diff --git a/config/config.go b/config/config.go
index c5caf0c..a14cf45 100644
--- a/config/config.go
+++ b/config/config.go
@@ -17,19 +17,21 @@ var (
 
 var (
 	thermocoupleTypes = map[string]thermocouple.Type{
-		"B": thermocouple.B,
-		"E": thermocouple.E,
-		"J": thermocouple.J,
-		"K": thermocouple.K,
-		"N": thermocouple.N,
-		"R": thermocouple.R,
-		"S": thermocouple.S,
-		"T": thermocouple.T,
+		"B":  thermocouple.B,
+		"E":  thermocouple.E,
+		"J":  thermocouple.J,
+		"K":  thermocouple.K,
+		"N":  thermocouple.N,
+		"R":  thermocouple.R,
+		"S":  thermocouple.S,
+		"T":  thermocouple.T,
+		"UV": thermocouple.None,
 	}
 	temperatureUnits = map[string]temperature.Unit{
-		"C": temperature.C,
-		"F": temperature.F,
-		"K": temperature.K,
+		"C":  temperature.C,
+		"F":  temperature.F,
+		"K":  temperature.K,
+		"UV": temperature.None,
 	}
 )
 
@@ -83,7 +85,7 @@ func Load() (config.Config, error) {
 		var head = fmt.Sprintf("Channel_%d", i)
 		v.SetDefault(head+".gain", 106.8)
 		v.SetDefault(head+".offset", 0.0)
-		v.SetDefault(head+".unit", "C")
+		v.SetDefault(head+".unit", "UV")
 	}
 
 	for i := 1; i < 8; i++ {
diff --git a/core/adapter.go b/core/adapter.go
index a2ce4fa..7bdf9fe 100644
--- a/core/adapter.go
+++ b/core/adapter.go
@@ -1,6 +1,7 @@
 package core
 
 import (
+	"th7/core/th7"
 	"th7/data/config"
 	"th7/ports"
 )
@@ -10,6 +11,6 @@ func NewAdapter(pcb ports.PCBPort, cfg config.Config) (ports.CorePort, error) {
 	if cfg.Board.Debug {
 		return NewDummyAdapter(pcb), nil
 	} else {
-		return NewTH7Adapter(pcb, cfg), nil
+		return th7.NewTH7Adapter(pcb, cfg), nil
 	}
 }
diff --git a/core/th7/service.go b/core/th7/service.go
new file mode 100644
index 0000000..075bb49
--- /dev/null
+++ b/core/th7/service.go
@@ -0,0 +1,74 @@
+package th7
+
+import (
+	"fmt"
+	"log"
+	"time"
+)
+
+const (
+	DurWaitBetweenChannel = 3 * time.Millisecond
+	DurWaitBetweenSample  = 1 * time.Millisecond
+	DurWaitRestart        = 500 * time.Millisecond
+)
+
+const (
+	Samples = 10
+)
+
+func alphaBetaFilter(arr []float64, init float64) float64 {
+
+	value := init
+	for i := range arr {
+		gain := 1.0 / (float64(i + 1))
+		value += (gain*arr[i] - value)
+	}
+	return value
+}
+
+func startCacheService(t *TH7Adapter) {
+
+	data := t.data
+
+	samples := make([][]float64, len(t.cfg.Channels))
+
+	// init
+	for i := range samples {
+		samples[i] = make([]float64, Samples)
+	}
+
+	for t.run {
+
+		for i := 0; i < Samples; i++ {
+
+			// update Table
+			t.pcbPort.UpdateTable()
+
+			for k := range t.cfg.Channels {
+				val, err := t.pcbPort.ReadChannel(t.cfg.Channels[k].Id)
+				if err != nil {
+					log.Printf("Error reading channel %d: %v\n", t.cfg.Channels[k].Id, err)
+				}
+
+				samples[k][i] = val
+				time.Sleep(DurWaitBetweenSample)
+			}
+			time.Sleep(DurWaitBetweenChannel)
+		}
+
+		// do alpha~beta on each channel,
+		// putting the value in
+
+		for i := range samples {
+			data[i].Value = alphaBetaFilter(samples[i], data[i].Value)
+		}
+
+		t.mu.Lock()
+		t.data = data
+		t.mu.Unlock()
+
+		fmt.Println("data updated ...")
+
+		time.Sleep(DurWaitRestart)
+	}
+}
diff --git a/core/th7.go b/core/th7/th7.go
similarity index 91%
rename from core/th7.go
rename to core/th7/th7.go
index 4acb0b3..36e2b00 100644
--- a/core/th7.go
+++ b/core/th7/th7.go
@@ -1,4 +1,4 @@
-package core
+package th7
 
