necessaryEvil from nowOn

2018-03-09

Eclipse, show line number.

Path: Windows --> Preferences --> General --> Editors --> Text Editors --> Show line numbers

2018-02-25

Win7, VirtualBox - Resize hdd to bigger (20GB to 40GB).

Step-01: Extend to 40GB as example
# VBoxManager.exe modifyhd filePath:/virtual-HDD-filename.vdi --resize 40000

2018-01-29

2017-10-31

TCL, array 陣列

Example Code


array set familyName {

    papa Agent7 

    momo Agent8 

    son  Agent9 

}

Check ARRAY exist (1: true - 0: false)


# array exists family 

# 1

List ARRAY variable name


# array name family 

# sonName momoName papaName

Get ARRAY variable content


# array get family 

# sonName Agent9 momoName Agent8 papaName Agent7

Resurt


# puts $familyName(papa) 

# AgentPAPA 



# puts $familyName(momo) 

# AgentMOMO

2017-10-11

Arduino, DHT11 (Temperature, Humidity) & LCD indicator.

2017-07-19

2017-06-05

Arduino, Vibration Sensor SW420

Example Code


int pin_LED   = 13;

int pin_EP    = 9;



void setup() {

    Serial.begin(9600);

    pinMode (pin_LED, OUTPUT);

    pinMode (pin_EP, INPUT); //set EP input for measurment

}



void loop() {

    long measurement = TP_init(); //Vibration sensor.

    delay(50); // default is 50

    Serial.print( "key U:" ); Serial.print( " [" );  Serial.print( measurement ); Serial.print( "] " );



    if (measurement > 500){

            digitalWrite(pin_LED, HIGH);

            Serial.print( "Vibration Level: Earthquake." );



    } else if (measurement > 100){

            digitalWrite(pin_LED, HIGH);

            Serial.print( "Vibration Level: Shake Tea." );

            digitalWrite(pin_LED, LOW);

    } else {

            digitalWrite(pin_LED, LOW);

            Serial.print( "Vibration Level: Very Quiet." );

    }

}



long TP_init(){

    delay(10); // default is 10

    long measurement=pulseIn (pin_EP, HIGH);  //wait for the pin to get HIGH and returns measurement

    return measurement;

}

2017-01-11

Android, ADB push & pull file.

PUSH / PC to Android
Copy file from PC to Android through ADB shell.
Syntax | PC C:\ADB\adb push source_PC_filePath destination_Android_ filePath
example: adb push w200b\02-video\color2-green.mp4 data/worktmp

PULL / Android to PC
Copy file from Android to PC through ADB shell.
Syntax | PC C:\ADB\adb pull source_Android_filePath destination_PC_filePath
example: adb pull data/worktmp/SoundRecord.png w200b

2017-01-04

Android, NFC.

Turn ON NFC

# service call nfc 6

Turn OFF NFC

# service call nfc 5

Turn ON Anntenna ( Default is ON )

# echo 177 > /sys/class/gpio/export

# echo out > /sys/class/gpio/gpio177/direction

NFC test

# logcat BrcmNfcJni:D | grep 'nfc type='

(nfc tag碰觸，console 會出現以下, 或類似關鍵字出現)

D/BrcmNfcJni( 595): NfcTag::discoverTechnologies (activation): index=0; tech=1; handle=1; nfc type=2

Clear NFC Log

# logcat -c

2016-12-28

Android, Bluetooth.

04. Bluetooth config file.
# cat /data/misc/bluetooth/bt_config.xml

03. Get Bluetooth MAC.
# adb shell settings get secure bluetooth_address
or # settings get secure bluetooth_address
or # service call bluetooth_manager 10 (10 for Android 4, and 12 for Android 5)

02. Get Bluetooth connection via ADB.
# adb shell am start -a android.bluetooth.adapter.action.STATE_CHANGED

01- Turn ON/OFF Bluetooth via ADB.
Turn ON Bluetooth way 1.
step-1
# am start -a android.bluetooth.adapter.action.REQUEST_ENABLE
(but it required user to accept a dialog)

step-2 (dialog pop-up)
# input keyevent 22 & input keyevent 22

step-3
# input keyevent 23

Turn ON Bluetooth way 2.
# service call bluetooth_manager 6
(and no any accept dialog)

Turn OFF Bluetooth.
# service call bluetooth_manager 8