+//timer interrupt calculator: http://www.8bit-era.cz/arduino-timer-interrupts-calculator.html
+//better one here: http://www.instructables.com/id/Arduino-Timer-Interrupts/ (but don't use the cli/sei commands)
+//pins D0 and D1 are reserved for hard serial RX/TX (respectively)
+const int sensorTics = 4;
+const int warningTics = 8;
+//pin assignments for the inputs of the 4 sensors
+const int S1 = 2; //sensor 1 input (fresh wood)
+const int S2 = 3; //sensor 2 input (start/stop cutting wood)
+const int S3 = 4; //sensor 3 input (start painting wood)
+const int S4 = 5; //sensor 4 input (stop painting wood)
+//pin assignments for the outputs
+const int motor_out = 6; //DC motor control out
+const int threeLEDs_out = 7; //3 LEDs for the "painting" portion
+const int warningLED_out = 8; //Light for notification of fresh wood
+//whether or not this is the first time on (since I reuse S2 for two different actions)
+//whether the motor is on, so I know which stage of S2 I am currently in
+//counters to count the Timer1 tics
+volatile int S1counter = 0;
+volatile int S2counter = 0;
+volatile int S3counter = 0;
+volatile int S4counter = 0;
+volatile int warningCounter = 0;
+//whether that particular stage is waiting on the interrupts to occur
+volatile bool S1int = false;
+volatile bool S2int = false;
+volatile bool S3int = false;
+volatile bool S4int = false;
+volatile bool warningInt = false;
+ pinMode(S1, INPUT_PULLUP); // sets the digital pin 2 as input
+ pinMode(S2, INPUT_PULLUP); // sets the digital pin 3 as input
+ pinMode(S3, INPUT_PULLUP); // sets the digital pin 4 as input
+ pinMode(S4, INPUT_PULLUP); // sets the digital pin 5 as input
+ pinMode(motor_out, OUTPUT); // sets the digital pin 6 as an output
+ digitalWrite(motor_out, LOW);
+ pinMode(threeLEDs_out, OUTPUT); // sets the digital pin 7 as an output
+ digitalWrite(threeLEDs_out, LOW);
+ pinMode(warningLED_out, OUTPUT); // sets the digital pin 8 as an output
+ digitalWrite(warningLED_out, LOW);
+ //setup serial port of 9600baud
+ Serial.begin(9600, SERIAL_8N1); // opens serial port, sets data rate to 9600 bps with 8-N-1
+ cli(); // stop interrupts
+ //set timer1 interrupt at 1Hz
+ TCCR1A = 0;// set entire TCCR1A register to 0
+ TCCR1B = 0;// same for TCCR1B
+ TCNT1 = 0;//initialize counter value to 0
+ // set compare match register for 1hz increments
+ OCR1A = 15624;// = (16*10^6) / (1*1024) - 1 (must be <65536)
+ TCCR1B |= (1 << WGM12);
+ // Set CS12 and CS10 bits for 1024 prescaler
+ TCCR1B |= (1 << CS12) | (1 << CS10);
+ // enable timer compare interrupt
+ TIMSK1 |= (1 << OCIE1A);
+ sei(); // allow interrupts
+ Serial.write("Commencing toy making!\n");
+ Serial.write("Kicking off warning light\n");
+ digitalWrite(warningLED_out, HIGH);
+ Serial.write("Turning motor on\n");
+ digitalWrite(motor_out, HIGH);
+ Serial.write("Turning motor off\n");
+ digitalWrite(motor_out, LOW);
+ Serial.write("Turning 3 LEDs on\n");
+ digitalWrite(threeLEDs_out, HIGH);
+ Serial.write("Turning 3 LEDs off\n");
+ digitalWrite(threeLEDs_out, LOW);
+ if(warningCounter >= warningTics)
+ digitalWrite(warningLED_out, LOW);
+ Serial.write("Turning off warning light\n");
+ if(S1counter >= sensorTics)
+ if(S2counter >= sensorTics)
+ if(S3counter >= sensorTics)
+ if(S4counter >= sensorTics)
+ Serial.write("Detecting S2, but don't know which position it is in yet....\n");
