#include <LedControl.h>

#define DATA_PIN 12
#define CLK_PIN 11
#define CS_PIN 10
#define NUM_CHIPS 1
#define ADDR 0

LedControl lc = LedControl(DATA_PIN, CLK_PIN, CS_PIN, NUM_CHIPS);
unsigned long data = 1;


void setup() {
  lc.shutdown(0,false); 
  lc.setIntensity(0,8);
  Serial.begin(9600);
}

void loop() {
  //loadRandomDataIntoArray();
  updatePots();
  updateLed();
  //delay(250);
  //lc.clearDisplay(ADDR);
}


void updateLed(){
  //write data to first 2 columns of the display  
  lc.setColumn(ADDR,0,data); //sets first column to first byte (LSB at bottom)
  lc.setColumn(ADDR,1,data>>8); //sets next column to 2nd byte, (LSB at bottom)

}

void updatePots(){
  int analogValue = analogRead(A0);  //read input value
  int scaledValue = map(analogValue,0,1023,0,15); //scales 10 bit input to 16 bits

  data = 0; //clear data
  bitSet(data, scaledValue); //set one bit only
}