implemented a calibration process for the atomizer library

src/atomizer.h

@@ -1,28 +1,67 @@
 #include <Arduino.h>
+#include <corestats.h>
+#include <nanolog.h>
 
 /**
- * Simple controller library for an ultrasonic atomizer
- * used in atomizers, scent dispensers, etc.
+ * Simple controller library for a cheap 
+ * ultrasonic atomizer used in humidifiers, 
+ * scent dispensers, etc.
  * 
  * studio derfunke (c) 2022
  */
 class Atomizer {
   int pinSwitch;
   int pinSensor;
-  u_int lastToggle; // since last toggle action
+  u_int lastToggle; // timestamp of last toggle action
+
+  MinMaxScaler minmax;
 
   public:
-    Atomizer(int pin) : pinSwitch(pin) {
+    Atomizer(int pin1, int pin2) 
+      : pinSwitch(pin1), 
+        pinSensor(pin2) {
+
+      pinMode(PIN_ATOMIZER, OUTPUT);
+      pinMode(PIN_ATOMIZER_LDR, INPUT);
     }
 
-    bool debug() {
+    void debug() {
       int ldr = analogRead(pinSensor);
-      Serial.print(ldr);
+      LOG(ldr); LOG_NEW_LINE
+    }
+
+    void calibrate() {
+      int reading;
+      float s;
+      int i, j;
+
+      LOG("Calibrating atomizer actuation..."); LOG_NEW_LINE
+
+      for(i = 0; i < 5; i++) {
+        LOG("Calibration loop "); LOG(i); LOG_NEW_LINE
+
+        // do some readings on current state
+        for(int i = 0; i < 10; i++) {
+          reading = analogRead(pinSensor);
+          minmax.put( reading );
+        }
+
+        toggle(); // change state
+
+        // do some more readings
+        for(int i = 0; i < 10; i++) {
+          reading = analogRead(pinSensor);
+          minmax.put( reading );
+        }
+
+        toggle(); // change state again
+      } // how many calibration steps
     }
 
     bool is_on() {
       int ldr = analogRead(pinSensor);
-      return ldr > 300;
+      float s = minmax.put( ldr ); // run our value through a minmax scaler
+      return (s > 0.85);
     }
     
     u_int elapsed() {