gobot.io/x/gobot/v2@v2.1.0/examples/nanopi_direct_pin.go (about)

     1  //go:build example
     2  // +build example
     3  
     4  //
     5  // Do not build by default.
     6  
     7  package main
     8  
     9  import (
    10  	"fmt"
    11  	"time"
    12  
    13  	"gobot.io/x/gobot/v2"
    14  	"gobot.io/x/gobot/v2/drivers/gpio"
    15  	"gobot.io/x/gobot/v2/platforms/adaptors"
    16  	"gobot.io/x/gobot/v2/platforms/nanopi"
    17  )
    18  
    19  // Wiring
    20  // PWR  NanoPi: 1, 17 (+3.3V, VCC); 2, 4 (+5V, VDD); 6, 9, 14, 20 (GND)
    21  // GPIO NanoPi: header pin 22 is input, pin 23 is normal output, pin 24 is inverted output
    22  // Button: the input pin is wired with a button to GND, the internal pull up resistor is used
    23  // LED's: the output pins are wired to the cathode of a LED, the anode is wired with a resistor (70-130Ohm for 20mA) to VCC
    24  // Expected behavior: always one LED is on, the other in opposite state, if button is pressed for >2 seconds the state changes
    25  func main() {
    26  	const (
    27  		inPinNum          = "22" // 7, 8, 10, 11, 12, 13, 15, 16, 18, 22
    28  		outPinNum         = "23"
    29  		outPinInvertedNum = "24"
    30  		debounceTime      = 2 * time.Second
    31  	)
    32  	// note: WithGpiosOpenDrain() is optional, if using WithGpiosOpenSource() the LED's will not light up
    33  	board := nanopi.NewNeoAdaptor(adaptors.WithGpiosActiveLow(outPinInvertedNum),
    34  		adaptors.WithGpiosOpenDrain(outPinNum, outPinInvertedNum),
    35  		adaptors.WithGpiosPullUp(inPinNum),
    36  		adaptors.WithGpioDebounce(inPinNum, debounceTime))
    37  
    38  	inPin := gpio.NewDirectPinDriver(board, inPinNum)
    39  	outPin := gpio.NewDirectPinDriver(board, outPinNum)
    40  	outPinInverted := gpio.NewDirectPinDriver(board, outPinInvertedNum)
    41  
    42  	work := func() {
    43  		level := byte(1)
    44  
    45  		gobot.Every(500*time.Millisecond, func() {
    46  			read, err := inPin.DigitalRead()
    47  			fmt.Printf("pin %s state is %d\n", inPinNum, read)
    48  			if err != nil {
    49  				fmt.Println(err)
    50  			} else {
    51  				level = byte(read)
    52  			}
    53  
    54  			err = outPin.DigitalWrite(level)
    55  			fmt.Printf("pin %s is now %d\n", outPinNum, level)
    56  			if err != nil {
    57  				fmt.Println(err)
    58  			}
    59  
    60  			err = outPinInverted.DigitalWrite(level)
    61  			fmt.Printf("pin %s is now not %d\n", outPinInvertedNum, level)
    62  			if err != nil {
    63  				fmt.Println(err)
    64  			}
    65  
    66  			if level == 1 {
    67  				level = 0
    68  			} else {
    69  				level = 1
    70  			}
    71  		})
    72  	}
    73  
    74  	robot := gobot.NewRobot("pinBot",
    75  		[]gobot.Connection{board},
    76  		[]gobot.Device{inPin, outPin, outPinInverted},
    77  		work,
    78  	)
    79  
    80  	robot.Start()
    81  }