ev3

README

ev3 provides EV3-specific functions for the Go ev3dev interface

github.com/ev3go/ev3dev depends on ev3dev stretch. For jessie support see the ev3dev-jessie branch.

Example code

package main

import (
	"log"
	"time"

	"github.com/ev3go/ev3"
)

func main() {
	var bright byte
	var err error
	for i := 0; i < 10; i++ {
		err = ev3.GreenLeft.SetBrightness(int(bright)).Err()
		if err != nil {
			log.Fatal(err)
		}
		time.Sleep(time.Second)

		bright = ^bright

		err = ev3.GreenRight.SetBrightness(int(bright)).Err()
		if err != nil {
			log.Fatal(err)
		}
		time.Sleep(time.Second)
	}
}

LEGO® is a trademark of the LEGO Group of companies which does not sponsor, authorize or endorse this software.

Documentation

Overview

Package ev3 provides ev3-specific and higher level access to the ev3dev control and sensor drivers.

Index

• Constants
• Variables

Constants

const (
	// LCDWidth is the width of the LCD screen in pixels.
	LCDWidth = 178

	// LCDHeight is the height of the LCD screen in pixels.
	LCDHeight = 128

	// LCDStride is the width of the LCD screen memory in bytes.
	LCDStride = 712
)

Variables

var (
	GreenLeft  = &ev3dev.LED{Name: led{color: "green", side: "left"}}
	GreenRight = &ev3dev.LED{Name: led{color: "green", side: "right"}}
	RedLeft    = &ev3dev.LED{Name: led{color: "red", side: "left"}}
	RedRight   = &ev3dev.LED{Name: led{color: "red", side: "right"}}
)

LED handles for ev3 devices.

var LCD = ev3dev.NewFrameBuffer("/dev/fb0", fb.NewXRGBWith, LCDWidth, LCDHeight, LCDStride)

LCD is the draw image used draw directly to the ev3 LCD screen. Drawing operations are safe for concurrent use, but are not atomic beyond the pixel level. It must be initialized before use.

var Speaker = ev3dev.NewSpeaker("/dev/input/by-path/platform-snd-legoev3-event")

Speaker is a handle to the ev3 speaker. It must be initialized before use.