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updated fireflies lesson

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Peli de Halleux 2017-06-04 22:34:28 -07:00
parent 59c5e2ea9a
commit 5a80adeb8d
1 changed files with 29 additions and 6 deletions
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35
docs/projects/fireflies.md
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@ -40,8 +40,8 @@ basic.forever(() => {
if (clock >= 8) { if (clock >= 8) {
// flash // flash
game.addScore(1) game.addScore(1)
// wait for 2 ticks + a tiny bit // wait for 2 ticks
basic.pause(220) basic.pause(200)
// reset the clock // reset the clock
clock = 0 clock = 0
} else { } else {
@ -58,6 +58,30 @@ basic.forever(() => {
We will use radio messages to simulate the vision of fireflies. We will use radio messages to simulate the vision of fireflies.
* When a firefly flashes, it also sends a number over radio using [radio send number](/reference/radio/send-number). * When a firefly flashes, it also sends a number over radio using [radio send number](/reference/radio/send-number).
```block
// the clock ticker
let clock = 0
basic.forever(() => {
// if clock "hits noon", flash the screen
if (clock >= 8) {
// notify neighbors
radio.sendNumber(0)
// flash
game.addScore(1)
// wait for 2 ticks
basic.pause(200)
// reset the clock
clock = 0
} else {
// just wait a bit
basic.pause(100)
// increment the clock
clock += 1
}
})
```
* When a firefly receives a radio packet, it increments its clock by one just like the fireflies. * When a firefly receives a radio packet, it increments its clock by one just like the fireflies.
```block ```block
@ -89,11 +113,11 @@ basic.forever(() => {
// if clock hits noon, flash the screen // if clock hits noon, flash the screen
if (clock >= 8) { if (clock >= 8) {
// notify neighbors // notify neighbors
radio.sendNumber(clock) radio.sendNumber(0)
// flash // flash
game.addScore(1) game.addScore(1)
// wait for 2 ticks + a tiny bit // wait for 2 ticks
basic.pause(220) basic.pause(200)
// reset the clock // reset the clock
clock = 0 clock = 0
} else { } else {
@ -103,7 +127,6 @@ basic.forever(() => {
clock += 1 clock += 1
} }
}) })
// short range radio transmission
radio.setTransmitPower(1) radio.setTransmitPower(1)
radio.setGroup(12) radio.setGroup(12)
``` ```