### readCodes

Source: https://vdwulp.github.io/iButtonTag/REFERENCE.html

Starts the search for multiple iButtonCode’s on the data line.

```APIDOC
## int8_t readCodes()

### Description
Resets the domain to search for iButtonCode’s. This function is needed to start searching for codes again.

### Returns
- **1** - At least one iButton detected
- **0** - No iButton detected
```

--------------------------------

### Read iButton ID-code

Source: https://vdwulp.github.io/iButtonTag

Demonstrates initializing the iButtonTag library on a specific pin and reading the tag ID-code within the main loop.

```cpp
   #include <iButtonTag.h>                     // Include the library

   #define PIN_PROBE 2                         // Data line connected to pin 2

   iButtonTag ibutton( PIN_PROBE );            // Setup iButtonTag on the pin

   void setup(void) {
     Serial.begin(9600);
   }

   void loop(void) {
     iButtonCode code;                         // Variable to store ID-code

     Serial.println( "Reading... " );
     int8_t status = ibutton.readCode( code ); // Try to read ID-code

     if ( status > 0 ) {                       // Code read successfully
       Serial.print( "iButton code read: " );
       ibutton.printCode( code );              // ID-code is in variable _code_
       Serial.println();
     }
   }
```

--------------------------------

### nextCode

Source: https://vdwulp.github.io/iButtonTag/REFERENCE.html

Continues the search for multiple iButtonCode’s on the data line.

```APIDOC
## int8_t nextCode(iButtonCode code)

### Description
Continues the search for multiple iButtonCode’s on the data line. Use this to enumerate all iButtonCode’s after calling readCodes.

### Parameters
- **code** (iButtonCode) - Required - Variable to store code read from the data line.

### Returns
- **1** - Next iButton read successfully
- **0** - No more iButtons detected
- **-1** - Invalid iButton code (checksum failed)
- **-2** - Invalid iButton code (all zeros)
```

--------------------------------

### Constructor iButtonTag

Source: https://vdwulp.github.io/iButtonTag/REFERENCE.html

Constructs an iButtonTag object linked to the specified Arduino pin.

```APIDOC
## iButtonTag(uint8_t pin)

### Description
Constructs an iButtonTag object linked to the supplied pin.

### Parameters
- **pin** (uint8_t) - Required - Arduino pin number this iButtonTag object should be linked to.
```

--------------------------------

### int8_t writeCode(iButtonCode code, int8_t type, bool check)

Source: https://vdwulp.github.io/iButtonTag/REFERENCE.html

Writes a new iButtonCode to a (re)writable tag with optional type specification and safety checks.

```APIDOC
## int8_t writeCode(iButtonCode code, int8_t type, bool check)

### Description
Writes a new iButtonCode to a (re)writable tag. It is recommended to have only one tag connected during this operation.

### Parameters
- **code** (iButtonCode) - Required - The code to be written.
- **type** (int8_t) - Optional - iButton (re)writable tag type constant. Default is IBUTTON_UNKNOWN.
- **check** (bool) - Optional - Enables pre-write checks. Default is true.

### Returns
- **int8_t** - 1: Success; 0: No iButton detected; -1 to -9: Code-related errors; -11 to -19: Type-related errors; -21 to -29: Writing failure.
```

--------------------------------

### readCode

Source: https://vdwulp.github.io/iButtonTag/REFERENCE.html

Reads a single iButtonCode from the data line.

```APIDOC
## int8_t readCode(iButtonCode code, bool old)

### Description
Reads one single iButtonCode from the data line. Note that this function may return invalid readings if multiple iButtons are connected.

### Parameters
- **code** (iButtonCode) - Required - Variable to store code read from the data line.
- **old** (bool) - Optional - Setting to true enables compatibility with DS1990 iButton tags. Default is false.

### Returns
- **1** - Next iButton read successfully
- **0** - No more iButtons detected
- **-1** - Invalid iButton code (checksum failed)
- **-2** - Invalid iButton code (all zeros)
```

--------------------------------

### equalCode

Source: https://vdwulp.github.io/iButtonTag/REFERENCE.html

Tests if two iButtonCode’s are equal.

```APIDOC
## static bool equalCode(iButtonCode a, iButtonCode b)

### Description
Tests if two iButtonCode’s are equal.

### Parameters
- **a** (iButtonCode) - Required - First code to be tested.
- **b** (iButtonCode) - Required - Second code to be tested.

### Returns
- **true** - Codes are equal
- **false** - Codes are not equal
```

--------------------------------

### printCode

Source: https://vdwulp.github.io/iButtonTag/REFERENCE.html

Prints iButtonCode to Serial as hexadecimal byte values.

```APIDOC
## static void printCode(iButtonCode code, bool reverse)

### Description
Prints iButtonCode to Serial as hexadecimal byte values.

### Parameters
- **code** (iButtonCode) - Required - The code to be printed.
- **reverse** (bool) - Optional - Setting to true will reverse the printed code. Default is false.
```

--------------------------------

### testCode

Source: https://vdwulp.github.io/iButtonTag/REFERENCE.html

Tests an iButtonCode for validity.

```APIDOC
## static int8_t testCode(iButtonCode code)

### Description
Tests iButtonCode for validity.

### Parameters
- **code** (iButtonCode) - Required - Code to be tested.

### Returns
- **1** - iButton code valid
- **-1** - iButton code invalid (checksum failed)
- **-2** - iButton code invalid (all zeros)
```

--------------------------------

### updateChecksum

Source: https://vdwulp.github.io/iButtonTag/REFERENCE.html

Updates the checksum of an iButtonCode.

```APIDOC
## static void updateChecksum(iButtonCode code)

### Description
Updates checksum of iButtonCode to the correct value.

### Parameters
- **code** (iButtonCode) - Required - Code to be updated.
```

--------------------------------

### int8_t detectWritableType()

Source: https://vdwulp.github.io/iButtonTag/REFERENCE.html

Detects the type of a (re)writable iButton tag by performing multiple tests. Returns a constant indicating the model or an error code.

```APIDOC
## int8_t detectWritableType()

### Description
Detects the type of (re)writable iButton tag by checking for known responses. Returns a specific model constant if found.

### Returns
- **int8_t** - >0: iButton writable type found; 0: Unknown/not detectable; -1: No iButton detected.
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.