Add Arduino firmware

humdifier_controller/humdifier_controller.ino

@@ -0,0 +1,60 @@
+/*
+modified on Apr 10, 2021
+Modified by MehranMaleki from Arduino Examples
+Home
+*/
+
+#include <Wire.h>
+#include "DFRobot_SHT20.h"
+
+DFRobot_SHT20 sht20;
+
+void fanOn() {
+  digitalWrite(7, HIGH);
+}
+
+void fanOff() {
+  digitalWrite(7, LOW);
+}
+
+
+void setup()
+{
+    pinMode(4, OUTPUT);
+    pinMode(7, OUTPUT);
+    digitalWrite(7, LOW);
+    
+    Serial.begin(115200);
+    //Serial.println("SHT20 Example!");
+    //Serial.println("temperature,humidity");
+    sht20.initSHT20();                         // Init SHT20 Sensor
+    delay(100);
+    //sht20.checkSHT20();                        // Check SHT20 Sensor
+}
+
+void toggle() {
+  digitalWrite(4, HIGH);
+  delay(100);
+  digitalWrite(4, LOW);
+}
+
+void loop()
+{
+  while (Serial.available()) {
+    const int c = Serial.read();
+    if (c == 's') {
+      // TODO dump the current status  
+      float humd = sht20.readHumidity();         // Read Humidity
+      float temp = sht20.readTemperature();      // Read Temperature
+      float volts = (5.0f/1024.0f)*analogRead(A2);
+      Serial.print(humd);
+      Serial.print(",");
+      Serial.print(temp);
+      Serial.print(",");
+      Serial.println(volts);
+    } else if (c == 'h') {
+      toggle();
+    }
+  }
+  delay(50);
+}