# RC Module | Since | Origin / Contributor | Maintainer | Source | | :----- | :-------------------- | :---------- | :------ | | 2015-06-12 | [Mike Wen](https://github.com/mikewen) | - | [rc.c](../../app/modules/rc.c)| Module to generate series of impulses for remote control via 433/315Mhz radio transmitter. Superseded by **[rfswitch](./rfswitch.md)** module which have same functionality, and supports more transmission protocols. For more detailed description see [rfswitch module documentation](./rfswitch.md). ## rc.send() Sends series of impulses #### Syntax `rc.send(pin, value, length, pulse_length, protocol_id, repeat)` which is similar to: `rfswitch.send(protocol_id, pulse_length, repeat, pin, value, length)` #### Parameters - `pin` 0~12, I/O index of pin, example 6 is for GPIO12, see [details](../modules/gpio/) - `value` positive integer value, this is the primary data which will be sent - `length` bit length of value, if value length is 3 bytes, then length is 24 - `pulse_length` length of one pulse in microseconds, usually from 100 to 650 - `protocol_id` positive integer value, from 1-3 - `repeat` repeat value, usually from 1 to 5. This is a synchronous task. Setting the repeat count to a large value will cause problems. The recommended limit is about 1-4. #### Returns `1` always 1 #### Example ```lua -- Lua transmit radio code using protocol #1 -- pulse_length 300 microseconds -- repeat 5 times -- use pin #7 (GPIO13) -- value to send is 560777 -- value length is 24 bits (3 bytes) rc.send(7, 560777, 24, 300, 1, 5) ``` which is similar to: ```lua rfswitch.send(1, 300, 5, 7, 560777, 24) ```