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--- pm:prj2023:apredescu:cyclocomputer [2023/05/18 22:40]
andrei.cioltan [Hardware Design]
+++ pm:prj2023:apredescu:cyclocomputer [2023/05/29 22:22] (current)
andrei.cioltan [Software Design]
@@ Line 36: / Line 36: @@
 {{ :pm:prj2023:apredescu:cioltan_andrei_hardware1.jpeg?800 |}}
+{{ :pm:prj2023:apredescu:cioltan_andrei_h2.jpeg?800 |}}
+{{ :pm:prj2023:apredescu:cioltan_andrei_h1.jpeg?800 |}}
 ===== Software Design =====
+<code>
+#include <LiquidCrystal_I2C.h> // Library for LCD
+#define LED 7
+#define B1 9
+#define B2 8
+#define reed 6
-<note tip>
+LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows
-Descrierea codului aplicaţiei (firmware):
+float radius = 13;// tire radius (in inches)
-  * mediu de dezvoltare (if any) (e.g. AVR Studio, CodeVisionAVR)
+int reedVal;
-  * librării şi surse 3rd-party (e.g. Procyon AVRlib)
+long timer = 0;// time between one full rotation (in ms)
-  * algoritmi şi structuri pe care plănuiţi să le implementaţi
+float kph = 00.00;
-  * (etapa 3) surse şi funcţii implementate
+float circumference;
-</note>
+int tire = 0;
+float lastSize = radius;
+int maxReedCounter = 100;//min time (in ms) of one rotation (for debouncing)
+int reedCounter;
+int mode = 1; // (1) --> normal mode; (-1) --> sprint mode
+int lastMode = 1;
+int number_of_modes = 2;
+int number_of_wheel_sizes = 3;
+int modeState;
+int wheelState;
+int old_button1_state = HIGH;
+int old_button2_state = HIGH;
+int totalReadings = 0;
+int MAXREADINGS = 100;
+float averageSpeed = 0;
+float lastAverageSpeed = 0;
+float totalDistanceTraveled = 0;
+float tireSizes[3] = {13, 13.75, 14.5};
+void setup(){
+  lcd.init(); //initialize the lcd
+  lcd.backlight(); //open the backlight
+  lcd.begin(16, 2);
+  pinMode(B1, INPUT_PULLUP);
+  pinMode(B2, INPUT_PULLUP);
+  pinMode(LED, OUTPUT);
+  pinMode(reed, INPUT);
+  reedCounter = maxReedCounter;
+  circumference = 2 * 3.14 * radius;
+  cli();//stop interrupts
+  //set timer1 interrupt at 1kHz
+  TCCR1A = 0;// set entire TCCR1A register to 0
+  TCCR1B = 0;// same for TCCR1B
+  TCNT1  = 0;
+  // set timer count for 1khz increments
+  OCR1A = 1999;// = (1/1000) / ((1/(16*10^6))*8) - 1
+  // turn on CTC mode
+  TCCR1B |= (1 << WGM12);
+  // Set CS11 bit for 8 prescaler
+  TCCR1B |= (1 << CS11);
+  // enable timer compare interrupt
+  TIMSK1 |= (1 << OCIE1A);
+  sei();//allow interrupts
+  //END TIMER SETUP
+  Serial.begin(9600);
+}
+ISR(TIMER1_COMPA_vect) {//Interrupt at freq of 1kHz
+  reedVal = digitalRead(reed);
+  int button1 = digitalRead(B1);
+  int button2 = digitalRead(B2);
+  if ((button1 == LOW) && (old_button1_state == HIGH) && (wheelState < number_of_wheel_sizes))
+  {
+    wheelState = wheelState + 1;
+    digitalWrite(LED, HIGH);
+    lastSize = tireSizes[tire];
+    tire++;
+    tire %= 3;
+    radius = tireSizes[tire];
+    circumference = 2 * 3.14 * radius;
+  }
+  else if ((button1 == LOW) && (old_button1_state == HIGH) && (wheelState > (number_of_wheel_sizes - 1)))
+  {
+    wheelState = 1;
+    digitalWrite(LED, HIGH);
