Absolute Encoder 12 Bits 18mm.

Video Test Encoder.

Example Code for Arduino

// absolute encoder 12 bits

// By Earth Electronics and www.thairoboshop.com

int CLK = 10; //Digital Pin 10

int DO  = 11; //Digital Pin 11

int CSn = 12; //Digital Pin 12

unsigned int reading;

void setup() {                

  Serial.begin(115200);

  pinMode(CSn, OUTPUT);   // Chip select

  pinMode(CLK, OUTPUT);   // Serial clock

  pinMode(DO, INPUT);   // Serial data IN/OUT   

  digitalWrite(CLK, HIGH);    

}

void loop() {

  unsigned int reading;

  int degree;

  ReadSSI();

  degree = map(reading, 0, 4095, 0, 359);

  Serial.print(reading,DEC); Serial.print("\t"); Serial.println(degree);

  delay(10);

}

void ReadSSI(void)

{

  int i;

  char Resolution = 12;

  unsigned int bitStart = 0x0800;

   reading = 0;

   digitalWrite(CSn, LOW);

   delayMicroseconds(1);

   digitalWrite(CLK, LOW);

   for(i=(Resolution-1);i>=0;i--)

   {

     digitalWrite(CLK, HIGH);

     delayMicroseconds(1);

     if (digitalRead(DO)) reading |= bitStart;   

     digitalWrite(CLK, LOW);

     bitStart = bitStart >> 1;

   if (i == 0) 

   {

     digitalWrite(CLK, HIGH);

     if (digitalRead(DO)) reading |= bitStart;   

     }

   }

   digitalWrite(CSn, HIGH);

}