder_timer = 0;
+
+float encoder_new = 0;
+float encoder_old = 0;
+float frequency = 0;
+unsigned int on_time = 100;
+boolean is_on = false;
+unsigned long timer;
+
+void setup() {
+  // put your setup code here, to run once:
+  Serial.begin(9600);
+  pinMode(5, OUTPUT);
+  // Turn off pin 5
+  PORTD = PORTD & B11011111;
+  encoder_new = encoder.read();
+  encoder_old = encoder.read();
+  timer = micros();
+  encoder_timer = millis();
+
+  lcd.init();
+  lcd.clear();         
+  lcd.backlight();
+  lcd.setCursor(0,0);   //Set cursor to character 2 on line 0
+  lcd.print("Frequency:");
+  lcd.print(frequency);
+  
+  lcd.setCursor(0,1);   //Move cursor to character 2 on line 1
+  lcd.print("RPM:");
+  lcd.print(frequency*60);
+}
+
+void loop() {
+  // Get encoder data
+  float encoder_new = float(encoder.read())/8;
+  if (encoder_new != encoder_old && millis() - encoder_timer > 100) {
+    float difference = encoder_new - encoder_old;
+    
+    frequency = frequency + pow(difference, 3);
+    encoder_old = encoder_new;
+
+  if(frequency < 0 || frequency > 2000 || encoder_new < 0){
+    frequency = 0; 
+    encoder_new = 0; 
+    encoder_old = 0;
+  }
+    lcd.setCursor(0,0);   //Set cursor to character 2 on line 0
+    lcd.print("Frequency:");
+    lcd.print(frequency);
+  
+    lcd.setCursor(0,1);   //Move cursor to character 2 on line 1
+    lcd.print("RPM:");
+    lcd.print(frequency*60);
+
+    encoder_timer = millis();
+  }
+
+  if(frequency != 0){
+    if(is_on == true){
+      // Wait a set amount of time and then turn the LED off
+      if(micros()-timer >= on_time){
+        PORTD = PORTD & B11011111;
+      }
+      // wait the rest of the off period then reset the clock
+      if((micros()-timer) >= a_sec/frequency - on_time){
+        is_on = false;
+        timer = micros();
+      }
+    }
+    else{
+      // Turn on the LED
+      PORTD = PORTD | B00100000;
+      is_on = true;
+    }
+  }
+}