Electronics Class – Day 8

This is a support page for day 8 of an 8-session class is a basic introduction to both electronics and programming the Arduino microprocessor.  The intent is to prepare the student for what is currently popular in the maker world, rather than an electronics or engineering degree, and includes some things of interest to amateur radio enthusiasts.

Day 1, Day 2, Day 3, Day 4, Day 5, Day 6, Day 7, Day 8

Day 8: Build Arduino various projects using sensors
Goals:
    • Build Arduino various projects using sensors
Vocabulary:
    • Motion detector
    • Rotation sensor
    • Humidity Sensor
Ultrasonic Sensor – schematic diagram, wiring and code

Schematic:

Build:

Code:

Ultrasonic.ino

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/*
 * Created by ArduinoGetStarted, https://arduinogetstarted.com
 *
 * Arduino - Ultrasonic Sensor HC-SR04
 *
 * Wiring: Ultrasonic Sensor -> Arduino:
 * - VCC  -> 5VDC
 * - TRIG -> Pin 9
 * - ECHO -> Pin 8
 * - GND  -> GND
 *
 * Tutorial is available here: https://arduinogetstarted.com/tutorials/arduino-ultrasonic-sensor
 */

int trigPin = 9;    // TRIG pin
int echoPin = 8;    // ECHO pin

float duration_us, distance_cm;

void setup() {
  Serial.begin (9600);

  // configure the trigger pin to output mode
  pinMode(trigPin, OUTPUT);
  // configure the echo pin to input mode
  pinMode(echoPin, INPUT);
}

void loop() {
  // generate 10-microsecond pulse to TRIG pin
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // measure duration of pulse from ECHO pin
  duration_us = pulseIn(echoPin, HIGH);

  // calculate the distance
  distance_cm = 0.017 * duration_us;

  // print the value to Serial Monitor
  Serial.print("distance: ");
  Serial.print(distance_cm);
  Serial.println(" cm");

  delay(500);
}

 

Hall Effect Sensor – schematic diagram, wiring and code

Schematic:

Build:

Code:

HallSensor.ino

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const int hallPin = 2;
const int ledPin = 13;  // built-in

void setup() {
  pinMode(hallPin, INPUT);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  int val = digitalRead(hallPin);
  digitalWrite(ledPin, val ? LOW : HIGH);
  delay(10);
}

 

Temperature & Humidity  Sensor – schematic diagram, wiring and code

Schematic:

Build:

Code:

Humidity.ino

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/*
 * Created by ArduinoGetStarted.com
 *
 * This example code is in the public domain
 *
 * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-temperature-humidity-sensor
 */

#include "DHT.h"
#define DHTPIN 2
#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  dht.begin(); // initialize the sensor
}

void loop() {
  // wait a few seconds between measurements.
  delay(2000);

  // read humidity
  float humi  = dht.readHumidity();
  // read temperature as Celsius
  float tempC = dht.readTemperature();
  // read temperature as Fahrenheit
  float tempF = dht.readTemperature(true);

  // check if any reads failed
  if (isnan(humi) || isnan(tempC) || isnan(tempF)) {
    Serial.println("Failed to read from DHT sensor!");
  } else {
    Serial.print("Humidity: ");
    Serial.print(humi);
    Serial.print("%");

    Serial.print("  |  "); 

    Serial.print("Temperature: ");
    Serial.print(tempC);
    Serial.print("°C ~ ");
    Serial.print(tempF);
    Serial.println("°F");
  }
}

 

Homework:
    • Do something with what you’ve learned

 

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