// on road work mode flash orange light only at all junction
void FlashForRoadWork() {
static Counter roadWorkCounter;
// flash the orange light by checking the counter time
if(roadWorkCounter.GetCounter() <= 500) {
trafficLight0.RoadWorkLightOnly();
trafficLight90.RoadWorkLightOnly();
trafficLight270.RoadWorkLightOnly();
}
else if(roadWorkCounter.GetCounter() <= 1000) {
trafficLight0.ledOrange.SwitchOff();
trafficLight90.ledOrange.SwitchOff();
trafficLight270.ledOrange.SwitchOff();
}
else
roadWorkCounter.Reset();
}
// on ped crossing mode when time is finished flash ped light at all junction
void FlashForPedCrossFinish() {
static Counter pedCrossCounter;
// flash the ped light by checking the counter time
if(pedCrossCounter.GetCounter() <= 500) {
trafficLight270.ledPed.SwitchOn();
trafficLight0.ledPed.SwitchOn();
trafficLight90.ledPed.SwitchOn();
}
else if(pedCrossCounter.GetCounter() <= 1000) {
trafficLight0.ledPed.SwitchOff();
trafficLight90.ledPed.SwitchOff();
trafficLight270.ledPed.SwitchOff();
}
else
pedCrossCounter.Reset();
}
// Method is called when the obeservable object has a change in its state
void CounterObserver::Update(Observable* obj)
{
Counter* pCounter = dynamic_cast<Counter*>(obj);
if(pCounter != NULL)
std::cout << "Observer address : " << this << " Counter has changed : " << pCounter->GetCounter() << std::endl;
else
std::cout << "Unknown observable" << std ::endl;
}
// this function simulates normal light condition when called at every loop
// it automatically transitions from green to red signal by using the OrangeTransitionCounter
void UpdateWithLightTransition(bool goSignal, bool turnLight, bool pedLight, int orangeLightTime) {
// if green or go signal turn off transitioning process
// and only light up the green light
if (goSignal) {
transitionState = 0;
GreenLight();
}
// if red signal and green light was previously on
// start transitioning to red by firt turning on the
// orange light
else if(!goSignal && ledGreen.IsOn() && transitionState == 0) {
OrangeLight();
transitionState = 1;
OrangeTransitionCounter.Reset();
}
// if red signal and greenlight was not on, directly
// switch on the red light
else if(!goSignal && !ledGreen.IsOn() && transitionState == 0)
RedLight();
// check if we are still transitioning to red light
// if orangeTransitionCounter has passed orangeLightTime interval
// turn on the Red light only
if (transitionState == 1) {
if (OrangeTransitionCounter.GetCounter() < orangeLightTime)
OrangeLight();
else
transitionState = 2;
}
if (transitionState == 2)
RedLight();
if (turnLight)
ledFilterTurn.SwitchOn();
else
ledFilterTurn.SwitchOff();
// ped lights turn on only when the normal lights are in red signal
if (pedLight && ledRed.IsOn())
ledPed.SwitchOn();
else
ledPed.SwitchOff();
}
// Update normal light sequence by checking the main counter
int UpdateNormalSequence(int goLightTime) {
int i = 1;
while (mainCounter.GetCounter() > i * goLightTime)
i++;
// On Select Sequence Button, cycle through the sequences immediately
if (btnSelectSequence.IsPressed()) {
// reset the main counter to start of new sequence
mainCounter.Reset(i * goLightTime);
i++;
}
// if maximum sequences has reached reset the main counter
if (i == MAX_SEQUENCES + 1) {
mainCounter.Reset();
i = 1;
}
return i;
}
void loop() {
delay(50);
boolean hotDay = ther.GetKelvinTempUsingHart() >= THER_CRITICAL_DEG;
boolean nightMode = ldr.ReadADC() <= LDR_DARK_ADC;
static int goLightTimeCalibed = DEFAULT_GO_LIGHT_TIME;
static int orangeLightTimeCalibed = DEFAULT_ORANGE_LIGHT_TIME;
// if both emergency button and road work are pressed activate the calibration
if (btnEmergency.IsPressed() && btnRoadWork.IsPressed()) {
goLightTimeCalibed = map(pot.ReadADC(), 0, 1023, DEFAULT_GO_LIGHT_TIME/2, DEFAULT_GO_LIGHT_TIME * 2);
orangeLightTimeCalibed = map(pot.ReadADC(), 0, 1023, DEFAULT_ORANGE_LIGHT_TIME/2, DEFAULT_ORANGE_LIGHT_TIME * 2);
}
else {
boolean emergencyMode = btnEmergency.ReadSwitch();
boolean roadWorkMode = btnRoadWork.ReadSwitch();
if (emergencyMode) {
OnEmergencyMode();
}
if (roadWorkMode) {
FlashForRoadWork();
}
// pause the main counter when one of the modes are activated
if(roadWorkMode || emergencyMode) {
mainCounter.Pause();
return;
}
}
int goLightTime = goLightTimeCalibed;
int orangeLightTime = orangeLightTimeCalibed;
