55 lines
1.8 KiB
Markdown
55 lines
1.8 KiB
Markdown
# write Value
|
|
|
|
Write a **name:value** pair and a newline character (`\r\n`) to the [serial](/device/serial) port.
|
|
|
|
```sig
|
|
serial.writeValue("x", 0);
|
|
```
|
|
|
|
It is common when reporting or recording data to use a _Name Value Pair_ (NVP). They appear as a text output string in the form of a _name_ and a _value_ together. The name and the value are separated in the string with a _colon_, `:`. A name value pair reporting a temperature of `-15` degrees could look like:
|
|
|
|
``temperature:-15``
|
|
|
|
Associating a name with a value helps to identify related data when different data sources are recorded. For example, if you're reporting both temperature and light intensity, the _name:value_ format helps spreadsheets or other data analysis programs distinguish between them and group the same types of values together properly. Reporting two data sources might look like this in the output:
|
|
|
|
```
|
|
temperature:-15
|
|
temperature:-12
|
|
light:154
|
|
temperature:-11
|
|
light:152
|
|
```
|
|
|
|
## Parameters
|
|
|
|
* `name` is the [string](/types/string) to write to the serial port
|
|
* `value` is the [number](/types/number) to write to the serial port
|
|
|
|
## Example: streaming data
|
|
|
|
Every 10 seconds, the example below sends the temperature and light level
|
|
to the serial port.
|
|
|
|
```blocks
|
|
basic.forever(() => {
|
|
serial.writeValue("temp", input.temperature())
|
|
serial.writeValue("light", input.lightLevel())
|
|
basic.pause(10000);
|
|
})
|
|
```
|
|
|
|
### ~hint
|
|
|
|
The [send value](/reference/radio/send-value) function broadcasts
|
|
string/number pairs. You can use a second @boardname@ to receive them,
|
|
and then send them directly to the serial port with ``write value``.
|
|
|
|
### ~
|
|
|
|
## See also
|
|
|
|
[serial](/device/serial),
|
|
[serial write line](/reference/serial/write-line),
|
|
[serial write number](/reference/serial/write-number),
|
|
[send value](/reference/radio/send-value)
|