86 lines
2.2 KiB
Markdown
86 lines
2.2 KiB
Markdown
# Voting Machine
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## ~ avatar
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Build a voting machine using many @boardname@s!
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## ~
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https://youtu.be/77HOqf8BaNg
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In this project, a **voter** program is loaded onto a player's @boardname@. The player uses the buttons to vote either``yes`` or ``no``
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and the vote is sent to a **dashboard** @boardname@ using the radio.
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The dashboard allocates one LED per player and turns it on or off based on the vote.
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## The voter program
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Assuming button ``A`` is for a NO vote and ``B`` is for YES, the voter program works like this:
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### Transmit a NO vote
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When button ``A`` is pressed, a number ``0`` is sent via radio and the ``X`` symbol is shown on the screen.
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```block
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input.onButtonPressed(Button.A, () => {
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radio.sendNumber(0)
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basic.showIcon(IconNames.No)
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})
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```
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### Transmit a YES vote
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When button ``B`` is pressed, a number ``255`` is sent via radio and the ``Y`` symbol is shown on the screen.
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```block
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input.onButtonPressed(Button.B, () => {
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radio.sendNumber(255)
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basic.showIcon(IconNames.Yes)
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})
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```
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### Set device serial number
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In order to track the votes, we tell the radio to also transmit the device serial number.
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```block
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radio.setTransmitSerialNumber(true)
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```
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### Set the radio group
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We arbitrarily choose ``4`` as the group used for the communications.
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```block
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radio.setGroup(4)
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```
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Combined together, the final voter program is this:
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```blocks
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input.onButtonPressed(Button.A, () => {
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radio.sendNumber(0)
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basic.showIcon(IconNames.No)
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})
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input.onButtonPressed(Button.B, () => {
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radio.sendNumber(255)
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basic.showIcon(IconNames.Yes)
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})
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radio.setGroup(4)
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radio.setTransmitSerialNumber(true)
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basic.showIcon(IconNames.Ghost)
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```
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## The dashboard
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The dashboard code is in the [radio dashboard](/examples/radio-dashboard) example.
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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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