/* Trinket Alarm Analog   An alarm system based on the Adafruit Trinket mini microcontroller

   This version uses three sensors (or sensor branches) connected to one analog line
      Annunciation is performed via the onboard LED and a Adafruit Bluefruit EZ-Link 
              
   A Trinket 3V is be used with a 3.7 volt LiPo battery and Adafruit charger connected to 5 volts
*/

#define SerialPin  0  // Serial debug via Bluefruit EZ-Link on this pin
#define LEDpin     1  // Use Trinket LED for displaying tripped sensors
#define SensorPin  3  // A3 which is GPIO #3 has resistor network to read 3 normally closed sensors

//#define DEBUG

// Serial code, use a Bluefruit EZ-Link with its RX pin connected to Pin 0 of Trinket 
//   You will need a terminal program (such as freeware PuTTY for Windows) to get the alerts
//   but better would be a Processing or Python script looking for alarms.
#include <SoftwareSerial.h>  // Software serial library (standard in Arduino 1.x +)
SoftwareSerial Serial(2,0);  // Serial transmission on Trinket Pin 0, receive pin 2 (not used)

// Multiplex 3 normally closed sensors on one analog pin.  If you have 2 sensors,
//   you can leave the one resistor open and adjust the text values accordingly
const uint8_t numSensors = 3;  //  number of sensors on analog line
const uint8_t states = 8;      //  2^numsensors
uint16_t values[8] = {541,  685,  661, 614,     840,    780,  776,  997};
char *textval[8] =   {"Set","PIR", "2", "3", "PIR+2","PIR+3","2+3","All"};
 
void setup() {
  pinMode(LEDpin, OUTPUT);        // Set GPIO 1 to output to blink LED
  pinMode(SensorPin, INPUT);      // sets analog pin for input 
  Serial.begin(9600);             // Send status information via serial
  Serial.println("Alarm System"); // Initialize message (can read to determine reset)
}
 
void loop()
{
  int8_t contact;                    // read alarm loops (returns -1 if a read error)
  contact = readContact(SensorPin);  //
 
  if(contact >= 1) {                 // if any value greater than 0 (set), 
       Blink(LEDpin, contact);       //    we have an alarm!  Blink LED corresponding to
       Serial.print("Alarm! ");      //    which sensor(s) and write to Bluetooth
       Serial.println(textval[contact]);
  }
  else if(contact < 0) {             // a bad analog read was done.  If you get errors
       Serial.print("Error");        //   set DEBUG, walk test, record values, and
  }                                  //   update code with analogread values
  else {
       Serial.println("Set");          // Alarm is set (no sensors tripped), all is well
  }

  delay(500);  // We do not need to poll the sensors very often although you can change
}

int8_t readContact(uint8_t TrinketPin)
// returns the number corresponding to sensor values.
// TrinketPin is the analog pin on the Trinket (A1=#2, A2=#4, A3=#3)
{
  const int variance = 8;  // Analog readings can vary, use this value for +- variance
  int contact = 0;
  uint16_t readval = 0;
  readval = analogRead(TrinketPin); // Check the pin
#ifdef DEBUG
  Serial.print(": Sensor read value: ");
  Serial.println(readval);
#endif
  for(uint8_t i=0; i<states; i++) {  // if reading is near state value, return that state
    if(readval >= (values[i]-variance) && readval <= (values[i]+variance) ) {
      return(i);
      }
  }
  return -1; // value not one of the alarm system values
}

// This routine toggkes a pin the number you pass.  Good to use on LED pin to
//   output which sensors are triggered
void Blink(uint8_t pin, uint8_t times) {
  for(uint8_t i=1; i<=times; i++) {
     digitalWrite(pin, HIGH);
     delay(85);
     digitalWrite(pin, LOW);
     delay(85);
  }
}

/* Trinket Alarm Analog   An alarm system based on the Adafruit Trinket mini microcontroller

   This version uses three sensors (or sensor branches) connected to one analog line
      Annunciation is performed via the onboard LED and a Adafruit Bluefruit EZ-Link 
              
   A Trinket 3V is be used with a 3.7 volt LiPo battery and Adafruit charger connected to 5 volts
*/

#define SerialPin  0  // Serial debug via Bluefruit EZ-Link on this pin
#define LEDpin     1  // Use Trinket LED for displaying tripped sensors
#define SensorPin  3  // A3 which is GPIO #3 has resistor network to read 3 normally closed sensors

//#define DEBUG

// Serial code, use a Bluefruit EZ-Link with its RX pin connected to Pin 0 of Trinket 
//   You will need a terminal program (such as freeware PuTTY for Windows) to get the alerts
//   but better would be a Processing or Python script looking for alarms.
#include <SoftwareSerial.h>  // Software serial library (standard in Arduino 1.x +)
SoftwareSerial Serial(2,0);  // Serial transmission on Trinket Pin 0, receive pin 2 (not used)

// Multiplex 3 normally closed sensors on one analog pin.  If you have 2 sensors,
//   you can leave the one resistor open and adjust the text values accordingly
const uint8_t numSensors = 3;  //  number of sensors on analog line
const uint8_t states = 8;      //  2^numsensors
uint16_t values[8] = {541,  685,  661, 614,     840,    780,  776,  997};
char *textval[8] =   {"Set","PIR", "2", "3", "PIR+2","PIR+3","2+3","All"};
 
void setup() {
  pinMode(LEDpin, OUTPUT);        // Set GPIO 1 to output to blink LED
  pinMode(SensorPin, INPUT);      // sets analog pin for input 
  Serial.begin(9600);             // Send status information via serial
  Serial.println("Alarm System"); // Initialize message (can read to determine reset)
}
 
void loop()
{
  int8_t contact;                    // read alarm loops (returns -1 if a read error)
  contact = readContact(SensorPin);  //
 
  if(contact >= 1) {                 // if any value greater than 0 (set), 
       Blink(LEDpin, contact);       //    we have an alarm!  Blink LED corresponding to
       Serial.print("Alarm! ");      //    which sensor(s) and write to Bluetooth
       Serial.println(textval[contact]);
  }
  else if(contact < 0) {             // a bad analog read was done.  If you get errors
       Serial.print("Error");        //   set DEBUG, walk test, record values, and
  }                                  //   update code with analogread values
  else {
       Serial.println("Set");          // Alarm is set (no sensors tripped), all is well
  }

  delay(500);  // We do not need to poll the sensors very often although you can change
}

int8_t readContact(uint8_t TrinketPin)
// returns the number corresponding to sensor values.
// TrinketPin is the analog pin on the Trinket (A1=#2, A2=#4, A3=#3)
{
  const int variance = 8;  // Analog readings can vary, use this value for +- variance
  int contact = 0;
  uint16_t readval = 0;
  readval = analogRead(TrinketPin); // Check the pin
#ifdef DEBUG
  Serial.print(": Sensor read value: ");
  Serial.println(readval);
#endif
  for(uint8_t i=0; i<states; i++) {  // if reading is near state value, return that state
    if(readval >= (values[i]-variance) && readval <= (values[i]+variance) ) {
      return(i);
      }
  }
  return -1; // value not one of the alarm system values
}

// This routine toggkes a pin the number you pass.  Good to use on LED pin to
//   output which sensors are triggered
void Blink(uint8_t pin, uint8_t times) {
  for(uint8_t i=1; i<=times; i++) {
     digitalWrite(pin, HIGH);
     delay(85);
     digitalWrite(pin, LOW);
     delay(85);
  }
}