2 GPIO via 1-Wire BUS - DS2413

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• DESCRIPTION

  You're too cool for I2C, and SPI has so many wires, 8-bit parallel... how can that be fashionable!? You are a 1-Wire kinda gal, and you want more 1-Wire breakouts in your life to complement all of your great engineering. Well rock on, because here you go, it's a 1-Wire controller with two open-drain GPIO.
  
  They are open-drain, so if you want to power an LED or something, you'll need a remote power supply (see Maxim's product page for more details)
  
  We have a basic Arduino sketch that uses the OneWire library to communicate with this chip. Don't forget to add the 4.7Kohm resistor from I/O to your 1-Wire controller power supply (3.3V - 5V) on the Arduino side of the wires.
  
  

  DS2413 1-Wire Two GPIO Controller Breakout (4:45)

• TECHNICAL DETAILS

  • Dimensions: 15.78mm / 0.62" x 9.96mm / 0.39" x 2.94mm / 0.11"

   

  #include <OneWire.h>
  
  #define DS2413_ONEWIRE_PIN  (8)
  
  #define DS2413_FAMILY_ID    0x3A
  #define DS2413_ACCESS_READ  0xF5
  #define DS2413_ACCESS_WRITE 0x5A
  #define DS2413_ACK_SUCCESS  0xAA
  #define DS2413_ACK_ERROR    0xFF
  
  OneWire oneWire(DS2413_ONEWIRE_PIN);
  uint8_t address[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
  
  void printBytes(uint8_t* addr, uint8_t count, bool newline = 0)
  {
    for (uint8_t i = 0; i < count; i++)
    {
      Serial.print(addr[i] >> 4, HEX);
      Serial.print(addr[i] & 0x0f, HEX);
      Serial.print(" ");
    }
    if (newline)
    {
      Serial.println();
    }
  }
  
  byte read(void)
  {
    bool ok = false;
    uint8_t results;
  
    oneWire.reset();
    oneWire.select(address);
    oneWire.write(DS2413_ACCESS_READ);
  
    results = oneWire.read();                 /* Get the register results   */
    ok = (!results & 0x0F) == (results >> 4); /* Compare nibbles            */
    results &= 0x0F;                          /* Clear inverted values      */
  
    oneWire.reset();
  
    // return ok ? results : -1;
    return results;
  }
  
  bool write(uint8_t state)
  {
    uint8_t ack = 0;
  
    /* Top six bits must '1' */
    state |= 0xFC;
  
    oneWire.reset();
    oneWire.select(address);
    oneWire.write(DS2413_ACCESS_WRITE);
    oneWire.write(state);
    oneWire.write(~state);                    /* Invert data and resend     */
    ack = oneWire.read();                     /* 0xAA=success, 0xFF=failure */
    if (ack == DS2413_ACK_SUCCESS)
    {
      oneWire.read();                          /* Read the status byte      */
    }
    oneWire.reset();
  
    return (ack == DS2413_ACK_SUCCESS ? true : false);
  }
  
  void setup(void)
  {
    Serial.begin(9600);
  
    Serial.println(F("Looking for a DS2413 on the bus"));
  
    /* Try to find a device on the bus */
    oneWire.reset_search();
    delay(250);
    if (!oneWire.search(address))
    {
      printBytes(address, 8);
      Serial.println(F("No device found on the bus!"));
      oneWire.reset_search();
      while (1);
    }
  
    /* Check the CRC in the device address */
    if (OneWire::crc8(address, 7) != address[7])
    {
      Serial.println(F("Invalid CRC!"));
      while (1);
    }
  
    /* Make sure we have a DS2413 */
    if (address[0] != DS2413_FAMILY_ID)
    {
      printBytes(address, 8);
      Serial.println(F(" is not a DS2413!"));
      while (1);
    }
  
    Serial.print(F("Found a DS2413: "));
    printBytes(address, 8);
    Serial.println(F(""));
  }
  
  void loop(void)
  {
    /* Read */
    /*
    uint8_t state = read();
    if (state == -1)
      Serial.println(F("Failed reading the DS2413"));
    else
      Serial.println(state, BIN);
    */
  
    /* Write */
    bool ok = false;
    ok = write(0x3);
    if (!ok) Serial.println(F("Wire failed"));
    delay(1000);
    ok = write(0x0);
    if (!ok) Serial.println(F("Wire failed"));
    delay(1000);
  }