1. Chameleon Display on Tizen
Embedded Software Lab., SKKU
Min Ji Kim, Daejun Park, Sihoon Choi

2. Goal Chameleon display using external sensor on ODUINO one
Temperature, Humidity from DHT11
Applying display color change with real-time sensor value

3. ODUINO One? Arduino UNO ODUINO ONE
Microcontroller board based on the ATmega328
ODUINO ONE
Arduino UNO + LCD/keypad shield + DHT11 + USB Cable
DHT11: Humidity and Temperature sensor module
DHT11
Arduino UNO
ODUINO One
Arduino UNO R3
LCD + keypad shield
Humidity and Temperature sensor module DHT 11
USB Cable

4.  Temperature, Humidity
Architecture
USB Connection
/dev/ttyACM#
(Kernel configuration setting)
Data Parsing
 Temperature, Humidity
File Read
sysfs
Periodic Update
/sys/class/Vsensor/oduino/oduino_sensor
fprintf(fd, temperature, humidity);
Tizen UI Framework

5. Implementation USB connection between Odroid & Arduino(with sensor)
Parsing to meaningful data
Temperature, Humidity
Data transferring with sysfs
Input data to UI framework
Rendering with input data
chameleonD
virtualSensor
UI Framework
EVAS

6. chameleonD main.cpp Using ecore main loop
Adding timer to update sensor value
ODUINO One default update period = 1 sec
Update new sensor value by 1.5 secs

7. chameleonD (cont’d) Update new sensor value with sysfs file
Reading sensor from ODUINO One

8. chameleonD (cont’d) oduinoSerialReader.cpp Device open &
Initialize connection setting
Parsing & Reading sensor value

9. virtualSensor oduino_sensor.c Create sysfs module
/sys/class/Vsensor/oduino/oduino_sensor

10. Evas rendering part UI framework(evas layer) Adding new API to draw
/src/lib/canvas/evas_render.c
Adding new API to draw
evas_temp_humid_apply(Evas* e)
Reading sysfs file to get temperature & humidity

11. Evas rendering part (Cont’d)
Adding new API to draw
evas_temp_humid_apply(Evas* e)
Calculate color vector with temperature & humidity
Adding new object to top layer
Touch disabling
Color setting
Drawing

12. Expectation Provide weather information with UI
Intuitively providing diverse information with UI to user
어려웠던 점

13. Results(Demo) Chameleon Display http://youtu.be/Flk99dcak5U
~0:30 : Booting
0:30~0:35 : initial temperature & humidity showing(HUMI: 34%, TEM: 26℃)
0:35~0:50 : Heating (HUMI: 49%, TEM: 31℃)
0:50~1:10 : More heating (HUMI: 71%, TEM: 33℃)
1:15~1:38 : Cooling (HUMI: 45%, TEM: 27℃)