55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
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package main
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import (
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"image/color"
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"machine"
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"time"
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"tinygo.org/x/drivers/encoders"
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"tinygo.org/x/drivers/ws2812"
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)
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func main() {
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// WS2812 LEDs are on pin P1_11
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neo := machine.P1_11
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neo.Configure(machine.PinConfig{Mode: machine.PinOutput})
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leds := ws2812.New(neo)
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ledColors := make([]color.RGBA, 2)
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// rotary encoder: A=P1_00, B=P0_24; push button=P0_22
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enc := encoders.NewQuadratureViaInterrupt(machine.P1_00, machine.P0_24)
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enc.Configure(encoders.QuadratureConfig{Precision: 4})
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btnRot := machine.P0_22
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btnRot.Configure(machine.PinConfig{Mode: machine.PinInputPullup})
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var k uint8
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for {
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// pressing the rotary button resets position to zero
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if !btnRot.Get() {
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enc.SetPosition(0)
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}
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// encoder position cycles through the rainbow
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k = uint8(enc.Position())
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ledColors[0] = getRainbowRGB(k)
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ledColors[1] = getRainbowRGB(k + 85)
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leds.WriteColors(ledColors)
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time.Sleep(20 * time.Millisecond)
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}
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}
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func getRainbowRGB(i uint8) color.RGBA {
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if i < 85 {
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return color.RGBA{i * 3, 255 - i*3, 0, 255}
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} else if i < 170 {
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i -= 85
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return color.RGBA{255 - i*3, 0, i * 3, 255}
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}
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i -= 170
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return color.RGBA{0, i * 3, 255 - i*3, 255}
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}
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