here is _init.h
//these are our digital input pins
#define BUTTON1_PIN 2
#define BUTTON2_PIN 7
#define BUTTON3_PIN 4//these are our analog input pins
#define SLIDER1_PIN 2
#define SLIDER2_PIN 1
#define SLIDER3_PIN 0
#define LIGHT_SENSOR_PIN 3
#define TEMP_SENSOR_PIN 4
#define KNOCK_SENSOR_PIN 5//these are our output pins
#define LED1_PIN 6
#define LED2_PIN 5
#define BUZZER_PIN 3
#define SLIDER1_LED_PIN 11
#define SLIDER2_LED_PIN 10
#define SLIDER3_LED_PIN 9//these are for the shift register
#define LATCH_PIN 8
#define CLOCK_PIN 12
#define DATA_PIN 13//our init and bootup function
void ds_init()
{
//buttons are inputs.
pinMode(BUTTON1_PIN, INPUT);
pinMode(BUTTON2_PIN, INPUT);
pinMode(BUTTON3_PIN, INPUT);//leds and buzzers are outputs.
pinMode(LED1_PIN, OUTPUT);
pinMode(LED2_PIN, OUTPUT);
pinMode(BUZZER_PIN, OUTPUT);
pinMode(SLIDER1_LED_PIN, OUTPUT);
pinMode(SLIDER2_LED_PIN, OUTPUT);
pinMode(SLIDER3_LED_PIN, OUTPUT);//shift register pins are output.
pinMode(LATCH_PIN, OUTPUT);
pinMode(CLOCK_PIN, OUTPUT);
pinMode(DATA_PIN, OUTPUT);//flash our LEDs
digitalWrite(LED1_PIN, HIGH);
digitalWrite(LED2_PIN, HIGH);
digitalWrite(SLIDER1_LED_PIN, HIGH);
digitalWrite(SLIDER2_LED_PIN, HIGH);
digitalWrite(SLIDER3_LED_PIN, HIGH);//turn 7-segment on
digitalWrite(LATCH_PIN, LOW);
shiftOut(DATA_PIN, CLOCK_PIN, MSBFIRST, 255);
digitalWrite(LATCH_PIN, HIGH);//buzz for a bit.
for (byte i=0; i<255; i++)
{
digitalWrite(BUZZER_PIN, HIGH);
delayMicroseconds(1915);
digitalWrite(BUZZER_PIN, LOW);
}//turn off LEDs
digitalWrite(LED1_PIN, LOW);
digitalWrite(LED2_PIN, LOW);
digitalWrite(SLIDER1_LED_PIN, LOW);
digitalWrite(SLIDER2_LED_PIN, LOW);
digitalWrite(SLIDER3_LED_PIN, LOW);//turn 7-segment off
digitalWrite(LATCH_PIN, LOW);
shiftOut(DATA_PIN, CLOCK_PIN, MSBFIRST, 0);
digitalWrite(LATCH_PIN, HIGH);//startup serial
Serial.begin(9600);
Serial.println("started");
}