engg

/**   @author: s44310776, s44592947   @version: 10_19   Hardware Connections:   - Triple Axis Accellerometer   - 6 LEDs   - 1 Button Switch*/#include <SparkFun_ADXL345.h> //Acclerometer Library/** Accelerometer configuration. */ADXL345 adxl = ADXL345(); //Use I2C/** LED array. Indexed from left to right when looking at FDR    with the LEDs on the bottom. */int leds[] = {2, 3, 4, 5, 6, 7};/// Counts the number of seconds elapsed since launch in decimal format.int d_seconds = 0;/// Counts the number of seconds elapsed since launch in binary format.char b_seconds[5] = {0, 0, 0, 0, 0};unsigned long last_time; // Used to count elapsed time.bool launched = false; // True when the glider is launched.bool landed = false; // True after the plane lands.float launch_threshold = 2.5; // Threshold to exceed when launching (g-forces)float land_threshold = 3.5; // Threshold to exceed when landing (g-forces)int push_button = 10;  // Button pin 10.unsigned long duration;  // Duration of button push.void(* resetFunc)(void) = 0; //declare reset function at address 0void setup() {  Serial.begin(9600);  //Accelerometer Initialisation  adxl.powerOn();  adxl.setRangeSetting(8); // Range in g (lower for more accuracy)  //Initialise Pins  for (int i; i < sizeof(leds)/sizeof(int); i++) {    pinMode(leds[i], OUTPUT);  }  pinMode(push_button, INPUT);  //Set last_time on startup.  last_time = millis();}void loop() {    //Take Accelerometer Reading  int x,y,z;  adxl.readAccel(&x,&y,&z);  //Convert to g-force  float g = sqrt(pow(x, 2) + pow(y, 2) + pow(z,2))/31;    Serial.print(g);  /*   * Set launched to true when g-force is above the threshold.  * Set landed when g-force is above the threshold and plane is in the air.  */  if (g > launch_threshold && launched == false && landed == false) {    launched = true;    delay(1000);  } else if ((g > land_threshold && launched == true && landed == false) || (d_seconds >= 31)) {    launched = false;    landed = true;  }  // While the plane is launched count seconds and write the LEDs every second.  Serial.println(d_seconds);  if (launched && millis() - last_time > 1000 && d_seconds < 31) {    d_seconds++;    decimalToBinary(d_seconds, b_seconds);    writeLeds(b_seconds);    last_time = millis();  }  // Time the button push.  while (digitalRead(push_button) == LOW) {    // Count duration using delay up to 3 seconds.    if (duration < 30) {      duration++;      Serial.println(duration);      delay(100);    } else {    // If pressed for more than 3 seconds, reset.      writeLeds("101010");      delay(2000);      writeLeds("000000");      resetFunc();    }  }  //Write all LEDs on if the duration of the button push is less than 3 seconds.  if (duration < 30 && duration > 0) {    duration = 0;    writeLeds("111111");  } else {    duration = 0;  } }/* @function decimalToBinary * -------------------------- * @description - converts a decimal integer to a binary integer. * @param {int} dec - the decimal integer to convert. * @param {char} output[] - the array to output the integer in binary format. */void decimalToBinary(int dec, char output[]) {    int index = 0;    while (dec != 0) {    /* Finds decimal%2 and adds to the binary value */    output[index] = (dec % 2) + '0';    dec /= 2;      index++;    }    while(index < 5) {    output[index] = '0';    index++;  }  output[index] = '\0';  }/* @function writeLeds * ------------------- * @description - write to LED pins to display the elapsed time. * @param {char} input[] - the array containing the binary number to express. */void writeLeds(char input[]) {  for (int i = 0; i < 6; i++) {    digitalWrite(leds[i], input[i] == '0' ? LOW : HIGH);  }}