49 lines
1.4 KiB
Markdown
49 lines
1.4 KiB
Markdown
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# Connect
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We are going to use radio to send the current moisture
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level to a dashboard @boardname@. The dashboard
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will display one LED per @boardname@.
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## Moisture sensor
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To make it happen, we need to change the program to
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* setup the radio by choosing group 4 and sending the serial number of the device
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* send the moisture level **divided by 4**
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as the dashboard takes values between ``0`` and ``255``.
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```blocks
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radio.setTransmitSerialNumber(true)
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radio.setGroup(4)
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led.setBrightness(64)
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let reading = 0
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basic.forever(() => {
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pins.analogWritePin(AnalogPin.P1, 1023)
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reading = pins.analogReadPin(AnalogPin.P0)
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radio.sendNumber(reading / 4);
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pins.analogWritePin(AnalogPin.P1, 0)
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led.plotBarGraph(
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reading,
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1023
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)
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if (input.buttonIsPressed(Button.A)) {
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basic.showNumber(reading)
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}
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basic.pause(5000);
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})
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```
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## The dashboard
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The dashboard code can be found at [/examples/radio-dashboard](/examples/radio-dashboard).
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Download the code from that example into the @boardname@ that will be used to display the result.
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When the dashboard receives a message from a @boardname@, it find a pixel for that board (and remembers it)
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and uses the number received as the brightness of the LED.
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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.
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```package
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radio
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```
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