Initial import

This commit is contained in:
Søren Rasmussen 2021-08-10 23:29:24 +02:00
commit 74bf90d7c0
9 changed files with 574 additions and 0 deletions

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root = true
[*]
indent_style = tab
indent_size = 4
end-of_line = lf
charset = utf-8
trim_trailing_whitespace = true
insert_final_newline = true
[*.md]
trim_trailing_whitespace = false
[*.{conf,hcl,json,xml,yml}]
indent_style = space
indent_size = 2

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/vendor/

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# fermentord
Control the temperature of your fermentation process.
# Epics
## Heater/Cooler
| Persona | Description |
|----------|--------------------------------------------------------------------------------|
| Brewer | The person responsible for the wort and the fermentation process |
| Operator | The person responsible for the fermentation tank and the system controlling it |
*As a brewer I need to maintain the wort at a specific temperature so that my fermentation process is predictable*
*As an operator I need an alert if the system can't maintain the temperature, so that I may correct the problem*
## Ambient temperature
* Ambient temperature
* Case temperature
* Wort temperature
* Wort gravity
# User stories
## Acceptance criteria
* Given the wort is at or above the requested temperature and the heater is running then stop the heater
* Given the wort is above the requested temperature and the heater is not running then start the cooler
* Given the wort is above the requested temperature
* Given the wort is too cold and the cooler is running then stop the cooler
* Given the wort is too cold and the cooler is not running then start the heater
* Given the cooler is running
* Given the cooler is running when then the heater may not start
* Given the heater is running then the cooler may not start
* Given the temperature is
# Data logging
* Ambient temperature
* Case temperature
* Wort temperature
* Wort gravity
* Data is stored in sqlite3
* Data is scraped and stored in PostgreSQL
* Data is removed from sqlite3 when confirmed in PostgreSQL
# Metrics
Prometheus metrics
* Ambient temperature
* Case temperature
* Wort temperature
* Wort gravity
* Heater state
* Cooler state

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package main
import (
"git.joco.dk/sng/fermentord/internal/dal"
"git.joco.dk/sng/fermentord/internal/hw"
"git.joco.dk/sng/fermentord/pkg/onewire"
"github.com/rs/zerolog/log"
"github.com/spf13/viper"
)
type configuration struct {
Db struct {
Dsn string `mapstructure:"dsn"`
} `mapstructure:"db"`
Temperature struct {
WortSensor string `mapstructure:"wort_sensor"`
FridgeSensor string `mapstructure:"fridge_sensor"`
AmbientSensor string `mapstructure:"ambient_sensor"`
} `mapstructure:"temperature"`
}
var (
config configuration
)
func main() {
// Configuration
viper.SetEnvPrefix("FERMENTORD")
viper.AutomaticEnv()
viper.SetDefault("db.dsn", "./fermentord.db")
viper.AddConfigPath("/etc")
viper.SetConfigName("fermentord")
viper.SetConfigType("hcl")
viper.Unmarshal(&config)
// Database
log.Info().Str("dsn", config.Db.Dsn).Msg("Initializing DB")
if dal, err := dal.NewDAL(config.Db.Dsn); err != nil {
log.Fatal().Err(err).Msg("Error initializing DB")
} else {
dal.Initialize()
defer dal.Close()
}
// GPIO
log.Info().Msg("Initializing GPIO")
if gpio, err := hw.NewGpio(); err != nil {
log.Fatal().Err(err).Send()
} else {
defer gpio.Close()
}
// TODO Temperature sensors
sensors, err := onewire.Sensors()
if err != nil {
log.Fatal().Err(err).Msg("Error initializing 1-wire sensors")
}
for _, sensor := range sensors {
t, err := onewire.Temperature(sensor)
}
// TODO Temperature sensor calculation to trigger cooler/heater
// TODO Read values from
}

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module git.joco.dk/sng/fermentord
go 1.16
require (
github.com/rs/zerolog v1.23.0
github.com/spf13/viper v1.3.2
github.com/warthog618/gpiod v0.6.0
modernc.org/sqlite v1.12.0
)

