Smart Fan using the Plug and Make Kit!

1/*  Author: PLACITECH
2 *   
3 *  YouTube: PLACITECH
4 *  Instagram: @placitech_
5 *  Tiktok: @placitech
6 *   
7 *  Use this code to create a Smart Fan that turns on
8 *  whenever the temperature of your room gets too hot.
9 *  This project was built using the Arduino Plug and Make Kit
10 *  and the Modulinos that come with it!
11 *  
12 *  Have fun! :)
13*/
14
15//// LIBRARIES. Make sure to have them installed!
16#include "Modulino.h"
17#include "ArduinoGraphics.h"
18#include "Arduino_LED_Matrix.h"
19
20
21//// INSTANCES (Components we will control)
22
23// Modulinos
24ModulinoThermo thermo;
25ModulinoBuzzer buzzer;
26ModulinoPixels leds;
27
28// Arduino UNO built-in LED Matrix
29ArduinoLEDMatrix matrix;
30
31
32//// PINS
33
34// For this project, we'll only use one pin to control the relay that turns on/off the fan
35#define relay 7
36
37
38//// VARIABLES
39
40int temperature; // Stores the current temperature (in degrees Celsius)
41
42// The temperature threshold that triggers the fan (in degrees Celsius)
43// Feel free to change this to what you find too hot!
44int start_temp = 27; 
45
46int freq = 1000; // Frequency of the buzzer sound (in Hertz)
47int dur = 250; // Duration of the beep (in milliseconds)
48
49
50//// FUNCTIONS
51
52// Turn the LEDs red (used for alerting high temperature)
53void leds_red(){
54  for (int i = 0; i < 8; i++) {
55    leds.set(i, RED, 25);
56    leds.show();
57  }
58}
59
60// Turn the LEDs green (used for signaling normal temperature)
61void leds_green(){
62  for (int i = 0; i < 8; i++) {
63    leds.set(i, GREEN, 25);
64    leds.show();
65  }
66}
67
68// Get the room's temperature and show it on the Arduino UNO built-in LED Matrix
69void get_temp(){
70  temperature = thermo.getTemperature(); // Read the temperature from the sensor
71  Serial.println("Temp = " + String(temperature) + "°C"); // Print it to the Serial Monitor
72
73  // Display temperature starting from the 1st column and 1st row of the LED Matrix
74  matrix.beginText(1, 1, 0xFFFFFF); 
75  matrix.println(temperature);
76  matrix.endText();
77}
78
79
80
81void setup(){
82  // Start serial monitor
83  Serial.begin(9600);
84
85  // Set the relay pin as an output (to control the fan)
86  pinMode(relay, OUTPUT);
87  digitalWrite(relay, LOW);  // Ensure the fan starts off
88
89  // Initialize all connected Modulinos and the built-in matrix
90  Modulino.begin();
91  thermo.begin();
92  buzzer.begin();
93  leds.begin();
94  matrix.begin();
95
96  // Set the font size for text displayed on the matrix
97  matrix.textFont(Font_5x7);
98
99  delay(100); // Small startup delay
100}
101
102
103
104void loop(){
105  // Read temperature every 5 seconds until it reaches the threshold
106  while (temperature < start_temp){
107    delay(5000);
108    get_temp();
109  }
110  
111  // Alert the user that the threshold was reached using the Serial Monitor
112  Serial.println();
113  Serial.println("High temperature detected!");
114  Serial.println("Turning on fan!");
115  Serial.println();
116
117  // Alert the user that threshold was reached using the Pixels (LEDs) and Buzzer Modulinos
118  for (int i = 0; i < 3; i++){
119    buzzer.tone(freq, dur); // Make a beep
120    leds_red(); // Turn LEDs red
121    delay(250);
122    buzzer.tone(0, dur); // Stop the sound
123    leds.clear(); // Turn off LEDs
124    leds.show();
125    delay(250);
126  }
127
128  // Turn on fan
129  digitalWrite(relay, HIGH);
130
131  // Continue monitoring temperature every 5 seconds
132  // The fan will stay on until the temperature is 1 degree below the threshold
133  // This avoids turning the fan on/off frequently due to minor fluctuations
134  while (temperature >= start_temp - 1){
135    delay(5000);
136    get_temp();
137  }
138
139
140  // Alert the user that the temperature is OK using the Serial Monitor
141  Serial.println();
142  Serial.println("Temperature OK.");
143  Serial.println("Turning off fan.");
144  Serial.println();
145
146
147  // Alert the user that the temperature is OK using the Pixels (LEDs) and Buzzer Modulinos
148  for (int i = 0; i < 3; i++){
149    buzzer.tone(freq, dur);
150    leds_green();
151    delay(250);
152    buzzer.tone(0, dur);
153    leds.clear();
154    leds.show();
155    delay(250);
156  }
157
158  // Turn off fan
159  digitalWrite(relay, LOW);
160}