go-nec
Implementation of IR transmition NEC protocol in golang
usage
package main
import (
"os"
"flag"
"github.com/stianeikeland/go-rpio"
"github.com/drahoslav7/go-nec"
)
var (
addr uint = 61184 // 24 key ir remote control
cmd uint = 3 // ON
)
func init() {
flag.UintVar(&cmd, "c", cmd, "command to send (0-23)")
flag.Parse()
}
func main() {
// init gpio
err := rpio.Open()
if err != nil {
os.Exit(1)
}
defer rpio.Close()
pin := rpio.Pin(2)
pin.Mode(rpio.Output)
pin.Write(rpio.Low)
// transmition funcion
toLED := func(v bool) {
if v {
pin.Write(rpio.High)
} else {
pin.Write(rpio.Low)
}
}
nec.EncodeExt(uint16(addr), uint8(cmd)).TransmitTimes(toLED, 3)
}
examples of NEC protocol
classic:
addr = 0
cmd = 1
data = addr + ^addr + cmd + ^cmd
=> 00 FF 80 7F
9 ms | 4.5 ms | addr | ^addr | cmd | ^cmd | end
1111111111111111 00000000 10 10 10 10 10 10 10 10 1000 1000 1000 1000 1000 1000 1000 1000 1000 10 10 10 10 10 10 10 10 1000 1000 1000 1000 1000 1000 1000 10000000...
0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1
nec.Encode(0, 1)
or nec.NewSignal(0x00FF807F)
extended:
addr = 61184
cmd = 3
data = low_addr + high_addr + cmd + ^cmd
=> 00 F7 C0 3F
9 ms | 4.5 ms | low addr | high addr | cmd | ^cmd | end
1111111111111111 00000000 10 10 10 10 10 10 10 10 1000 1000 1000 1000 10 1000 1000 1000 1000 1000 10 10 10 10 10 10 10 10 1000 1000 1000 1000 1000 1000 10000000...
0 0 0 0 0 0 0 0 1 1 1 1 0 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1
nec.EncodeExt(61184, 3)
or nec.NewSignal(0x00F7C03F)
repeat code:
9 ms |2.25|
1111111111111111 0000 1000...
nec.NewRepeatSignal()