regression for alcohol percen

microcontroller/sketch_apr22a/sketch_apr22a.ino

@@ -1,9 +1,8 @@
 #include <LiquidCrystal_I2C.h>
-#include <MQUnifiedsensor.h>
 #include <DHT.h>
 
 #define BOARD "ESP-32"
-#define MQPIN 36
+#define MQPIN 34
 #define DHTPIN 4
 #define LAMPPIN 26
 #define FANPIN 25
@@ -11,6 +10,27 @@
 LiquidCrystal_I2C lcd(0x27, 16, 2);
 DHT dht(DHTPIN, 22);
 
+float getKadarGas() {
+  int total = 100;
+  int valueTotal = 0;
+
+  for (int i = 0; i < total; i++) {
+    int value = analogRead(MQPIN);
+    valueTotal = valueTotal + value;
+  }
+
+  float valueAvg = valueTotal / total;
+
+  return valueAvg;
+}
+
+float getPersentaseKadarGas(float voltase) {
+  float persentase = 0.2011 * pow(voltase, 2) + 0.0733 * voltase - 0.0363;
+  float hasil = constrain(persentase * 100, 0, 100);
+
+  return hasil;
+}
+
 void setup(){
   pinMode(MQPIN, INPUT);
   pinMode(LAMPPIN, OUTPUT);
@@ -25,31 +45,41 @@ void setup(){
   lcd.backlight();
 
   lcd.setCursor(0, 0);
-  lcd.print("Memuat....");
+  lcd.print("Memuat..........");
 
   dht.begin();
 
-  delay(5000);
+  delay(20000);
 }
 
 void loop(){
-  int kadarGas = analogRead(MQPIN);
+  float kadarGas = getKadarGas();
-  int kadarGasPersen = map(kadarGas, 250, 1023, 0, 100);
+  float kadarGasVoltase = kadarGas / 4095.0 * 3.3;
+  float persentaseKadarGas = getPersentaseKadarGas(kadarGasVoltase);
   
   lcd.clear();
   lcd.setCursor(0, 0);
-  lcd.print("Kadar Gas : ");
+  lcd.print("G : ");
+  lcd.print(kadarGas);
   lcd.setCursor(0,1);
-  lcd.print(String(kadarGas));
+  lcd.print("PG : ");
+  lcd.print(persentaseKadarGas, 1);
+  lcd.print(" %");
+
+  delay(1500);
 
   float suhu = dht.readTemperature();
+  float kelembaban = dht.readHumidity();
 
-  delay(2000);
   lcd.clear();
   lcd.setCursor(0, 0);
-  lcd.print("Suhu : ");
+  lcd.print("S : ");
+  lcd.print(suhu, 1);
+  lcd.print(" C");
   lcd.setCursor(0, 1);
-  lcd.print(String(suhu) + " C");
+  lcd.print("K : ");
+  lcd.print(kelembaban, 1);
+  lcd.print(" %");
 
   if (suhu <= 30) {
     digitalWrite(LAMPPIN, LOW);
@@ -63,20 +93,11 @@ void loop(){
     digitalWrite(FANPIN, HIGH);
   }
 
-  float kelembaban = dht.readHumidity();
+  Serial.println("Voltase Kadar Gas : " + String(kadarGasVoltase));
-
+  Serial.println("Persentase Kadar Gas : " + String(persentaseKadarGas) + " %");
-  delay(2000);
-  lcd.clear();
-  lcd.setCursor(0, 0);
-  lcd.print("Kelembaban : ");
-  lcd.setCursor(0, 1);
-  lcd.print(String(kelembaban) + " %");
-
-  Serial.println("Kadar Gas : " + String(kadarGas));
-  Serial.println("Persen Kadar Gas : " + String(kadarGasPersen) + " %");
   Serial.println("Suhu : " + String(suhu) + " C");
   Serial.println("Kelembaban : " + String(kelembaban) + " %");
 
-  delay(2000);
+  delay(1500);
   lcd.clear();
 }