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IICMasterRecv.ino

#include <Wire.h>
#define PY32 0xA0

void setup() {
  // put your setup code here, to run once:
  Serial.begin(76880);
  Wire.begin(12, 13);
}

void loop() {
  // put your main code here, to run repeatedly:
  PY32_Read();
  delay(500);
}

uint16_t PY32_Read() {
  byte data[2] = { 0 }, i = 0;
  uint16_t ret = 0;
  Wire.beginTransmission(PY32 >> 1);
  Wire.requestFrom(PY32 >> 1, 2);
  while (Wire.available()) data[i++] = Wire.read();
  ret = data[0] | (data[1] << 8);
  Serial.println(ret, HEX);
  return ret;
}

IICSearch.ino

#include <Wire.h>
#include "SlowSoftI2CMaster.h"

#define PY32 0xA0

SlowSoftI2CMaster si = SlowSoftI2CMaster(12, 13);

void setup() {
  Wire.begin(5, 4);
  Serial.begin(74880);
  Serial.println(F("Intializing ..."));
  if (!si.i2c_init())
    Serial.println(F("Initialization error. SDA or SCL are low"));
  else
    Serial.println(F("...done"));
}

void loop(void)
{
  uint8_t add = 0;
  int found = false;
  Serial.println("Scanning ...");

  Serial.println("       8-bit 7-bit addr");
  // try read
  do {
    if (si.i2c_start(add | I2C_READ)) {
      found = true;
      si.i2c_read(true);
      si.i2c_stop();
      Serial.print("Read:   0x");
      if (add < 0x0F) Serial.print(0, HEX);
      Serial.print(add+I2C_READ, HEX);
      Serial.print("  0x");
      if (add>>1 < 0x0F) Serial.print(0, HEX);
      Serial.println(add>>1, HEX);
    } else si.i2c_stop();
    add += 2;
  } while (add);

  // try write
  add = 0;
  do {
    if (si.i2c_start(add | I2C_WRITE)) {
      found = true;
      si.i2c_stop();
      Serial.print("Write:  0x");    
      if (add < 0x0F) Serial.print(0, HEX);  
      Serial.print(add+I2C_WRITE, HEX);
      Serial.print("  0x");
      if (add>>1 < 0x0F) Serial.print(0, HEX);
      Serial.println(add>>1, HEX);
    } else si.i2c_stop();
    si.i2c_stop();
    add += 2;
  } while (add);
  if (!found) Serial.println(F("No I2C device found."));
  Serial.println("Done\n\n");
  delay(1000);
}