double multiplier = 1.0;
if (nightMode) {
multiplier += 0.4;
}
if(hotDay) {
multiplier += 0.3;
}
// extended the go or green signal time and the orange light time
int goLightTime = goLightTimeCalibed * multiplier;
int orangeLightTime = orangeLightTimeCalibed * multiplier;
// get the current state of the sequence
int state = UpdateNormalSequence(goLightTime);
// print out the state of the system for debugging
Serial.print("Temperature: ");
Serial.print(ther.GetKelvinTempUsingHart());
Serial.print(" LDR: ");
Serial.print(ldr.ReadADC());
Serial.print(" PotADC: ");
Serial.print(pot.ReadADC());
Serial.print(" Cross: ");
Serial.print(btnPedCross0.IsPressed() || btnPedCross90.IsPressed() || btnPedCross270.IsPressed());
Serial.print(" main Counter: ");
Serial.print(mainCounter.GetCounter());
Serial.print(" goTime: ");
Serial.print(goLightTime);
Serial.print(" Orange: ");
Serial.print(orangeLightTime);
Serial.print(" state: ");
Serial.println(state);
// if alarm is in progress, exit from normal sequence
if (AddPedCrossStageOnRequest(state, goLightTime, orangeLightTime))
return;
// unpause the main counter if it was paused
mainCounter.UnPause();
// update the leds on the traffic light depending on the values in the sequence array
trafficLight270.UpdateWithLightTransition(sequence[state - 1][0], sequence[state - 1][1], sequence[state - 1][2], orangeLightTime);
trafficLight0.UpdateWithLightTransition(sequence[state - 1][3], sequence[state - 1][4], sequence[state - 1][5], orangeLightTime);
trafficLight90.UpdateWithLightTransition(sequence[state - 1][6], sequence[state - 1][7], sequence[state - 1][8], orangeLightTime);
}
// function to allow for ped crossing on the press of a button
// ped crossing works by pausing the main counter at the end of a sequence
// and resuming after the ped has crossed.
// returns whether alarm is currently on progression or not
bool AddPedCrossStageOnRequest(int state, int pedCrossTime, int orangeLightTime){
#define NO_PED_CROSS 0
#define PED_CROSS_BTN_PRESSED 1
#define PED_CROSS_IN_PROGRESS 2
static int alarmState = 0;
// check for button presses at all the junctions
if(btnPedCross0.IsPressed() || btnPedCross90.IsPressed() || btnPedCross270.IsPressed())
if (alarmState == NO_PED_CROSS) alarmState = PED_CROSS_BTN_PRESSED;
// update the buzzer asyncronously
trafficLight0.crossingBuzzer.UpdateAsync();
trafficLight90.crossingBuzzer.UpdateAsync();
trafficLight270.crossingBuzzer.UpdateAsync();
static int prevState = 0;
static Counter pedCrossCounter;
// check if the current sequence has ended
if (prevState != state && alarmState == PED_CROSS_BTN_PRESSED) {
// pause the timer
mainCounter.Pause();
// reset the crossing counter to 0
pedCrossCounter.Reset();
// activate the flag to transition all the green signal to red first
alarmState = PED_CROSS_IN_PROGRESS;
return true;
}
if (alarmState == PED_CROSS_IN_PROGRESS) {
if (pedCrossCounter.GetCounter() <= pedCrossTime) {
// if there were no green lights from the previous sequence, directly turn on the red light
if (trafficLight0.ledRed.IsOn() && trafficLight90.ledRed.IsOn() && trafficLight270.ledRed.IsOn())
{
trafficLight270.UpdateWithLightTransition(0, 0, 1, orangeLightTime);
trafficLight0.UpdateWithLightTransition(0, 0, 1, orangeLightTime);
trafficLight90.UpdateWithLightTransition(0, 0, 1, orangeLightTime);
trafficLight0.crossingBuzzer.TriggerAlarm();
trafficLight90.crossingBuzzer.TriggerAlarm();
trafficLight270.crossingBuzzer.TriggerAlarm();
}
// if there were green lights on the previous sequence, transition to red first
else {
trafficLight270.UpdateWithLightTransition(0, 0, 0, orangeLightTime);
trafficLight0.UpdateWithLightTransition(0, 0, 0, orangeLightTime);
trafficLight90.UpdateWithLightTransition(0, 0, 0, orangeLightTime);
trafficLight0.crossingBuzzer.TurnOffAlarm();
trafficLight90.crossingBuzzer.TurnOffAlarm();
trafficLight270.crossingBuzzer.TurnOffAlarm();
}
return true;
}
// if ped cross time has finish blink the ped light as in australian ped crossing
else if (pedCrossCounter.GetCounter() <= pedCrossTime + orangeLightTime) {
FlashForPedCrossFinish();
trafficLight0.crossingBuzzer.TurnOffAlarm();
trafficLight90.crossingBuzzer.TurnOffAlarm();
trafficLight270.crossingBuzzer.TurnOffAlarm();
return true;
}
else {
alarmState = NO_PED_CROSS;
}
}
prevState = state;
return false;
}