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rasp-fan.go
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rasp-fan.go
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package main
import (
"./cmd/config"
"./cmd/fan"
"./cmd/temp"
"flag"
"fmt"
"log"
"os/exec"
"time"
)
var cfg config.Config;
const (
DefaultShutdownTemp = 70
DefaultGPIOPin = 18
DefaultRunFanTemp = 50
DefaultStopFanTemp = 36
DefaultWatchMs = 1000
)
func init() {
configFilePointer := flag.String("config", "", "Path to config.json file")
flag.Parse()
var err error;
cfg, err = config.ReadConfig(*configFilePointer)
if err != nil {
fmt.Println(err)
}
if cfg.GPIOPin == 0 {
cfg.GPIOPin = DefaultGPIOPin
}
if cfg.RunFanTemp == 0 {
cfg.RunFanTemp = DefaultRunFanTemp
}
if cfg.StopFanTemp == 0 {
cfg.StopFanTemp = DefaultStopFanTemp
}
if cfg.ShutdownTemp == 0 {
cfg.ShutdownTemp = DefaultShutdownTemp
}
if cfg.WatchMs == 0 {
cfg.WatchMs = DefaultWatchMs
}
fmt.Println(cfg);
}
func shutdownNow() {
output, err := exec.Command("shutdown", "now").Output()
if err != nil {
log.Println(err)
}
fmt.Println(string(output))
}
func main() {
fanManager, err := fan.CreateFanManager(cfg.GPIOPin, cfg.RunFanTemp, cfg.StopFanTemp)
if err != nil {
log.Fatal(err);
}
defer fanManager.Close()
for {
t, err := temp.GetTemperature()
if t >= cfg.ShutdownTemp {
shutdownNow();
}
if err != nil || t == 0 {
// Can't get temp
fanManager.RunFan()
time.Sleep(time.Duration(cfg.WatchMs) * time.Millisecond)
continue
}
err = fanManager.ProcessTemp(t)
if err != nil {
// Can't process temp
fanManager.RunFan();
time.Sleep(time.Duration(cfg.WatchMs) * time.Millisecond)
continue
}
time.Sleep(time.Duration(cfg.WatchMs) * time.Millisecond)
}
}