Using the above figure, create one Arduino sketche for each of the below require

ID: 2081849 • Letter: U

Question

Using the above figure, create one Arduino sketche for each of the below requirements: 1. Write code to create continuously chasing LEDs similar to a theater or carnival marquee. LED 1 turns on, then LED 2, then LED 3, ellipsis, all the way through to LED 10, and back to LED 1. Only one LED is on at a time. 2. Write code to create a bargraph voltmeter using the potentiometer as the input voltage. As the voltage increases from 0 to 5V, the LEDs illuminate progressively from LED1 to LED 10. For example, for an input of 2.5V there will be five LEDs illuminated.

Explanation / Answer

Answer 1

void setup() {
// initialize the digital pin as an output.
// Pin 13 has an LED connected on most Arduino boards:
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(7, OUTPUT);
pinMode(8, OUTPUT);
pinMode(9, OUTPUT);
pinMode(10, OUTPUT);
pinMode(11, OUTPUT);
}

void loop() {
digitalWrite(2, HIGH);
delay(500);
digitalWrite(2, LOW);
digitalWrite(3, HIGH);
delay(500);
digitalWrite(3, LOW);
digitalWrite(4, HIGH);
delay(500);
digitalWrite(4, LOW);
digitalWrite(5, HIGH);
delay(500);
digitalWrite(5, LOW);
digitalWrite(6, HIGH);
delay(500);
digitalWrite(6, LOW);
digitalWrite(7, HIGH);
delay(500);
digitalWrite(7, LOW);
digitalWrite(8, HIGH);
delay(500);
digitalWrite(8, LOW);
digitalWrite(9, HIGH);
delay(500);
digitalWrite(9, LOW);
digitalWrite(10, HIGH);
delay(500);
digitalWrite(10, LOW);
digitalWrite(11, HIGH);
delay(500);
digitalWrite(11, LOW);
}

Answer 2:

const int analogPin = A0;   // the pin that the potentiometer is attached to
const int ledCount = 10;   // the number of LEDs in the bar graph

int ledPins[] = {
  2, 3, 4, 5, 6, 7, 8, 9, 10, 11
};   // an array of pin numbers to which LEDs are attached

void setup() {
  // loop over the pin array and set them all to output:
  for (int thisLed = 0; thisLed < ledCount; thisLed++) {
  pinMode(ledPins[thisLed], OUTPUT);
  }
}

void loop() {
  // read the potentiometer:
  int sensorReading = analogRead(analogPin);
  // map the result to a range from 0 to the number of LEDs:
  int ledLevel = map(sensorReading, 0, 1023, 0, ledCount);

  // loop over the LED array:
  for (int thisLed = 0; thisLed < ledCount; thisLed++) {
  // if the array element's index is less than ledLevel,
  // turn the pin for this element on:
  if (thisLed < ledLevel) {
  digitalWrite(ledPins[thisLed], HIGH);
  }
  // turn off all pins higher than the ledLevel:
  else {
  digitalWrite(ledPins[thisLed], LOW);
  }
  }
}

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Using the above figure, create one Arduino sketche for each of the below require

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