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main.go
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main.go
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package main
import (
"machine"
"time"
"github.com/PacktPublishing/Programming-Microcontrollers-and-WebAssembly-with-TinyGo/Chapter04/buzzer"
"github.com/PacktPublishing/Programming-Microcontrollers-and-WebAssembly-with-TinyGo/Chapter05/hs42561k"
"github.com/PacktPublishing/Programming-Microcontrollers-and-WebAssembly-with-TinyGo/Chapter05/max7219spi"
hcsr04 "github.com/PacktPublishing/Programming-Microcontrollers-and-WebAssembly-with-TinyGo/Chapter05/ultrasonic-distance-sensor"
)
func main() {
err := machine.SPI0.Configure(machine.SPIConfig{
SDO: machine.D11,
SCK: machine.D13,
LSBFirst: false,
Frequency: 10000000,
})
if err != nil {
println("failed to configure spi:", err.Error())
}
println("spi configured")
displayDriver := max7219spi.NewDevice(machine.D6, machine.SPI0)
displayDriver.Configure()
display := hs42561k.NewDevice(displayDriver, 4)
display.Configure()
distanceSensor := hcsr04.NewDevice(machine.D2, machine.D3, 60)
distanceSensor.Configure()
buzzer := buzzer.NewBuzzer(machine.D5)
buzzer.Configure()
println("all devices configured")
for {
currentDistance := distanceSensor.GetDistance()
println("current distance:", currentDistance)
if currentDistance >= 12 && currentDistance <= 25 {
println("timer activated")
handleTimer(display, displayDriver, buzzer)
}
time.Sleep(100 * time.Millisecond)
}
}
func handleTimer(display hs42561k.Device, displayDriver max7219spi.Device, buzzer buzzer.Buzzer) {
display.Configure()
buzzer.Beep(100*time.Millisecond, 2)
for i := 120; i > 0; i-- {
println("counting:", i)
if i >= 100 {
display.SetDigit(2, hs42561k.Character(i/100))
} else {
display.SetDigit(2, hs42561k.Blank)
}
if i >= 10 {
display.SetDigit(3, hs42561k.Character(i/10))
if i%10 == 0 {
display.SetDigit(4, hs42561k.Character(0))
} else {
display.SetDigit(4, hs42561k.Character(i-10))
}
} else {
display.SetDigit(3, hs42561k.Blank)
display.SetDigit(4, hs42561k.Character(i))
}
time.Sleep(time.Second)
}
display.SetDigit(3, hs42561k.Blank)
display.SetDigit(4, hs42561k.Blank)
buzzer.Beep(500*time.Millisecond, 1)
displayDriver.StartShutdownMode()
}