Add hardware support for door sensor and lights

cmd/fermentord/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
 	"log"
 	"net/http"
@@ -78,6 +79,35 @@ func mainLoop(ctx context.Context, wg *sync.WaitGroup, js nats.JetStream, config
 			ingest.AddReading(reading)
 			display.SetTemperature(reading)
 
+		case ev := <-gpio.C:
+			switch ev {
+			case hw.DoorClosed:
+				gpio.LightsOff()
+				gpio.StartFan()
+				ctrl.Resume()
+
+			case hw.DoorOpened:
+				ctrl.Pause()
+				gpio.LightsOn()
+				gpio.StopFan()
+			}
+
+			b, err := json.Marshal(map[string]interface{}{
+				"event": ev,
+			})
+			if err != nil {
+				hub.CaptureException(err)
+				log.Printf("Error marshaling JSON: %v", err)
+				break
+			}
+
+			// Publish to NATS
+			_, err = js.Publish(config.NATS.Subject.Event, b)
+			if err != nil {
+				hub.CaptureException(err)
+				log.Printf("Error publishing to NATS: %v", err)
+			}
+
 		case state := <-ctrl.C:
 			gpioSetState(state, gpio)
 			ingest.AddState(state)

internal/configuration/config.go

@@ -13,8 +13,9 @@ type Configuration struct {
 		URL     string `mapstructure:"url"`
 		Stream  string `mapstructure:"stream"`
 		Subject struct {
-			Temp  string `mapstructure:"temp"`
+			Event string `mapstructure:"event"`
 			State string `mapstructure:"state"`
+			Temp  string `mapstructure:"temp"`
 		} `mapstructure:"subject"`
 	} `mapstructure:"nats"`
 
@@ -55,6 +56,7 @@ func LoadConfiguration() *Configuration {
 
 	viper.SetDefault("http.port", 8000)
 	viper.SetDefault("nats.stream", "FERMENTOR")
+	viper.SetDefault("nats.subject.event", "FERMENTOR.event")
 	viper.SetDefault("nats.subject.state", "FERMENTOR.state")
 	viper.SetDefault("nats.subject.temp", "FERMENTOR.temp")
 	viper.SetDefault("nats.url", "nats.service.consul")

internal/controllers/chamber.go

@@ -34,6 +34,7 @@ type ChamberController struct {
 	lastChamberStateChange time.Time
 	lastCoolerStateChange  time.Time
 	C                      chan ChamberState
+	isPaused               bool
 
 	name string
 
@@ -43,6 +44,7 @@ type ChamberController struct {
 	wortTemperature    float64
 
 	chTemp  chan temperature.TemperatureReading
+	chPause chan bool
 
 	pid *PIDController
 	hub *sentry.Hub
@@ -55,6 +57,7 @@ func NewChamberController(name string, config configuration.Configuration) *Cham
 		config:        config,
 		pid:           NewPIDController(config.PID.Kp, config.PID.Ki, config.PID.Kd),
 		chTemp:        make(chan temperature.TemperatureReading),
+		chPause:       make(chan bool, 1),
 		chamberState:  ChamberStateIdle,
 		ConfigUpdates: make(chan configuration.Configuration, 1),
 		hub:           sentry.CurrentHub().Clone(),
@@ -78,11 +81,16 @@ func (p *ChamberController) Run(ctx context.Context, wg *sync.WaitGroup) {
 			p.chamberTemperature = t.Chamber
 			p.wortTemperature = t.Wort
 
+		case pause := <-p.chPause:
+			p.setPause(pause)
+
 		case c := <-p.ConfigUpdates:
 			p.config = c
 
 		case <-ctx.Done():
 			ticker.Stop()
+			close(p.chPause)
+			p.isPaused = false
 			p.setChamberState(ChamberStateIdle)
 			close(p.chTemp)
 			close(p.C)
@@ -96,12 +104,37 @@ func (p *ChamberController) SetTemperature(t temperature.TemperatureReading) {
 	p.chTemp <- t
 }
 
+// Pause is a thread-safe way to pause the controller.
+func (p *ChamberController) Pause() {
+	p.chPause <- true
+}
+
+// Resume is a thread-safe way to resume the controller.
+func (p *ChamberController) Resume() {
+	p.chPause <- false
+}
+
+func (p *ChamberController) setPause(pause bool) {
+	if pause {
+		p.setChamberState(ChamberStateIdle)
+		p.isPaused = true
+	} else {
+		p.isPaused = false
+		state := p.computeChamberState()
+		p.setChamberState(state)
+	}
+}
+
 func (p *ChamberController) setChamberState(state ChamberState) {
 	if state == p.chamberState {
 		return
 	}
 
