diff --git a/candump.go b/candump.go
index 3038df0..37d44e9 100644
--- a/candump.go
+++ b/candump.go
@@ -5,6 +5,7 @@ import (
 	"flag"
 	"fmt"
 	"os"
+	"reflect"
 )
 
 func main() {
@@ -12,6 +13,7 @@ func main() {
 	flag.Parse()
 
 	var frames <-chan *CanFrame
+	last := make(map[interface{}]interface{})
 
 	switch {
 	case len(*filename) > 0:
@@ -28,16 +30,17 @@ func main() {
 
 	events := FromCanFrames(frames)
 
-	fmt.Printf("Value %v", PARKING)
-
 	for event := range events {
 
-		switch msg := event.(type) {
-		default:
-			fmt.Println(msg)
-		}
+		eventType := reflect.TypeOf(event)
 
-		fmt.Println(event.GetValue())
+		lastValue := last[eventType]
+		value, date := event.GetValue()
+
+		if lastValue != value {
+			fmt.Printf("%v | %s = %v\n", *date, eventType, value)
+			last[eventType] = value
+		}
 
 		//if msg, isType := event.(MaximumBatteryVoltage); isType {
 		//	fmt.Printf("MaximumBatteryVoltage: %v\n", msg.GetMaxBattVoltage())
diff --git a/chademo.go b/chademo.go
index 8bb0678..6900d3d 100644
--- a/chademo.go
+++ b/chademo.go
@@ -36,7 +36,8 @@ type ContactorVehicleStatus uint8
 type StopRequest uint8
 
 type ChademoEvent interface {
-	GetValue() interface{}
+	// GetValue Return processed/calculated value and timestamp string
+	GetValue() (interface{}, *string)
 }
 
 type frame struct {
@@ -197,84 +198,84 @@ func bytesToUint16(bytes []uint8) uint16 {
 	return result
 }
 
-func (m MaximumBatteryVoltage) GetValue() interface{} {
-	return bytesToUint16(m.payload[4:6])
+func (m MaximumBatteryVoltage) GetValue() (interface{}, *string) {
+	return bytesToUint16(m.payload[4:6]), &m.date
 }
 
-func (c ConstChargingRateInd) GetValue() interface{} {
-	return c.payload[6]
+func (c ConstChargingRateInd) GetValue() (interface{}, *string) {
+	return c.payload[6], &c.date
 }
 
-func (b BatteryCapacity) GetValue() interface{} {
-	return 0.1 * float32(bytesToUint16(b.payload[5:7]))
+func (b BatteryCapacity) GetValue() (interface{}, *string) {
+	return 0.1 * float32(bytesToUint16(b.payload[5:7])), &b.date
 }
 
-func (m MaxChargingTimeS) GetValue() interface{} {
-	return 10 * uint16(m.payload[1])
+func (m MaxChargingTimeS) GetValue() (interface{}, *string) {
+	return 10 * uint16(m.payload[1]), &m.date
 }
 
-func (m MaxChargingTimeM) GetValue() interface{} {
-	return m.payload[2]
+func (m MaxChargingTimeM) GetValue() (interface{}, *string) {
+	return m.payload[2], &m.date
 }
 
-func (e EstChargingTimeM) GetValue() interface{} {
-	return e.payload[3]
+func (e EstChargingTimeM) GetValue() (interface{}, *string) {
+	return e.payload[3], &e.date
 }
 
-func (c ControlProtocolNumber) GetValue() interface{} {
-	return c.payload[0]
+func (c ControlProtocolNumber) GetValue() (interface{}, *string) {
+	return c.payload[0], &c.date
 }
 
-func (t TargetBatteryVoltage) GetValue() interface{} {
-	return bytesToUint16(t.payload[1:3])
+func (t TargetBatteryVoltage) GetValue() (interface{}, *string) {
+	return bytesToUint16(t.payload[1:3]), &t.date
 }
 
-func (c ChargingCurrentReq) GetValue() interface{} {
-	return c.payload[3]
+func (c ChargingCurrentReq) GetValue() (interface{}, *string) {
+	return c.payload[3], &c.date
 }
 
-func (c ChargingRate) GetValue() interface{} {
-	return c.payload[6]
+func (c ChargingRate) GetValue() (interface{}, *string) {
+	return c.payload[6], &c.date
 }
 
-func (s ShiftLever) GetValue() interface{} {
-	return getVehicleShiftLever(&s.payload)
+func (s ShiftLever) GetValue() (interface{}, *string) {
+	return getVehicleShiftLever(&s.payload), &s.date
 }
 
-func (v VehicleCharging) GetValue() interface{} {
-	return getVehicleCharging(&v.payload)
+func (v VehicleCharging) GetValue() (interface{}, *string) {
+	return getVehicleCharging(&v.payload), &v.date
 }
 
-func (c ChargingSystemFault) GetValue() interface{} {
-	return getFault(&c.payload, 5, 2)
+func (c ChargingSystemFault) GetValue() (interface{}, *string) {
+	return getFault(&c.payload, 5, 2), &c.date
 }
 
-func (v VehicleStatus) GetValue() interface{} {
-	return getVehicleStatus(&v.payload)
+func (v VehicleStatus) GetValue() (interface{}, *string) {
+	return getVehicleStatus(&v.payload), &v.date
 }
 
-func (n NormalStopReq) GetValue() interface{} {
-	return getNormalStopReq(&n.payload)
+func (n NormalStopReq) GetValue() (interface{}, *string) {
+	return getNormalStopReq(&n.payload), &n.date
 }
 
-func (b BattOvervoltage) GetValue() interface{} {
-	return getFault(&b.payload, 4, 0)
+func (b BattOvervoltage) GetValue() (interface{}, *string) {
+	return getFault(&b.payload, 4, 0), &b.date
 }
 
-func (b BattUndervoltage) GetValue() interface{} {
-	return getFault(&b.payload, 4, 1)
+func (b BattUndervoltage) GetValue() (interface{}, *string) {
+	return getFault(&b.payload, 4, 1), &b.date
 }
 
-func (b BattCurrentDeviationErr) GetValue() interface{} {
-	return getFault(&b.payload, 4, 2)
+func (b BattCurrentDeviationErr) GetValue() (interface{}, *string) {
+	return getFault(&b.payload, 4, 2), &b.date
 }
 
-func (h HighBattTemperature) GetValue() interface{} {
-	return getFault(&h.payload, 4, 3)
+func (h HighBattTemperature) GetValue() (interface{}, *string) {
+	return getFault(&h.payload, 4, 3), &h.date
 }
 
-func (b BattVoltageDeviationErr) GetValue() interface{} {
-	return getFault(&b.payload, 4, 4)
+func (b BattVoltageDeviationErr) GetValue() (interface{}, *string) {
+	return getFault(&b.payload, 4, 4), &b.date
 }
 
 func (v VehicleChargingEnabled) String() string {