Example #1
0
func main() {
	flag.Parse()

	if err := embd.InitGPIO(); err != nil {
		panic(err)
	}
	defer embd.CloseGPIO()

	pin, err := embd.NewDigitalPin(7)
	if err != nil {
		panic(err)
	}
	defer pin.Close()

	fluidSensor := watersensor.New(pin)

	for {
		wet, err := fluidSensor.IsWet()
		if err != nil {
			panic(err)
		}
		if wet {
			glog.Info("bot is dry")
		} else {
			glog.Info("bot is Wet")
		}

		time.Sleep(500 * time.Millisecond)
	}
}
Example #2
0
File: gpio.go Project: bgentry/embd
func main() {
	flag.Parse()

	if err := embd.InitGPIO(); err != nil {
		panic(err)
	}
	defer embd.CloseGPIO()

	led, err := embd.NewDigitalPin(10)
	if err != nil {
		panic(err)
	}
	defer led.Close()

	if err := led.SetDirection(embd.Out); err != nil {
		panic(err)
	}
	if err := led.Write(embd.High); err != nil {
		panic(err)
	}

	time.Sleep(1 * time.Second)

	if err := led.SetDirection(embd.In); err != nil {
		panic(err)
	}
}
Example #3
0
func main() {
	flag.Parse()

	if err := embd.InitGPIO(); err != nil {
		panic(err)
	}
	defer embd.CloseGPIO()

	btn, err := embd.NewDigitalPin(10)
	if err != nil {
		panic(err)
	}
	defer btn.Close()

	if err := btn.SetDirection(embd.In); err != nil {
		panic(err)
	}
	btn.ActiveLow(false)

	quit := make(chan interface{})
	err = btn.Watch(embd.EdgeFalling, func(btn embd.DigitalPin) {
		quit <- btn
	})
	if err != nil {
		panic(err)
	}

	fmt.Printf("Button %v was pressed.\n", <-quit)
}
Example #4
0
// NewGPIO creates a new HD44780 connected by a 4-bit GPIO bus.
func NewGPIO(
	rs, en, d4, d5, d6, d7, backlight interface{},
	blPolarity BacklightPolarity,
	rowAddr RowAddress,
	modes ...ModeSetter,
) (*HD44780, error) {
	pinKeys := []interface{}{rs, en, d4, d5, d6, d7, backlight}
	pins := [7]embd.DigitalPin{}
	for idx, key := range pinKeys {
		if key == nil {
			continue
		}
		var digitalPin embd.DigitalPin
		if pin, ok := key.(embd.DigitalPin); ok {
			digitalPin = pin
		} else {
			var err error
			digitalPin, err = embd.NewDigitalPin(key)
			if err != nil {
				glog.V(1).Infof("hd44780: error creating digital pin %+v: %s", key, err)
				return nil, err
			}
		}
		pins[idx] = digitalPin
	}
	for _, pin := range pins {
		if pin == nil {
			continue
		}
		err := pin.SetDirection(embd.Out)
		if err != nil {
			glog.Errorf("hd44780: error setting pin %+v to out direction: %s", pin, err)
			return nil, err
		}
	}
	return New(
		NewGPIOConnection(
			pins[0],
			pins[1],
			pins[2],
			pins[3],
			pins[4],
			pins[5],
			pins[6],
			blPolarity),
		rowAddr,
		modes...,
	)
}
Example #5
0
func main() {
	flag.Parse()

	h, _, err := embd.DetectHost()
	if err != nil {
		return
	}

	var pinNo interface{}

	switch h {
	case embd.HostBBB:
		pinNo = "P9_31"
	case embd.HostRPi:
		pinNo = 10
	default:
		panic("host not supported (yet :P)")
	}

	if err := embd.InitGPIO(); err != nil {
		panic(err)
	}
	defer embd.CloseGPIO()

	led, err := embd.NewDigitalPin(pinNo)
	if err != nil {
		panic(err)
	}
	defer led.Close()

	if err := led.SetDirection(embd.Out); err != nil {
		panic(err)
	}
	if err := led.Write(embd.High); err != nil {
		panic(err)
	}

	time.Sleep(1 * time.Second)

	if err := led.SetDirection(embd.In); err != nil {
		panic(err)
	}
}
Example #6
0
func main() {
	stepDelay := flag.Int("step-delay", 10, "milliseconds between steps")
	flag.Parse()

	if err := embd.InitGPIO(); err != nil {
		panic(err)
	}
	defer embd.CloseGPIO()

	// Physical pins 11,15,16,18 on rasp pi
	// GPIO17,GPIO22,GPIO23,GPIO24
	stepPinNums := []int{17, 22, 23, 24}

	stepPins := make([]embd.DigitalPin, 4)

	for i, pinNum := range stepPinNums {
		pin, err := embd.NewDigitalPin(pinNum)
		if err != nil {
			panic(err)
		}
		defer pin.Close()
		if err := pin.SetDirection(embd.Out); err != nil {
			panic(err)
		}
		if err := pin.Write(embd.Low); err != nil {
			panic(err)
		}
		defer pin.SetDirection(embd.In)

		stepPins[i] = pin
	}

	// Define sequence described in manufacturer's datasheet
	seq := [][]int{
		[]int{1, 0, 0, 0},
		[]int{1, 1, 0, 0},
		[]int{0, 1, 0, 0},
		[]int{0, 1, 1, 0},
		[]int{0, 0, 1, 0},
		[]int{0, 0, 1, 1},
		[]int{0, 0, 0, 1},
		[]int{1, 0, 0, 1},
	}
	stepCount := len(seq) - 1
	stepDir := 2 // Set to 1 or 2 for clockwise, -1 or -2 for counter-clockwise

	quit := make(chan os.Signal, 1)
	signal.Notify(quit, os.Interrupt, os.Kill)
	defer signal.Stop(quit)

	// Start main loop
	ticker := time.NewTicker(time.Duration(*stepDelay) * time.Millisecond)
	defer ticker.Stop()

	var stepCounter int
	for {
		select {
		case <-ticker.C:
			// set pins to appropriate values for given position in the sequence
			for i, pin := range stepPins {
				if seq[stepCounter][i] != 0 {
					fmt.Printf("Enable pin %d, step %d\n", i, stepCounter)
					if err := pin.Write(embd.High); err != nil {
						panic(err)
					}
				} else {
					if err := pin.Write(embd.Low); err != nil {
						panic(err)
					}
				}
			}
			stepCounter += stepDir

			// If we reach the end of the sequence start again
			if stepCounter >= stepCount {
				stepCounter = 0
			} else if stepCounter < 0 {
				stepCounter = stepCount
			}

		case <-quit:
			return
		}
	}
}