-	//log.Printf("State changed from %v to %v", p.chamberState, state)
+	if p.isPaused {
+		return
+	}
+
+	log.Printf("State changed from %v to %v", p.chamberState, state)
 
 	if p.chamberState == ChamberStateCooling || state == ChamberStateCooling {
 		p.lastCoolerStateChange = time.Now()

internal/hw/gpio.go

@@ -1,38 +1,80 @@
 package hw
 
 import (
+	"time"
+
 	"github.com/warthog618/gpiod"
 )
 
 const (
+	pinDoorOpen    = 17
+	pinFanPower    = 22
 	pinCoolerPower = 23
 	pinHeaterPower = 24
+	pinLightsPower = 25
 
 	off = 0
 	on  = 1
 )
 
+type HWEvent int
+
+const (
+	NoOp HWEvent = iota
+	DoorClosed
+	DoorOpened
+)
+
 type Gpio struct {
 	chip        *gpiod.Chip
+	doorOpen    *gpiod.Line
+	lightsPower *gpiod.Line
+	fanPower    *gpiod.Line
 	coolerPower *gpiod.Line
 	heaterPower *gpiod.Line
+
+	C chan HWEvent
 }
 
 func NewGpio() (*Gpio, error) {
 	var err error
-	p := &Gpio{}
+	p := &Gpio{
+		C: make(chan HWEvent),
+	}
 
 	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))
+	p.doorOpen, err = p.chip.RequestLine(
+		pinDoorOpen,
+		gpiod.AsInput,
+		gpiod.LineBiasPullUp,
+		gpiod.WithDebounce(200*time.Millisecond),
+		gpiod.WithBothEdges,
+		gpiod.WithEventHandler(p.onDoorStateChanged),
+	)
 	if err != nil {
 		return nil, err
 	}
 
-	p.heaterPower, err = p.chip.RequestLine(pinHeaterPower, gpiod.AsOutput(1))
+	p.lightsPower, err = p.chip.RequestLine(pinLightsPower, gpiod.AsOutput(0))
+	if err != nil {
+		return nil, err
+	}
+
+	p.fanPower, err = p.chip.RequestLine(pinFanPower, gpiod.AsOutput(0))
+	if err != nil {
+		return nil, err
+	}
+
+	p.coolerPower, err = p.chip.RequestLine(pinCoolerPower, gpiod.AsOutput(0))
+	if err != nil {
+		return nil, err
+	}
+
+	p.heaterPower, err = p.chip.RequestLine(pinHeaterPower, gpiod.AsOutput(0))
 	if err != nil {
 		return nil, err
 	}
@@ -43,10 +85,17 @@ func NewGpio() (*Gpio, error) {
 func (p *Gpio) Close() {
 	p.coolerPower.SetValue(off)
 	p.heaterPower.SetValue(off)
+	p.fanPower.SetValue(off)
+	p.lightsPower.SetValue(off)
 
 	p.heaterPower.Close()
 	p.coolerPower.Close()
+	p.fanPower.Close()
+	p.lightsPower.Close()
+	p.doorOpen.Close()
 	p.chip.Close()
+
+	close(p.C)
 }
 
 func (p *Gpio) StartCooler() {
@@ -64,3 +113,29 @@ func (p *Gpio) StartHeater() {
 func (p *Gpio) StopHeater() {
 	p.heaterPower.SetValue(off)
 }
+
+func (p *Gpio) StartFan() {
+	p.fanPower.SetValue(on)
+}
+
+func (p *Gpio) StopFan() {
+	p.fanPower.SetValue(off)
+}
+
+func (p *Gpio) LightsOn() {
+	p.lightsPower.SetValue(on)
+}
+
+func (p *Gpio) LightsOff() {
+	p.lightsPower.SetValue(off)
+}
+
+func (p *Gpio) onDoorStateChanged(le gpiod.LineEvent) {
+	switch le.Type {
+	case gpiod.LineEventFallingEdge:
+		p.C <- DoorOpened
+
+	case gpiod.LineEventRisingEdge:
+		p.C <- DoorClosed
+	}
+}