firmware/src/main.cpp

#include <Arduino.h>
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <MFRC522.h>

#include "TeaTimer.hpp"
#include "ContinuousServo.hpp"

#define WIRE Wire

#define DISPLAY_PIN 4    // D2 (SDA)
#define SERVO_PIN 0      // D3
#define TOUCH_BTN_PIN 16 // D0

// RFID
#define RST_PIN 2                 // D4
uint8_t scanDelay = 5;            // 5 second delay between reads
#define SS_PIN 15                 // D8
MFRC522 mfrc522(SS_PIN, RST_PIN); // create RFID instance
MFRC522::MIFARE_Key key;

auto display = Adafruit_SSD1306(128, 32, &WIRE);

ContinuousServo contServo(SERVO_PIN);
TeaTimer teaTimer;

void serial_dump_byte_array(byte *buffer, byte bufferSize);
void printMsg(const String &s);
void printMsg(unsigned long l);

void setup()
{
  Serial.begin(9600);

  Serial.println("Initializing SPI...");
  SPI.begin();

  Serial.println("Initializing RFID...");
  mfrc522.PCD_Init();
  Serial.print(F("Ver: 0x"));
  byte readReg = mfrc522.PCD_ReadRegister(mfrc522.VersionReg);
  Serial.println(readReg, HEX);

  Serial.println("Initializing OLED...");
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C, false); // Address 0x3C for 128x32
  printMsg("Tea is Great!");
  delay(3000);

  // Prepare the key (used both as key A and key B)
  for (byte i = 0; i < 6; i++)
  {
    key.keyByte[i] = 0xFF;
  }

  Serial.println(F("Scan a MIFARE Classic PICC to demonstrate basic recognition."));
  Serial.print(F("Using key (for A and B):"));
  serial_dump_byte_array(key.keyByte, MFRC522::MF_KEY_SIZE);
  Serial.println();

  // teaTimer.init(&contServo);

  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(TOUCH_BTN_PIN, INPUT);
}

void printMsg(const String &s)
{
  display.clearDisplay();
  display.setTextColor(WHITE);
  display.setTextSize(1);
  display.setCursor(0, 10);
  display.println(s);
  display.display();
}
void printMsg(unsigned long l)
{
  display.clearDisplay();
  display.setTextColor(WHITE);
  display.setTextSize(1);
  display.setCursor(0, 10);
  display.println(l);
  display.display();
}

bool isBtnPressed()
{
  if (millis() < 10000)
    return false;
  return digitalRead(TOUCH_BTN_PIN) == HIGH;
}

void loop()
{
  // Look for new cards
  if (!mfrc522.PICC_IsNewCardPresent())
    return;

  // Select one of the cards
  if (!mfrc522.PICC_ReadCardSerial())
    return;

  // Show some details of the PICC (that is: the tag/card)
  // UID is a unique four hex pairs, e.g. E6 67 2A 12
  Serial.print(F("Card UID:"));
  serial_dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
  display.println("Card UID: ");
  display.println();
  // PICC type, e.g. "MIFARE 1K0"
  Serial.print(F("PICC type: "));
  MFRC522::PICC_Type piccType = mfrc522.PICC_GetType(mfrc522.uid.sak);
  Serial.println(mfrc522.PICC_GetTypeName(piccType));

  // Halt PICC
  mfrc522.PICC_HaltA();

  Serial.print("Delay scanning...");
  delay(scanDelay * 1000); // Turn seconds into milliseconds
  Serial.println(" ...Ready to scan again!");

  /*
teaTimer.tick();

if (isBtnPressed() && !teaTimer.isSteeping())
{
teaTimer.beginSteeping(5000);
}
if (teaTimer.isSteeping())
{
auto r = teaTimer.remainingSteepTimeSeconds();
printMsg(r);
}
else
{
printMsg("Default");
}*/
}

void toggle_led()
{
  digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
}

/**
 * Helper routine to dump a byte array as hex values to Serial.
 */
void serial_dump_byte_array(byte *buffer, byte bufferSize)
{
  for (byte i = 0; i < bufferSize; i++)
  {
    Serial.print(buffer[i] < 0x10 ? " 0" : " ");
    Serial.print(buffer[i], HEX);
  }
}