pxt-calliope/docs/projects/soil-moisture/connect.md
Peli de Halleux 676eee168a Soil - moisture (#418)
* updated servo calibrator

* updated plot analog pin example

* updated servo example

* first drop of soil moisture

* updated picture

* fixing macros

* update code section

* 5 seconds

* adding soil moisture

* fixing links
2017-06-21 11:17:25 -07:00

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1.4 KiB
Markdown

# Connect
We are going to use radio to send the current moisture
level to a dashboard @boardname@. The dashboard
will display one LED per @boardname@.
## Moisture sensor
To make it happen, we need to change the program to
* setup the radio by choosing group 4 and sending the serial number of the device
* send the moisture level **divided by 4**
as the dashboard takes values between ``0`` and ``255``.
```blocks
radio.setTransmitSerialNumber(true)
radio.setGroup(4)
led.setBrightness(64)
let reading = 0
basic.forever(() => {
pins.analogWritePin(AnalogPin.P1, 1023)
reading = pins.analogReadPin(AnalogPin.P0)
radio.sendNumber(reading / 4);
pins.analogWritePin(AnalogPin.P1, 0)
led.plotBarGraph(
reading,
1023
)
if (input.buttonIsPressed(Button.A)) {
basic.showNumber(reading)
}
basic.pause(5000);
})
```
## The dashboard
The dashboard code can be found at [/examples/radio-dashboard](/examples/radio-dashboard).
Download the code from that example into the @boardname@ that will be used to display the result.
When the dashboard receives a message from a @boardname@, it find a pixel for that board (and remembers it)
and uses the number received as the brightness of the LED.
When a message hasn't been received by a board for some time, it's pixel will start to blink. After more time, it will simply turn off.
```package
radio
```