 import (
 	"errors"
@@ -14,6 +14,8 @@ type TH7Adapter struct {
 	data    []core.Channel
 	lookup  map[int]int
 	table   core.Ratio
+	cfg     config.Config
+	run     bool
 }
 
 func NewTH7Adapter(pcbPort ports.PCBPort, cfg config.Config) *TH7Adapter {
@@ -21,6 +23,8 @@ func NewTH7Adapter(pcbPort ports.PCBPort, cfg config.Config) *TH7Adapter {
 	var adapter TH7Adapter
 
 	adapter.pcbPort = pcbPort
+	adapter.cfg = cfg
+	adapter.run = true
 
 	adapter.lookup = make(map[int]int)
 	adapter.data = make([]core.Channel, 0)
@@ -32,6 +36,8 @@ func NewTH7Adapter(pcbPort ports.PCBPort, cfg config.Config) *TH7Adapter {
 		adapter.data = append(adapter.data, channel)
 	}
 
+	go startCacheService(&adapter)
+
 	return &adapter
 }
 
diff --git a/data/core/data.go b/data/core/data.go
index 68e31a9..cd75f2a 100644
--- a/data/core/data.go
+++ b/data/core/data.go
@@ -1,9 +1,11 @@
 package core
 
+import "th7/data/temperature"
+
 type Channel struct {
-	Id      int     `json:"id"`
-	Uv      float64 `json:"uv"`
-	Celsius float64 `json:"celsius"`
+	Id    int              `json:"id"`
+	Value float64          `json:"value"`
+	Unit  temperature.Unit `json:"unit"`
 }
 
 type Ratio struct {
diff --git a/data/temperature/data.go b/data/temperature/data.go
index 77b421b..0bd0482 100644
--- a/data/temperature/data.go
+++ b/data/temperature/data.go
@@ -3,7 +3,7 @@ package temperature
 type Unit int
 
 const (
-	None Unit = iota
+	None Unit = iota // None is UV
 	K
 	C
 	F
diff --git a/db/dummy.go b/db/dummy.go
index a1767d1..9e921a3 100644
--- a/db/dummy.go
+++ b/db/dummy.go
@@ -2,6 +2,7 @@ package db
 
 import (
 	"fmt"
+	"th7/data/core"
 )
 
 type DummyAdapter struct {
@@ -15,6 +16,6 @@ func (d *DummyAdapter) Close() {
 	fmt.Println("Closing DB ...")
 }
 
-func (d *DummyAdapter) Save() {
+func (d *DummyAdapter) Save([]core.Channel) {
 	fmt.Println("Saving data to DB ...")
 }
diff --git a/db/logger/logger.go b/db/logger/logger.go
index 1d94aa2..ee9689e 100644
--- a/db/logger/logger.go
+++ b/db/logger/logger.go
@@ -1,6 +1,7 @@
 package logger
 
 import (
+	"fmt"
 	"th7/ports"
 	"time"
 )
@@ -19,7 +20,12 @@ func doLogging(log *Logger) {
 	for log.run {
 
 		time.Sleep(duration)
-		log.db.Save()
+
+		ch, err := log.core.GetChannels()
+		if err != nil {
+			fmt.Printf("error getting data for logger: %v\n", err)
+		}
+		log.db.Save(ch)
 	}
 }
 
diff --git a/db/sqlite3.go b/db/sqlite3.go
index c1d721e..8a0d43b 100644
--- a/db/sqlite3.go
+++ b/db/sqlite3.go
@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"sync"
+	"th7/data/core"
 
 	_ "github.com/mattn/go-sqlite3"
 )
@@ -52,7 +53,7 @@ func (ad *SQLite3Adapter) Close() {
 	ad.db.Close()
 }
 
