necessaryEvil from nowOn: 2016

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

Pi, CLI Audio.

Link reference 1: https://www.raspberrypi.org/documentation/configuration/audio-config.md
Link reference 2: https://www.raspberrypi.org/documentation/usage/audio/

Switch audio output.
# amixer cset numid = 2 (2 is HDMI, 1 is Headphone jack, 0 is automatic by default )

Audio player.
# omxplayer example.mp3
# omxplayer -o hdmi example.mp3 (force output over HDMI)
# omxplayer -o local example.mp3 (force output over headphone jack)

Repeat playback
============
# omxplayer --loop example.mp3

[ Sys Reply ]
Audio codec mp3 channels 1 samplerate 11025 bitspersample 16
Subtitle count: 0, state: off, index: 1, delay: 0
Seek to: 00:00:00
Seek to: 00:00:00
Seek to: 00:00:00

[Ctrl + C] Quit player.

2016-12-15

Arduino, RGB sensor TCS34725.

Required library Adafruit_TCS34725.
Turn Off embedded LED, wired TCS34725 of LED pin to Arduino of GND pin.

2016-11-24

Arduino, Light Sensor.


#include 



IRsend irsend;



void setup()

{

     Serial.begin(115200);

     pinMode (A0, INPUT);

     pinMode (13, OUTPUT);

}



void loop()

{

     while (Serial.available() == 0);



     int pr  = analogRead(A0);

     int val = Serial.read();



     if (val == 81) {

             irsend.sendNEC( 0x1067A857, 32 );

             Serial.println( "NeoSaid: Received Q." );



     } else if (val == 87) {

             irsend.sendNEC( 0x1067A857, 32 );

             Serial.println( "NeoSaid: Received W." );



     } else if (val == 69) {

             Serial.println(pr);



             if (pr > 700) {

                     Serial.println( "NeoSaid: Light Up." );

             } else {

                     Serial.println( "NeoSaid: Light Down." );

             }



             Serial.println( "NeoSaid: Received E." );

     } else {

             Serial.println( "NeoSaid: Nothing found!!!" );

     }



     //Serial.println(val);

}

2016-11-21

Arduino 1 2 3

01- Power adapter support: DC 9V ~ 12V, 250mA or more.
02-

2016-11-09

Arduino, IR & LED indicator.

2016-11-01

Arduino, LED


int ledPin_Red = 12;

int ledPin_Green = 11;

int ledPin_Yellow = 10;



void setup()

{

  pinMode(ledPin_Red, OUTPUT);

  pinMode(ledPin_Green, OUTPUT);

  pinMode(ledPin_Yellow, OUTPUT);

}



void loop()

{

  digitalWrite(ledPin_Red, HIGH);

  delay(100);

  digitalWrite(ledPin_Green, HIGH);

  delay(100);

  digitalWrite(ledPin_Yellow, HIGH);

  delay(100);



  digitalWrite(ledPin_Red, LOW);

  delay(100);

  digitalWrite(ledPin_Green, LOW);

  delay(100);

  digitalWrite(ledPin_Yellow, LOW);

  delay(100);

}

2016-10-21

Android, input keycode

Command example: # input keyevent 03 ==> back to Home screen.

2016-10-20

Android 200, Image upgrade.

Step-01:

2016-10-18

Pi, GPIO

2016-05-17

Copy IR signal through Audio Editor.

Audio wave editor: Audacity (freeware)

A. Record IR
Config: 選擇正確麥克風輸入 --> (Mono) Record --> 麥克風聲音調至最大 --> 採樣率拉高一點 (預設 384000 is OK).

B. 複製一段 IR signal 做為待會新的正弦波參考用.
Operation 1: 軌道 ==> 新增 ==> Mono track
Operation 2: 開啟新軌道後, 下拉左邊音訊軌道 ==> Format 32bits ==> Rate 76,000Hz

D. 新增軌道3, 複製軌道2過來, 選擇 "效果" ==> "倒轉" 產生一個波形與軌道2相反的正弦波.

E. 合併兩個軌道 (2&3)
Operation: 於軌道2, 選擇 "音訊軌道" ==> "製作立體聲軌道"

2016-04-21

Andriod one two three

1. Capture screenshot through shell command.
# screencap -p /sdcard/screen.png

2. am [Activity Manager]
==> Active default browser and go to "google" directly.
# am start -a android.intent.action.VIEW -d http://www.google.com

==> Active Gallery3d to play movie file.
# am start -n com.android.gallery3d/.app.MovieActivity -d file:////sdcard/Movies//movie.ts

==> Open a JPEG file.
# am start -a android.intent.action.VIEW -d file:////data/worktmp//taiwan.jpg -t image/jpeg

==> Play a MP3 file.
# am start -a android.intent.action.VIEW -d file:///data/worktmp/1kTone.mp3 -t audio/mp3

3. Shutdown
    # reboot -p
                  -p: power off
    # busybox poweroff
    # am start -a android.intent.action.ACTION_REQUEST_SHUTDOWN --ez KEY_CONFIRM true --activity-clear-task

4. Reset to factory default.
    # am broadcast -a android.intent.action.MASTER_CLEAR

2016-03-17

LIRC, IR Transmitter [ irsend ]

Schematic (with Raspberry Pi)

(yellow, 3.5mm middle) PIN 17 [3.3V] ==> + IR LED - ==> [GND] PIN 06 (black, 3.5mm peak)

# irsend SEND_ONCE SHM38K KEY_OK


IRSEND OPTION

-- Help

-h --help display usage summary

-v --version display version

-d --device use given lircd socket [/var/run/lirc/lircd]

-a --address host[:port] connect to lircd at this address

-# --count n send command n times



-- DIRECTIVE can be:

SEND_ONCE - send CODE [CODE...] once

SEND_START - start repeating [CODE]

SEND_STOP - stop repeating [CODE]

LIST - list configured remote items

SET_TRANSMITTERS - set transmitters NUM [NUM...]

SIMULATE - simulate IR event

2016-03-16

LIRC, IR key mapping & Learning

# irrecord –d /dev/lirc0 lircd.conf

Pi, IR Receiver

VCC3.3V (Pin-01) ------------- IR receiver ( from left Pin-03)

GROUND ----------------------- IR receiver ( from left Pin-02)
GPIO-18 (Pin-12) -------------- IR receiver ( from left Pin-01)

2016-03-15

Linux, oneTwoThree

001- tar.bz2
tar jxvf filename.tar.bz2

002- USB-to-Serial ==> CentOS-5.5 not support HL-340 driver by default. Suggest to used PL2303.
# lsusb
# dmesg

003- Find the path.
# whereis wish
wish: /usr/bin/wish8.5

004- dmesg

# dmesg | more ==> Show event by pages.

# dmesg -c ==> clear previous event.

005- kill (find out process id and then kill)
# kill -9 $( ps -ef | grep wdt | awk '{ print $2 }')

006- pgrep & pkill (list process name & kill)
# pgrep -l [process name]
# pkill [process name]

2016-03-11

Pi, NFS server

NFS server (ip 10.1.1.16)
# apt-get install nfs-kernel-server nfs-common
# vim /etc/exports
/var/tmp *(ro,sync)
# /etc/init.d/nfs-kernel-server stop
# rpcbind
# /etc/init.d/nfs-kernel-server start