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<pre style="background-color: #ACC8E5; color: #112A46; border-radius: 10px; padding: 10px;">Is used to invoke a macro when a particular NFC tag is scanned. An NFC tag should be first written by MacroDroid with a specific identifier and then this identifier can be used to trigger specific instances of the NFC trigger.
<pre class="header-style">The NFC Tag trigger fires when a specific NFC tag is scanned. Users must first write an identifier to an NFC tag using MacroDroid, then use that identifier to activate corresponding macros. This provides a simple way to trigger automation by tapping your device on an NFC tag.</pre>
''' Options '''
* '''Write New Tag''' - Write a new identifier to an NFC tag. You will be prompted to enter a name for the tag, then scan the tag to write the MacroDroid identifier to it.
* '''Use Existing Tag''' - Scan an existing MacroDroid-configured NFC tag to use its identifier for this trigger.
''' Tag Name '''
When writing a new tag, you must specify a name (up to 25 characters) that will identify the tag. This name is used to link the tag to the trigger configuration.
''' Examples '''
''Example 1: Toggle bedroom lights when scanning NFC tag on nightstand''
<pre class="trigger-style">Triggers
NFC Tag: Bedroom Lights</pre>
<pre class="action-style">Actions
HTTP Request: Toggle Smart Light API
Speak Text: Lights toggled</pre>
''Example 2: Clock in at work when scanning desk NFC tag''
<pre class="trigger-style">Triggers
NFC Tag: Work Desk</pre>
<pre class="action-style">Actions
Set Variable: work_start = {hour}:{minute}
Send SMS: Work arrival logged at {hour}:{minute}</pre>
<pre class="constraint-style">Constraints
Day of Week: Monday, Tuesday, Wednesday, Thursday, Friday</pre>
''' Limitations '''
* Only writeable NDEF-compatible tags can be used with MacroDroid
* The system cannot use existing NFC tags like access cards or transit passes because:
** These tags are typically read-only or protected
** There is no method to prevent other NFC applications from activating simultaneously when these tags are scanned
** Using pre-existing tags would require users to manually select an app with each scan
* When writing to a tag, any existing data on the tag will be erased and replaced with the MacroDroid identifier
''' Notes '''
* NFC must be enabled on your device for this trigger to work
* The trigger uses a URL format (macrodroid://tag/[tagname]) written to the NFC tag
* This trigger only appears on devices that have NFC hardware
* The trigger fires when the device is tapped on the NFC tag, even when MacroDroid is not in the foreground
* NFC tags are inexpensive and can be purchased online or at electronics stores
''' See Also '''
* [[Trigger: NFC State Change]]
* [[Action: Enable/Disable NFC]]