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github.com/russross/blackfriday v1.5.2/go.mod h1:JO/DiYxRf+HjHt06OyowR9PTA263kcR/rfWxYHBV53g=
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golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
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google.golang.org/grpc v1.24.0/go.mod h1:XDChyiUovWa60DnaeDeZmSW86xtLtjtZbwvSiRnRtcA=
gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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gopkg.in/ini.v1 v1.48.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
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gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
lukechampine.com/uint128 v1.1.1 h1:pnxCASz787iMf+02ssImqk6OLt+Z5QHMoZyUXR4z6JU=
lukechampine.com/uint128 v1.1.1/go.mod h1:c4eWIwlEGaxC/+H1VguhU4PHXNWDCDMUlWdIWl2j1gk=
modernc.org/cc/v3 v3.33.6/go.mod h1:iPJg1pkwXqAV16SNgFBVYmggfMg6xhs+2oiO0vclK3g=
modernc.org/cc/v3 v3.33.7 h1:Rvxffgx6LHSpGS6IO8bffSYN1wpPsWHEWY9CV95vpro=
modernc.org/cc/v3 v3.33.7/go.mod h1:iPJg1pkwXqAV16SNgFBVYmggfMg6xhs+2oiO0vclK3g=
modernc.org/ccgo/v3 v3.9.5/go.mod h1:umuo2EP2oDSBnD3ckjaVUXMrmeAw8C8OSICVa0iFf60=
modernc.org/ccgo/v3 v3.9.6 h1:rCjLgu6iRxK2bqq8A0CCOnDP+tdA81LfbBUlM1L6ZIY=
modernc.org/ccgo/v3 v3.9.6/go.mod h1:KGOi0NhaT6CO19xeSXcpXBl0OkoD6T1U4dPd633G9Sg=
modernc.org/httpfs v1.0.6 h1:AAgIpFZRXuYnkjftxTAZwMIiwEqAfk8aVB2/oA6nAeM=
modernc.org/httpfs v1.0.6/go.mod h1:7dosgurJGp0sPaRanU53W4xZYKh14wfzX420oZADeHM=
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modernc.org/opt v0.1.1 h1:/0RX92k9vwVeDXj+Xn23DKp2VJubL7k8qNffND6qn3A=
modernc.org/opt v0.1.1/go.mod h1:WdSiB5evDcignE70guQKxYUl14mgWtbClRi5wmkkTX0=
modernc.org/sqlite v1.12.0 h1:AMAOgk4CkblRJc6YLKSYtz3pZ6DW5wjQ1uYH/rN7/Kk=
modernc.org/sqlite v1.12.0/go.mod h1:ppqJ4cQ+R09YLzl9haEL9AYgj6wX8FcfwDTOI0nYykU=
modernc.org/strutil v1.1.1 h1:xv+J1BXY3Opl2ALrBwyfEikFAj8pmqcpnfmuwUwcozs=
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modernc.org/tcl v1.5.5/go.mod h1:ADkaTUuwukkrlhqwERyq0SM8OvyXo7+TjFz7yAF56EI=
modernc.org/token v1.0.0 h1:a0jaWiNMDhDUtqOj09wvjWWAqd3q7WpBulmL9H2egsk=
modernc.org/token v1.0.0/go.mod h1:UGzOrNV1mAFSEB63lOFHIpNRUVMvYTc6yu1SMY/XTDM=
modernc.org/z v1.0.1 h1:WyIDpEpAIx4Hel6q/Pcgj/VhaQV5XPJ2I6ryIYbjnpc=
modernc.org/z v1.0.1/go.mod h1:8/SRk5C/HgiQWCgXdfpb+1RvhORdkz5sw72d3jjtyqA=
sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=

36
internal/dal/db.go Normal file
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@ -0,0 +1,36 @@
package dal
import (
"database/sql"
_ "modernc.org/sqlite"
)
type DAL struct {
db *sql.DB
}
func NewDAL(dsn string) (*DAL, error) {
var err error
dal := &DAL{}
dal.db, err = sql.Open("sqlite", dsn)
if err != nil {
return nil, err
}
return dal, nil
}
func (dal *DAL) Close() error {
return dal.db.Close()
}
func (dal *DAL) Initialize() error {
// TODO
return nil
}
func (dal *DAL) SaveReading() {
// TODO
}

59
internal/hw/gpio.go Normal file
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@ -0,0 +1,59 @@
package hw
import (
"github.com/warthog618/gpiod"
)
const (
pinCoolerPower = 20
pinFanPower = 16
pinHeaterPower = 21
off = 0
on = 1
)
type Gpio struct {
chip *gpiod.Chip
coolerPower *gpiod.Line
fanPower *gpiod.Line
heaterPower *gpiod.Line
}
func NewGpio() (*Gpio, error) {
var err error
p := &Gpio{}
p.chip, err = gpiod.NewChip("gpiochip0", gpiod.WithConsumer("fermentord"))
if err != nil {
return nil, err
}
p.coolerPower, err = p.chip.RequestLine(pinCoolerPower, gpiod.AsOutput(1))
if err != nil {
return nil, err
}
p.fanPower, err = p.chip.RequestLine(pinFanPower, gpiod.AsOutput(1))
if err != nil {
return nil, err
}
p.heaterPower, err = p.chip.RequestLine(pinHeaterPower, gpiod.AsOutput(1))
if err != nil {
return nil, err
}
return p, nil
}
func (p *Gpio) Close() {
p.coolerPower.SetValue(off)
p.fanPower.SetValue(off)
p.heaterPower.SetValue(off)
p.heaterPower.Close()
p.fanPower.Close()
p.coolerPower.Close()
p.chip.Close()
}

54
pkg/onewire/ds18b20.go Normal file
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@ -0,0 +1,54 @@
package onewire
import (
"errors"
"io/ioutil"
"strconv"
"strings"
)
var (
ErrReadSensor = errors.New("Failed to read sensor temperature")
)
// Sensors returns an array of connected sensor IDs.
func Sensors() ([]string, error) {
data, err := ioutil.ReadFile("/sys/bus/w1/devices/w1_bus_master1/w1_master_slaves")
if err != nil {
return nil, err
}
sensors := strings.Split(string(data), "\n")
if len(sensors) > 0 {
sensors = sensors[:len(sensors)-1]
}
return sensors, nil
}
// Temperature returns the temperature of the specified sensor.
func Temperature(sensor string) (float64, error) {
sensorPath := "/sys/bus/w1/devices/" + sensor + "/w1_slave"
data, err := ioutil.ReadFile(sensorPath)
if err != nil {
return 0.0, err
}
raw := string(data)
if !strings.Contains(raw, " YES") {
return 0.0, ErrReadSensor
}
i := strings.LastIndex(raw, "t=")
if i == -1 {
return 0.0, ErrReadSensor
}
c, err := strconv.ParseFloat(raw[i+2:len(raw)-1], 64)
if err != nil {
return 0.0, err
}
return c / 1000.0, nil
}