Implement soil humidity logging to serial console

src/main.cpp

@@ -6,6 +6,9 @@
 
 DHT dht(DHTPIN, DHTTYPE);
 
+int fc28_pin = A0;
+int soil_threshold = 40;
+
 void setup() {
   Serial.begin(9600);
   dht.begin();
@@ -13,8 +16,10 @@ void setup() {
 
 void loop() {
   char buffer[100];
-  sprintf(buffer, "Temperature: %.2f °C Humidity: %.2f %%",
-          dht.readTemperature(), dht.readHumidity());
+  int analog_val = analogRead(fc28_pin);
+  int soil_percentage = map(analog_val, 0, 1023, 0, 100);
+  sprintf(buffer, "Temperature: %.2f °C Humidity: %.2f %% Soil humidity: %i %%",
+          dht.readTemperature(), dht.readHumidity(), soil_percentage);
   Serial.println(buffer);
   delay(60000);
 }