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Practical & Theory (M.C.Q)
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Q(3)
Write down an Arduino program to interface a temperature
monitoring system in a public environment which will display
information on 16*2 LCD “Fever” if temp is greater than 99.6
degrees and “No fever” if the temp.is below 99.6 degrees. (Use
of DHT11, Ultrasonic motion sensor is permissible).
Solution
#include <LiquidCrystal_I2C.h>
#include <DHT.h>
#define I2C_ADDR 0x27
#define LCD_COLUMNS 16
#define LCD_ROWS 2
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS,
LCD_ROWS);
#define DHTPIN 2
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
#define TRIG_PIN 3
#define ECHO_PIN 4
void setup() {
lcd.begin(LCD_COLUMNS, LCD_ROWS);
lcd.backlight();
dht.begin();
pinMode(TRIG_PIN, OUTPUT);
pinMode(ECHO_PIN, INPUT);
Serial.begin(9600);
void loop() {
digitalWrite(TRIG_PIN, LOW);
delayMicroseconds(2);
digitalWrite(TRIG_PIN, HIGH);
delayMicroseconds(10);
digitalWrite(TRIG_PIN, LOW);
long duration = pulseIn(ECHO_PIN, HIGH);
float distance = duration * 0.034 / 2;
float tempC = dht.readTemperature();
float tempF = dht.readTemperature(true);
if (isnan(tempC) || isnan(tempF)) {
lcd.setCursor(0, 0);
lcd.print("Sensor error");
return;
}
String status = (tempF > 99.6) ? "Fever" : "No fever";
lcd.setCursor(0, 0);
lcd.print("Temp: ");
lcd.print(tempF);
lcd.print(" F");
lcd.setCursor(0, 1);
lcd.print("Status: ");
lcd.print(status);
Serial.print("Distance: ");
Serial.print(distance);
Serial.print(" cm, Temp: ");
Serial.print(tempF);
Serial.print(" F, Status: ");
Serial.println(status);
delay(1000);
}
Q(2)
Write a program to measure the Air quality Index of a given
area using MQ135 gas sensor and to display the information
on LCD according to the following conditions:
Solution
#include <LiquidCrystal_I2C.h>
#define I2C_ADDR 0x27
#define LCD_COLUMNS 16
#define LCD_ROWS 2
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS,
LCD_ROWS);
#define MQ135_PIN A0
int calculateAQI(float ppm) {
if (ppm <= 50) return 50;
if (ppm <= 100) return 100;
if (ppm <= 150) return 150;
if (ppm <= 200) return 200;
if (ppm <= 300) return 300;
if (ppm <= 400) return 400;
return 500;
}
void setup() {
lcd.begin(LCD_COLUMNS, LCD_ROWS);
lcd.backlight();
lcd.setCursor(0, 0);
lcd.print("Air Quality:");
Serial.begin(9600);
}
void loop() {
int analogValue = analogRead(MQ135_PIN);
float voltage = analogValue * (5.0 / 1023.0);
float ppm = (voltage - 0.1) * 1000;
int aqi = calculateAQI(ppm);
lcd.setCursor(0, 1);
lcd.print("AQI: ");
lcd.print(aqi);
lcd.print(" ");
Serial.print("Analog Value: ");
Serial.print(analogValue);
Serial.print(" Voltage: ");
Serial.print(voltage);
Serial.print(" PPM: ");
Serial.print(ppm);
Serial.print(" AQI: ");
Serial.println(aqi);
delay(1000);
}
Q(1) M4R5
Arduino code to blink an LED
Solution
void setup() {
pinMode(13, OUTPUT);
}
void loop() {
digitalWrite(13, HIGH);
delay(1000);
digitalWrite(13, LOW);
delay(1000);
}
