Quiz System DIY Arduino Project for a Budget Price

/*
QuizSystem.c - automated quiz system for six participants

Copyright (c) 2014 Dmitry Pakhomenko.
dmitryp@magictale.com
http://magictale.com

This code is in the public domain.
*/

#define BTN_1 62	//PK0 PCINT16
#define BTN_2 63	//PK1 PCINT17
#define BTN_3 64	//PK2 PCINT18
#define BTN_4 65	//PK3 PCINT19
#define BTN_5 66	//PK4 PCINT20
#define BTN_6 67	//PK5 PCINT21

#define LED_1 8
#define LED_2 9
#define LED_3 10
#define LED_4 11
#define LED_5 12
#define LED_6 13

const char PRODUCT_NAME[] PROGMEM = "QuizSystem";
const char SPACE_CHAR[] PROGMEM = " ";
const char FIRMWARE_REV[] PROGMEM = "V1.0";
const char FIRMWARE_DATE[] PROGMEM = "22.07.14";
const char COMPANY_URL[] PROGMEM = "http://magictale.com";
const char BTN_PREFIX[] PROGMEM = "BTN: ";
const char INITIAL_STATE[] PROGMEM = "INITIAL STATE";

#define MAIN_LOOP_DELAY 2000
#define SECONDS_IN_SHOWING_RESULTS_STATE 5 * 5 //ToDo: not really in seconds at the moment...

enum enum_SysState
{
sysSelfTest,
sysInitial,
sysQuiz,
sysShowResult,
sysFailure
};

volatile uint8_t sysState;        //current system state (mode)
volatile uint8_t initStateTimer;  //seconds remaining before going to back to initial state
volatile uint8_t btnTriggered;    //flag indicates that a button press was detected
volatile uint8_t btnReg;          //button register;
volatile uint8_t testState;

void serialEvent()
{
while (Serial.available() > 0)
{
//dump the received byte for now
Serial.read();
}
}

void initLEDs()
{
analogWrite(LED_1, 0);
analogWrite(LED_2, 0);
analogWrite(LED_3, 0);
analogWrite(LED_4, 0);
analogWrite(LED_5, 0);
analogWrite(LED_6, 0);
}

void setup()
{
analogReference(DEFAULT);

//Set up 6 button inputs with pullup resistors
pinMode(BTN_1, INPUT_PULLUP);
pinMode(BTN_2, INPUT_PULLUP);
pinMode(BTN_3, INPUT_PULLUP);
pinMode(BTN_4, INPUT_PULLUP);
pinMode(BTN_5, INPUT_PULLUP);
pinMode(BTN_6, INPUT_PULLUP);

//Enable interrupts for buttons
PCICR |= _BV(PCIE2);
PCMSK2 |= _BV(PCINT16);
PCMSK2 |= _BV(PCINT17);
PCMSK2 |= _BV(PCINT18);
PCMSK2 |= _BV(PCINT19);
PCMSK2 |= _BV(PCINT20);
PCMSK2 |= _BV(PCINT21);

pinMode(LED_1, OUTPUT);
pinMode(LED_2, OUTPUT);
pinMode(LED_3, OUTPUT);
pinMode(LED_4, OUTPUT);
pinMode(LED_5, OUTPUT);
pinMode(LED_6, OUTPUT);

initLEDs();

sysState = sysSelfTest;

Serial.begin(57600);

Serial.print(reinterpret_cast<const __FlashStringHelper *>(PRODUCT_NAME));
Serial.print(reinterpret_cast<const __FlashStringHelper *>(SPACE_CHAR));
Serial.print(reinterpret_cast<const __FlashStringHelper *>(FIRMWARE_REV));
Serial.print(reinterpret_cast<const __FlashStringHelper *>(SPACE_CHAR));
Serial.println(reinterpret_cast<const __FlashStringHelper *>(FIRMWARE_DATE));
Serial.println(reinterpret_cast<const __FlashStringHelper *>(COMPANY_URL));

initStateTimer = 0;
btnTriggered = false;
testState = 0;
}

void handleBtnPress()
{
Serial.print(reinterpret_cast<const __FlashStringHelper *>(BTN_PREFIX));
Serial.println(btnReg, BIN);

if ((btnReg) & 0x1) digitalWrite(LED_6, HIGH);
else if ((btnReg >> 1) & 0x1) digitalWrite(LED_5, HIGH);
else if ((btnReg >> 2) & 0x1) digitalWrite(LED_4, HIGH);
else if ((btnReg >> 3) & 0x1) digitalWrite(LED_3, HIGH);
else if ((btnReg >> 4) & 0x1) digitalWrite(LED_2, HIGH);
else if ((btnReg >> 5) & 0x1) digitalWrite(LED_1, HIGH);
}

void demo()
{
while (1)
{
for (uint8_t pwm = 0; pwm < 255; pwm++)
{
initLEDs();

if (testState == 0) analogWrite(LED_1, pwm);
else if (testState == 1) analogWrite(LED_2, pwm);
else if (testState == 2) analogWrite(LED_3, pwm);
else if (testState == 3) analogWrite(LED_4, pwm);
else if (testState == 4) analogWrite(LED_5, pwm);
else if (testState == 5) analogWrite(LED_6, pwm);
else if (testState == 6)
{
analogWrite(LED_1, pwm);
analogWrite(LED_2, pwm);
analogWrite(LED_3, pwm);
analogWrite(LED_4, pwm);
analogWrite(LED_5, pwm);
analogWrite(LED_6, pwm);
}
delay(1);
}

for (uint8_t pwm = 255; pwm > 0; pwm--)
{
initLEDs();

if (testState == 0) analogWrite(LED_1, pwm);
else if (testState == 1) analogWrite(LED_2, pwm);
else if (testState == 2) analogWrite(LED_3, pwm);
else if (testState == 3) analogWrite(LED_4, pwm);
else if (testState == 4) analogWrite(LED_5, pwm);
else if (testState == 5) analogWrite(LED_6, pwm);
else if (testState == 6)
{
analogWrite(LED_1, pwm);
analogWrite(LED_2, pwm);
analogWrite(LED_3, pwm);
analogWrite(LED_4, pwm);
analogWrite(LED_5, pwm);
analogWrite(LED_6, pwm);
}
delay(1);
}

testState++;
if (testState > 6)
{
testState = 0;
break;
}
}
}

void loop()
{
if (millis() % MAIN_LOOP_DELAY == 0)
{
if (initStateTimer != 0) initStateTimer--;
}

switch (sysState)
{
case sysSelfTest:
{
demo();
break;
}

case sysQuiz:
{

break;
}

case sysShowResult:
{

if (btnTriggered)
{
handleBtnPress();
btnTriggered = false;
}

if (initStateTimer == 0)
{
sysState = sysQuiz;
initLEDs();
Serial.println(reinterpret_cast<const __FlashStringHelper *>(INITIAL_STATE));

}
}
break;

default:
;

}
}

ISR(PCINT2_vect)
{
cli();

btnReg = 0x7F & ~*portInputRegister(digitalPinToPort(BTN_1));

if (sysState == sysQuiz)
{
sysState = sysShowResult;
initStateTimer = SECONDS_IN_SHOWING_RESULTS_STATE;
btnTriggered = true;

}else if (sysState == sysSelfTest)
{
sysState = sysQuiz;
initLEDs();
}
sei();
}