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## Wire.onReceive(handler)

#### Description

Registers a function to be called when a slave device receives a transmission from a master.

#### Parameters

handler: the function to be called when the slave receives data; this should take a single int parameter (the number of bytes received from the master) and return nothing, e.g.: `void myHandler(int numBytes)`

#### Returns

None

#### See Also

- Wire.onRequest()

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