I would greatly appreciate any help on this. I am working on a kegerator project, because i like to drink, build stuff, and mess with computers, its only natural.
The arduino will control the temperature of the kegerator, display the temperature on a 1.8" tft, also show pictures of the beer being dispensed, while its dispensing.
I will use relays to HOPEFULLY control electronic valves instead of actual taps. The main reason for this is because i want to be able to lock the thing so that my kids, neighbors kids, or even drunk neighbors don't wander into the garage and drink my beer.
I have made most of it work so far. but now im stuck.
PROBLEM: I have created an interrupt that powers the relay to open the valve, but first checks the "Lock" value. I am using the keypad pin code to control that value as 0 = not locked and 1 = locked.
There is another interrupt that calls for the keypad to get the key. It seems though that it does not give it any time at all for the key to be entered and returns to the main loop. Since i don't expect any critical temperature change to happen over a short amount of time it would not be and issue for it to wait for a bit to receive the key. What it CANNOT do is wait indefinitely for a code to be entered without returning to the loop, this would cause temperature issues. I have tried various wait loops, for loops, and just plain delay to give it time to receive the pin code. All have failed.
Can anyone give me even a hint as to where to move from here?
I included a VERY cleaned up version of my code so all the other mumbo jumbo is not a distraction, just enough for the concept of what im doing to show, so that its easier for you guys to see what im doing wrong.
#include <Password.h>
#include <Keypad.h>
Password password = Password( "4321" );
const byte ROWS = 4;
const byte COLS = 3;
char keys[ROWS][COLS] = {
{'1','2','3',},
{'4','5','6',},
{'7','8','9',},
{'*','0',' ',}
};
byte rowPins[ROWS] = {22, 23, 24, 25};
byte colPins[COLS] = {26, 27, 28};
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
volatile int Locked = 1;
const int Relay5 = 42;
long debouncing_time = 15;
volatile unsigned long last_micros;
void setup(){
Serial.begin(9600);
pinMode (Relay5, OUTPUT);
digitalWrite(Relay5, HIGH);
keypad.addEventListener(keypadEvent);
keypad.setDebounceTime(250);
attachInterrupt(1, PinCode, FALLING);
attachInterrupt(2, Button1press, FALLING);
}
void loop(){
Serial.println("Pretend there is alot of other stuff going on here.");
delay(5000);
//Temperature readings, screen displaying temps images, relays controling cooling, blah blah stuff.
}
void PinCode(){
if((long)(micros() - last_micros) >= debouncing_time *1000) {
Serial.println("ENTER PIN");
keypad.getKey();
}
last_micros = micros();
attachInterrupt(1, PinCode, CHANGE);
}
void keypadEvent(KeypadEvent eKey){
switch (keypad.getState()){
case PRESSED:
switch (eKey){
case ' ': guessPassword(); break;
default:
password.append(eKey);
}
}}
void guessPassword(){
if (password.evaluate()){
Locked = 0;
Serial.println("VALID PASSWORD ");
Serial.println(Locked);
password.reset();
}
else{
Locked = 1;
Serial.println("INVALID PASSWORD ");
Serial.println(Locked);
password.reset();
}}
void Button1press() {
if((long)(micros() - last_micros) >= debouncing_time *1000) {
if(Locked == 0) {digitalWrite(Relay5, LOW);}
attachInterrupt(2, Button1release, RISING);
}
last_micros = micros();
}
void Button1release() {
if((long)(micros() - last_micros) >= debouncing_time *1000) {
digitalWrite(Relay5, HIGH);
attachInterrupt(2, Button1press, FALLING);
}
last_micros = micros();
}