-func (ad *SQLite3Adapter) Save() {
+func (ad *SQLite3Adapter) Save([]core.Channel) {
 	ad.mu.Lock()
 	defer ad.mu.Unlock()
 
diff --git a/main.go b/main.go
index 08b3c24..7fcde3c 100644
--- a/main.go
+++ b/main.go
@@ -24,7 +24,11 @@ func main() {
 	var err error
 
 	kill := make(chan os.Signal, 1)
-	signal.Notify(kill, syscall.SIGTERM, syscall.SIGINT)
+	signal.Notify(kill,
+		syscall.SIGTERM,
+		syscall.SIGINT,
+		syscall.SIGHUP,
+		syscall.SIGQUIT)
 
 	config, err := config.Load()
 	if err != nil {
diff --git a/pcb/adapter.go b/pcb/adapter.go
index 058be87..645dfaf 100644
--- a/pcb/adapter.go
+++ b/pcb/adapter.go
@@ -1,13 +1,10 @@
 package pcb
 
 import (
-	"th7/pcb/led"
 	"th7/ports"
 )
 
 func NewAdapter(LED bool) (ports.PCBPort, error) {
 
-	ledController := led.NewLEDController()
-
-	return NewDummyAdapter(LED, ledController)
+	return NewDummyAdapter(LED)
 }
diff --git a/pcb/dummy.go b/pcb/dummy.go
index 991583f..8a34a39 100644
--- a/pcb/dummy.go
+++ b/pcb/dummy.go
@@ -3,22 +3,17 @@ package pcb
 import (
 	"fmt"
 	"th7/data/pcb"
-	"th7/pcb/led"
 )
 
 type DummyAdapter struct {
-	table         pcb.Table
-	use_led       bool
-	ledController *led.LEDController
+	table   pcb.Table
+	use_led bool
 }
 
-func NewDummyAdapter(led bool, controller *led.LEDController) (*DummyAdapter, error) {
+func NewDummyAdapter(led bool) (*DummyAdapter, error) {
 	var adapter DummyAdapter
 
 	adapter.use_led = led
-	adapter.ledController = controller
-
-	adapter.ledController.Off()
 
 	return &adapter, nil
 }
diff --git a/pcb/led/led.go b/pcb/led/led.go
deleted file mode 100644
index 96f0bbe..0000000
--- a/pcb/led/led.go
+++ /dev/null
@@ -1,100 +0,0 @@
-package led
-
-import (
-	"sync"
-	"time"
-)
-
-const (
-	DurationFlick = 40 * time.Millisecond
-)
-
-type LEDController struct {
-	led1 bool
-	led2 bool
-	mu1  sync.Mutex
-	mu2  sync.Mutex
-}
-
-func NewLEDController() *LEDController {
-
-	var controller LEDController
-	controller.led1 = false
-	controller.led2 = false
-
-	return &controller
-}
-
-// turn both off
-func (c *LEDController) Off() {
-
-	c.led1 = true
-	c.led2 = true
-
-	c.Disable1()
-	c.Disable2()
-}
-
-func (c *LEDController) Enable1() {
-
-	if c.led1 {
-		return
-	}
-
-	c.led1 = true
-
-	// gpio code to turn LED 1 on
-}
-
-func (c *LEDController) Enable2() {
-
-	if c.led2 {
-		return
-	}
-
-	c.led2 = true
-
-	// gpio code to turn LED 2 on
-}
-
-func (c *LEDController) Disable1() {
-
-	if !c.led1 {
-		return
-	}
-
-	c.led1 = false
-
-	// gpio code to turn LED 1 off
-}
-
-func (c *LEDController) Disable2() {
-
-	if !c.led2 {
-		return
-	}
-
-	c.led2 = false
-
-	// gpio code to turn LED 2 off
-}
-
-func (c *LEDController) Flick1() {
-	c.mu1.Lock()
-	defer c.mu1.Unlock()
-
-	// assume it is off
-	c.Enable1()
-	time.Sleep(DurationFlick)
-	c.Disable1()
-}
-
-func (c *LEDController) Flick2() {
-	c.mu2.Lock()
-	defer c.mu2.Unlock()
-
-	// assume it is off
-	c.Enable2()
-	time.Sleep(DurationFlick)
-	c.Disable2()
-}
diff --git a/ports/db.go b/ports/db.go
index fd75e65..9a33913 100644
--- a/ports/db.go
+++ b/ports/db.go
@@ -1,6 +1,8 @@
 package ports
 
+import "th7/data/core"
+
 type DBPort interface {
 	Close()
-	Save()
+	Save([]core.Channel)
 }