Arduino พัดลมเปิดปิดอัตโนมัติควบคุมความเร็วตามอุณหภูมิ 4ระดับ
จะทำพัดลมอัตโนมัติควบคุมความเร็วตามอุณหภูมิ 4 ระดับ ถ้าอุณหภูมิสูงขึ้นพัดลมจะหมุนเร็วขึ้นตามไปด้วย มีจอแสดงผล ค่าอุณหภูมิห้อง ความชื้นในอากาศ และ ไฟสถานะแสดงระดับความเร็วของพัดลม ใช้ Arduino UNO R3 เป็นบอร์ดประมวลผล ในการอ่านค่าและสั่งงานอุปกรณ์ต่างๆ และใช้ เซ็นเซอร์วัดอุณหภูมิและความชื้น DHT22 วัดค่าอุณหภูมิห้อง
#include "DHT.h"
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#include <Wire.h>
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#include <LiquidCrystal_I2C.h>
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int Number = 0;
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const int in3Pin = 3;
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const int in4Pin = 4;
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int p8_Lv1 = 8;
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int p8_Lv2 = 9;
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int p8_Lv3 = 10;
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int p8_Lv4 = 11;
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LiquidCrystal_I2C lcd(0x27, 16, 2);
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#define DHTPIN 2 // what digital pin we're connected to
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#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
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DHT dht(DHTPIN, DHTTYPE);
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void setup() {
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Serial.begin(9600);
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Serial.println("DHTxx test!");
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dht.begin();
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lcd.begin();
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lcd.backlight();
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pinMode(in3Pin, OUTPUT);
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pinMode(in4Pin, OUTPUT);
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analogWrite (in3Pin , 0);
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digitalWrite(in4Pin, LOW);
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pinMode(p8_Lv1, OUTPUT);
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pinMode(p8_Lv2, OUTPUT);
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pinMode(p8_Lv3, OUTPUT);
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pinMode(p8_Lv4, OUTPUT);
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digitalWrite(p8_Lv1, LOW);
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digitalWrite(p8_Lv2, LOW);
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digitalWrite(p8_Lv3, LOW);
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digitalWrite(p8_Lv4, LOW);
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}
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void loop() {
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delay(2000);
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float h = dht.readHumidity();
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// Read temperature as Celsius (the default)
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float t = dht.readTemperature();
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// Read temperature as Fahrenheit (isFahrenheit = true)
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float f = dht.readTemperature(true);
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// Check if any reads failed and exit early (to try again).
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if (isnan(h) || isnan(t) || isnan(f)) {
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Serial.println("Failed to read from DHT sensor!");
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return;
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}
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// Compute heat index in Fahrenheit (the default)
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float hif = dht.computeHeatIndex(f, h);
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// Compute heat index in Celsius (isFahreheit = false)
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float hic = dht.computeHeatIndex(t, h, false);
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Serial.print("Humidity: ");
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Serial.print(h);
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Serial.print(" %\t");
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Serial.print("Temperature: ");
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Serial.print(t);
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Serial.print(" *C ");
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Serial.print(f);
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Serial.print(" *F\t");
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Serial.print("Heat index: ");
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Serial.print(hic);
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Serial.print(" *C ");
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Serial.print(hif);
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Serial.println(" *F");
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if ( t < 30 ) {
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Number = 0;
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analogWrite (in3Pin , 0);
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digitalWrite(p8_Lv1, LOW);
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digitalWrite(p8_Lv2, HIGH);
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digitalWrite(p8_Lv3, HIGH);
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digitalWrite(p8_Lv4, HIGH);
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}
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if ( t > 30 && t <= 35 ) {
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Number = 1;
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analogWrite (in3Pin , 100);
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digitalWrite(p8_Lv1, LOW);
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digitalWrite(p8_Lv2, LOW);
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digitalWrite(p8_Lv3, HIGH);
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digitalWrite(p8_Lv4, HIGH);
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}
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if ( t > 35 && t <= 40 ) {
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Number = 2;
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analogWrite (in3Pin , 150);
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digitalWrite(p8_Lv1, LOW);
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digitalWrite(p8_Lv2, LOW);
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digitalWrite(p8_Lv3, LOW);
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digitalWrite(p8_Lv4, HIGH);
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}
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if ( t > 40 ) {
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Number = 3;
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analogWrite (in3Pin , 255);
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digitalWrite(p8_Lv1, LOW);
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digitalWrite(p8_Lv2, LOW);
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digitalWrite(p8_Lv3, LOW);
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digitalWrite(p8_Lv4, LOW);
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}
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lcd.setCursor(0, 0);
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lcd.print("Tem:");
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lcd.print(t);
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lcd.print("*C");
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lcd.setCursor(0, 1);
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lcd.print("Hum:");
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lcd.print(h);
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lcd.print("% ");
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lcd.print("Num:");
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lcd.print(Number);
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}
แหล่งที่มา
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