added SmartDial for handling numerical inputs, basic state system and SmartDisplay utils

src/SmartDial.cpp

@@ -0,0 +1,58 @@
+#include "SmartDial.hpp"
+
+SmartDial::SmartDial(int pin)
+{
+    m_pin = pin;
+}
+// Returns a value between 0 and 6 (inclusive)
+int SmartDial::getValue()
+{
+    int v = analogRead(m_pin);
+    int mapped = map(v, 30, 1024, 0, 6);
+    return mapped;
+}
+
+// Returns whether the value is currently increasing (1 to 3), decreasing (-1 to -3) or stable (0).
+int SmartDial::smoothEdit(int *out_value, int t_min, int t_max)
+{
+    bool edit = false;
+    if (millis() >= next_step_time)
+    {
+        next_step_time = millis() + m_interval;
+        edit = true;
+    }
+
+    int value = getValue();
+    m_interval = 500;
+    if (value < 3)
+    {
+        if (edit && *out_value - 1 >= t_min)
+            (*out_value)--;
+        int speedSetting = (value + 3) - 6; // -3, -2, -1
+        m_interval = getDelayFromSpeed(speedSetting);
+        return speedSetting;
+    }
+    if (value > 3)
+    {
+        if (edit && *out_value + 1 <= t_max)
+            (*out_value)++;
+        int speedSetting = (value - 3); // 3, 2, 1
+        m_interval = getDelayFromSpeed(speedSetting);
+        return speedSetting;
+    }
+    return 0;
+}
+
+int SmartDial::getDelayFromSpeed(int speedSetting)
+{
+    switch (abs(speedSetting))
+    {
+    case 1:
+        return 1000;
+    case 2:
+        return 500;
+    case 3:
+        return 100;
+    }
+    return 0;
+}

src/SmartDial.hpp

@@ -0,0 +1,17 @@
+#pragma once
+#include <Arduino.h>
+
+class SmartDial
+{
+public:
+    SmartDial(int pin);
+    // Returns a value between 0 and 6 (inclusive)
+    int getValue();
+    int smoothEdit(int *out_value, int t_min, int t_max);
+
+private:
+    int m_pin;
+    unsigned long m_interval = 500;
+    unsigned long next_step_time = 0;
+    int getDelayFromSpeed(int speedSetting);
+};

src/SmartDisplay.cpp

@@ -0,0 +1,37 @@
+#include "SmartDisplay.hpp"
+
+SmartDisplay::SmartDisplay(Adafruit_SSD1306 *display)
+{
+    m_display = display;
+}
+
+void SmartDisplay::printTeaConfigScreen(int steepingSeconds, int editDir)
+{
+    m_display->clearDisplay();
+    m_display->setTextColor(WHITE);
+    m_display->setTextSize(1);
+    m_display->setCursor(0, 0);
+
+    m_display->println("Premium Earl Grey");
+    m_display->println(" ");
+
+    m_display->setTextSize(2);
+    m_display->print(steepingSeconds);
+    m_display->print(" ");
+
+    if (editDir > 0)
+    {
+        for (int i = 0; i < editDir; i++)
+        {
+            m_display->print("+");
+        }
+    }
+    if (editDir < 0)
+    {
+        for (int i = editDir; i < 0; i++)
+        {
+            m_display->print("-");
+        }
+    }
+    m_display->display();
+}

src/SmartDisplay.hpp

@@ -0,0 +1,13 @@
+#pragma once
+#include <Adafruit_GFX.h>
+#include <Adafruit_SSD1306.h>
+
+class SmartDisplay {
+    public:
+        SmartDisplay(Adafruit_SSD1306 *display);
+        void printTeaConfigScreen(int steepingSeconds, int editDir);
+        void printAddNewTeaScreen();
+        void printSteepingInProgressScreen();
+    private:
+        Adafruit_SSD1306 *m_display;
+};

src/main.cpp

@@ -7,12 +7,15 @@
 
 #include "TeaTimer.hpp"
 #include "ContinuousServo.hpp"
+#include "SmartDial.hpp"
+#include "SmartDisplay.hpp"
 
 #define WIRE Wire
 
 #define DISPLAY_PIN 4        // D2 (SDA)
 #define SERVO_PIN 0          // D3
 #define TOUCH_BTN_PIN 16     // D0
+#define POTENTIOMETER_PIN A0 // A0
 
 // RFID
 #define RST_PIN 2                 // D4
@@ -25,20 +28,23 @@ auto display = Adafruit_SSD1306(128, 32, &WIRE);
 
 ContinuousServo contServo(SERVO_PIN);
 TeaTimer teaTimer;
+SmartDial smartDial(POTENTIOMETER_PIN);
+SmartDisplay smartDisplay(&display);
+
+enum State
+{
+  WAIT_FOR_RFID_SCAN,
+  DISPLAY_SCANNED_TEA_CONFIG,
+  ADD_NEW_TEA_CONFIG,
+  STEEPING_IN_PROGRESS,
+};
+State state = State::DISPLAY_SCANNED_TEA_CONFIG;
 
 void serial_dump_byte_array(byte *buffer, byte bufferSize);
+void oled_dump_byte_array(byte *buffer, byte bufferSize);
 void printMsg(const String &s);
 void printMsg(unsigned long l);
 
-void oled_dump_byte_array(byte *buffer, byte bufferSize)
-{
-  for (byte i = 0; i < bufferSize; i++)
-  {
-    display.print(buffer[i] < 0x10 ? " 0" : " ");
-    display.print(buffer[i], HEX);
-  }
-}
-
 void setup()
 {
   Serial.begin(9600);
@@ -100,8 +106,32 @@ bool isBtnPressed()
   return digitalRead(TOUCH_BTN_PIN) == HIGH;
 }
 
+int steepingSeconds = 60;
 void loop()
 {
+
+  switch (state)
+  {
+  case WAIT_FOR_RFID_SCAN:
+  {
+    break;
+  }
+  case DISPLAY_SCANNED_TEA_CONFIG:
+  {
+    int dir = smartDial.smoothEdit(&steepingSeconds, 0, 120);
+    smartDisplay.printTeaConfigScreen(steepingSeconds, dir);
+    break;
+  }
+  case ADD_NEW_TEA_CONFIG:
+  {
+    break;
+  }
+  case STEEPING_IN_PROGRESS:
+  {
+    break;
+  }
+  };
+
   // Look for new cards
   if (!mfrc522.PICC_IsNewCardPresent())
     return;
@@ -120,9 +150,9 @@ void loop()
   display.setTextSize(1);
   display.setCursor(0, 10);
   display.println("Card UID: ");
-  oled_dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
+  // oled_dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
-  display.println();
+  // display.println();
-  display.display();
+  // display.display();
 
   // PICC type, e.g. "MIFARE 1K0"
   Serial.print(F("PICC type: "));
@@ -170,3 +200,11 @@ void serial_dump_byte_array(byte *buffer, byte bufferSize)
     Serial.print(buffer[i], HEX);
   }
 }
+void oled_dump_byte_array(byte *buffer, byte bufferSize)
+{
+  for (byte i = 0; i < bufferSize; i++)
+  {
+    display.print(buffer[i] < 0x10 ? " 0" : " ");
+    display.print(buffer[i], HEX);
+  }
+}