pxt-calliope/docs/reference/radio/send-string.md
2017-03-16 07:57:41 -07:00

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# Send String
Sends a string to other @boardname@s in the area connected by radio. The
maximum string length is 19 characters.
```sig
radio.sendString("Hello!")
```
### Parameters
* `msg` is a [string](/types/string) to send by radio.
### Example: Two-way radio
If you load this program onto two or more @boardname@s, you can send a
code word from one of them to the others by pressing button `A`. The
other @boardname@s will receive the code word and then show it.
```blocks
input.onButtonPressed(Button.A, () => {
radio.sendString("Codeword: TRIMARAN")
basic.showString("SENT");
})
radio.onDataPacketReceived(({ receivedString }) => {
basic.showString(receivedString);
});
```
### ~hint
A radio that can both transmit and receive is called a _transceiver_.
### ~
### See also
[on data packet received](/reference/radio/on-data-packet-received)
```package
radio
```