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Add more flags to ina219 example

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// Adapted from https://github.com/periph/cmd/blob/main/ina219/main.go
//
// Copyright 2018 The Periph Authors. All rights reserved.
// Use of this source code is governed under the Apache License, Version 2.0
// that can be found in the LICENSE file.
package main
import (
"flag"
"fmt"
"os"
"os/signal"
"regexp"
"strconv"
"syscall"
"time"
"periph.io/x/conn/v3/i2c/i2creg"
"periph.io/x/conn/v3/physic"
"periph.io/x/devices/v3/ina219"
"periph.io/x/host/v3"
)
func mainImpl() error {
if _, err := host.Init(); err != nil {
return err
}
address := flag.Int("address", 0x45, "I²C address")
i2cbus := flag.String("bus", "", "I²C bus (/dev/i2c-1)")
senseResistor := flag.String("sense-resistor", "10m", "Resistance of the shunt resistor in ohms (optionally with suffix m = milli, {µ,mu} = micro, n = nano)")
maxCurrent := flag.String("max-current", "8", "Maximum current through the device in amps (optional suffix as for --sense-resistor)")
flag.Parse()
resistor, err := parseNanoSI[physic.ElectricResistance](*senseResistor)
if err != nil {
return fmt.Errorf("parsing --sense-resistor: %w", err)
}
current, err := parseNanoSI[physic.ElectricCurrent](*maxCurrent)
if err != nil {
return fmt.Errorf("parsing --max-current: %w", err)
}
if _, err := host.Init(); err != nil {
return err
}
// Open default I²C bus.
bus, err := i2creg.Open(*i2cbus)
if err != nil {
return fmt.Errorf("failed to open I²C: %v", err)
}
defer bus.Close()
sensor, err := ina219.New(bus, &ina219.Opts{
Address: *address,
SenseResistor: resistor,
MaxCurrent: current,
})
if err != nil {
return fmt.Errorf("failed to open new sensor: %v", err)
}
// Read values from sensor every second.
everySecond := time.NewTicker(time.Second).C
var halt = make(chan os.Signal, 1)
signal.Notify(halt, syscall.SIGTERM)
signal.Notify(halt, syscall.SIGINT)
fmt.Println("ctrl+c to exit")
for {
select {
case <-everySecond:
p, err := sensor.Sense()
if err != nil {
return fmt.Errorf("sensor reading error: %v", err)
}
fmt.Println(p)
case <-halt:
return nil
}
}
}
func main() {
if err := mainImpl(); err != nil {
fmt.Fprintf(os.Stderr, "ina219: %s.\n", err)
return
}
}
var siSmallRE = regexp.MustCompile(`^(\d+)(m|mu|µ|n)?$`)
func parseNanoSI[U ~int64](s string) (U, error) {
submatches := siSmallRE.FindStringSubmatch(s)
if len(submatches) < 2 {
return 0, fmt.Errorf("value %q did not match %q", s, siSmallRE)
}
valueInt, err := strconv.Atoi(submatches[1])
if err != nil {
return 0, err
}
value := U(valueInt)
switch len(submatches) {
case 2:
value *= 1_000_000_000
case 3:
switch submatches[2] {
case "m":
value *= 1_000_000
case "mu", "µ":
value *= 1_000
case "n":
value *= 1
default:
}
}
return value, nil
}

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module gitea.drjosh.dev/josh/ina219-exporter
go 1.23.1
require (
github.com/dustin/go-humanize v1.0.1
periph.io/x/conn/v3 v3.7.1
periph.io/x/devices/v3 v3.7.1
periph.io/x/host/v3 v3.8.2
)

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github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
github.com/jonboulle/clockwork v0.4.0 h1:p4Cf1aMWXnXAUh8lVfewRBx1zaTSYKrKMF2g3ST4RZ4=
github.com/jonboulle/clockwork v0.4.0/go.mod h1:xgRqUGwRcjKCO1vbZUEtSLrqKoPSsUpK7fnezOII0kc=
periph.io/x/conn/v3 v3.7.1 h1:tMjNv3WO8jEz/ePuXl7y++2zYi8LsQ5otbmqGKy3Myg=
periph.io/x/conn/v3 v3.7.1/go.mod h1:c+HCVjkzbf09XzcqZu/t+U8Ss/2QuJj0jgRF6Nye838=
periph.io/x/devices/v3 v3.7.1 h1:BsExlfYJlZUZoawzpMF7ksgC9f1eBAdqvKRCGvb+VYw=
periph.io/x/devices/v3 v3.7.1/go.mod h1:ezQOe8WknDaMbKZXVwQUQkIauyLyJshwAHkIohHXA94=
periph.io/x/host/v3 v3.8.2 h1:ayKUDzgUCN0g8+/xM9GTkWaOBhSLVcVHGTfjAOi8OsQ=
periph.io/x/host/v3 v3.8.2/go.mod h1:yFL76AesNHR68PboofSWYaQTKmvPXsQH2Apvp/ls/K4=