+    lastSize = tireSizes[tire];
+    tire++;
+    tire %= 3;
+    radius = tireSizes[tire];
+    circumference = 2 * 3.14 * radius;
+  }
+  else {
+    digitalWrite(LED, LOW);
+  }
+  old_button1_state = button1;
+  if ((button2 == LOW) && (old_button2_state == HIGH) && (modeState < number_of_modes))
+  {
+    modeState = modeState + 1;
+    lastMode = mode;
+    mode *= -1;
+  }
+  else if ((button2 == LOW) && (old_button2_state == HIGH) && (modeState > (number_of_modes - 1)))
+  {
+    modeState = 1;
+    lastMode = mode;
+    mode *= -1;
+  }
+  old_button2_state = button2;
+  if(mode == -1 && kph <= 20) {
+    digitalWrite(LED, HIGH);
+  }
+  else {
+    digitalWrite(LED, LOW);
+  }
+  if (reedVal != 1){
+    if (reedCounter == 0){//min time between pulses has passed
+      //kph = (56.8 * float(circumference))/float(timer);//calculate miles per hour
+      //kph *= 1.60934;// calculate km per hour
+      kph = (3600 * (float(circumference) * 0.0254)) / float(timer);
+      totalDistanceTraveled += (circumference / 39370.07);
+      totalReadings++;
+      averageSpeed = (averageSpeed + kph) / 2;
+      if(totalReadings == MAXREADINGS) {
+        totalReadings = 1;
+        averageSpeed = kph;
+      }
+      timer = 0;//reset timer
+      reedCounter = maxReedCounter;
+    }
+    else{
+      if (reedCounter > 0){
+        reedCounter -= 1;
+      }
+    }
+  }
+  else{
+    if (reedCounter > 0){
+      reedCounter -= 1;
+    }
+  }
+  if (timer > 2000){
+    kph = 0;//if no new pulses from senzor - tire is still, set kph to 0
+  }
+  else{
+    timer += 1;//increment timer
+  }
+}
+void displayKPH(){
+  if(radius != lastSize) {
+    lcd.clear();
+    lcd.setCursor(0, 0);
+    lcd.print("Wheel Size ");
+    lcd.print(radius * 2);
+    delay(700);
+    lcd.clear();
+    lastSize = radius;
+    averageSpeed = 0;
+  }
+  if(mode != lastMode) {
+    lcd.clear();
+    lcd.setCursor(0, 0);
+    if(mode == 1)
+      lcd.print("Normal");
+    else
+      lcd.print("Sprint");
+    lcd.print(" Mode");
+    delay(700);
+    lcd.clear();
+    lastMode = mode;
+  }
+  lcd.setCursor(0, 0); // move cursor to   (0, 0)
+  lcd.print(kph);
+  if(kph < 10) {
+    lcd.setCursor(4, 0);
+    lcd.print(" ");
+  }
+  lcd.setCursor(6,0);
+  lcd.print("km/h");
+  lcd.setCursor(0, 1);
+  lcd.print(averageSpeed);
+  lcd.setCursor(6, 1);
+  lcd.print("km/h");
+  lcd.setCursor(12,0);
+  lcd.print(totalDistanceTraveled);
+  lcd.setCursor(14, 1);
+  lcd.print("km");
+  Serial.println(kph);
+}
+void loop(){
+  displayKPH();
+  delay(500);
+}
+</code>
 ===== Rezultate Obţinute =====
@@ Line 73: / Line 276: @@
 <note>
-Listă cu documente, datasheet-uri, resurse Internet folosite, eventual grupate pe **Resurse Software** şi **Resurse Hardware**.
+Listă cu documente, datasheet-uri, resurse Internet folosite:
+[[https://en.wikipedia.org/wiki/Cyclocomputer]]
+[[https://arduinogetstarted.com/tutorials/arduino-lcd-i2c]]
+[[https://sensorkit.joy-it.net/en/sensors/ky-024]]
 </note>
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