50 lines
1001 B
Go
50 lines
1001 B
Go
// Copyright 2016 yryz Author. All Rights Reserved.
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package ds18b20
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import (
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"errors"
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"io/ioutil"
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"strconv"
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"strings"
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)
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var ErrReadSensor = errors.New("failed to read sensor temperature")
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// Sensors get all connected sensor IDs as array
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func Sensors() ([]string, error) {
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data, err := ioutil.ReadFile("/sys/bus/w1/devices/w1_bus_master1/w1_master_slaves")
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if err != nil {
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return nil, err
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}
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sensors := strings.Split(string(data), "\n")
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if len(sensors) > 0 {
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sensors = sensors[:len(sensors)-1]
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}
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return sensors, nil
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}
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// Temperature get the temperature of a given sensor
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func Temperature(sensor string) (float64, error) {
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data, err := ioutil.ReadFile("/sys/bus/w1/devices/" + sensor + "/w1_slave")
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if err != nil {
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return 0.0, ErrReadSensor
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}
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raw := string(data)
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i := strings.LastIndex(raw, "t=")
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if i == -1 {
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return 0.0, ErrReadSensor
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}
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c, err := strconv.ParseFloat(raw[i+2:len(raw)-1], 64)
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if err != nil {
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return 0.0, ErrReadSensor
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}
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return c / 1000.0, nil
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}
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