You can do that by adding the pi user to the tty and dialout groups. You’ll need to do this before running the Arduino IDE.
sudo usermod -a -G tty pi sudo usermod -a -G dialout pi
usermod: is a Linux program to manage users
-a -G: puts the user (pi) in the specified group (tty, then dialout)
Now you can run Arduino. Click Tools→Serial Port and select the serial port (most likely /dev/ttyACM0), then click Tools→Board select the type of Arduino Board you have (e.g. Uno)
$ ping 192.168.0.3
$ arp -a
PING the target machine so you have made contact with it and then issue the command arp -a to view your local arp table, which will list IP addresses and their corresponding MAC addresses eg:
arp - manipulate the system ARP cache
SYNOPSIS
arp [-vn] [-H type] [-i if] [-a] [hostname]
arp [-v] [-i if] -d hostname [pub]
arp [-v] [-H type] [-i if] -s hostname hw_addr [temp]
arp [-v] [-H type] [-i if] -s hostname hw_addr [netmask nm] pub
arp [-v] [-H type] [-i if] -Ds hostname ifname [netmask nm] pub
arp [-vnD] [-H type] [-i if] -f [filename]
DESCRIPTION
Arp manipulates or displays the kernel's IPv4 network neighbour cache. It can add entries to the table, delete one or display the current
content.
ARP stands for Address Resolution Protocol, which is used to find the media access control address of a network neighbour for a given IPv4
Address.
ref. http://flashgamer.com/arduino/comments/how-to-update-the-official-arduino-wifi-shield
http://arduino.cc/en/Hacking/WiFiShieldFirmwareUpgrading
Hardware: Arduino UNO rev.3, Arduino Wifi shield, usb mini cable
1. Install dfu-programmer
sudo apt-get install dfu-programmer
2. Download latest Wifi shield firmware
https://github.com/arduino/Arduino/tree/master/hardware/arduino/firmwares
또는, Aduino IDE software 에 포함된 Wifi shield 펌웨어 사용.
arduino-nightly/hardware/arduino/avr/firmwares/wifishield/binary/
3. Wifi shield 의 Power 핀과 Analog 핀 사이에 있는 점퍼 둘을 연결함
4. ArduinoWifiShield_upgrade.sh 스크립트를 실행
$ cd arduino-nightly/hardware/arduino/avr/firmwares/wifishield/scripts
–> ArduinoWifiShield_upgrade.sh 파일에서 경로수정
$ vi ArduinoWifiShield_upgrade.sh
# WIFI_FW_PATH=”/hardware/arduino/firmwares/wifishield/binary”
WIFI_FW_PATH=”/hardware/arduino/avr/firmwares/wifishield/binary”
$ sudo chmod a+x ArduinoWifiShield_upgrade.sh
- 스크립트 파일 도움말:
$ sudo ./ArduinoWifiShield_upgrade.sh -h
- 스크립트 파일 실행:
–> 옵션:
-a : Arduino IDE 설치 경로
-f : shield (Arduino WiFi Shield upgrade), all (Arduino WiFi Shield upgrade, HD WiFi module firmware)
sudo ./ArduinoWifiShield_upgrade.sh -a /home/jinny/App/arduino-nightly -f all
Arduino WiFi Shield upgrade
=========================================
Instructions:
To access to the USB devices correctly, the dfu-programmer needs to have the root permissions.
You can upgrade the firmware of the antenna togheter with the shield firmware or only the shield firmware
if there aren't changes on the antenna firmware.
Use the '-h' parameter for help
=========================================
****Upgrade HD WiFi module firmware****
Validating...
167732 bytes used (66.05%)
Press the RESET button on the shield then type [ENTER] to upgrade the firmware of the shield..
****Upgrade WiFi Shield firmware****
Validating...
261594 bytes used (103.01%)
Done. Remove the J3 jumper and press the RESET button on the shield.
Thank you!
5. 점퍼를 연결한 핀을 제거하고 Reset 버튼을 누룸.
ref. http://wiki.multimedia.cx/index.php?title=FFmpeg_Metadata
ffmpeg -i inputfile -metadata title="Movie Title" -metadata year="2010" outputfile
FFmpeg‘s mp3 muxer honors the following metadata keys:
avconv -i $TEMP_FLV -ac 2 -ab 128 -vn -y -metadata title=$PROGRAM_NAME"_"$REC_DATE -metadata artist=$RADIO_NAME -metadata album=$PROGRAM_NAME -metadata year=$REC_YEAR -f mp3 $MP3_FILE_NAME
EBS 라디오 방송 프로토콜이 RTMP 로 변경되어
rtmpdump와 avconv 패키지를 설치하여
flv 파일로 녹화하고 mp3 파일로 변환하는 스크립트 작성.
- 우분투 패키지 설치:
# flv 파일로 녹화하는 패키지 설치 $ sudo apt-get install rtmpdump # flv 파일을 mp3 형식으로 변환하는 패키지 설치 $ sudo apt-get install libav-tools
- EBS Radio 교육방송 녹음하기위한 쉘스크립트
$ vim EBS-Radio/recEBSRadio.sh #!/bin/bash RADIO_ADDR="rtmp://ebsandroid.nefficient.com/fmradiofamilypc/familypc1m" RADIO_NAME="ebs_radio" PROGRAM_NAME=$1 RECORD_MINS=$(($2 * 60)) DEST_DIR=$3 REC_DATE=`date +%Y%m%d-%H%M` REC_YEAR=`date +%Y` TEMP_FLV=`mktemp -u` MP3_FILE_NAME=$PROGRAM_NAME"_"$REC_DATE.mp3 rtmpdump -r $RADIO_ADDR -B $RECORD_MINS -o $TEMP_FLV avconv -i $TEMP_FLV -ac 2 -ab 128 -vn -y -metadata title=$PROGRAM_NAME"_"$REC_DATE -metadata artist=$RADIO_NAME -metadata album=$PROGRAM_NAME -metadata year=$REC_YEAR -f mp3 $MP3_FILE_NAME rm $TEMP_FLV mkdir -p $DEST_DIR mv $MP3_FILE_NAME $DEST_DIR
- crontab 에 등록하여 예약 녹화
$ crontab -e 20 07 * * 1-6 EBS-Radio/recEBSRadio.sh Easy-English 20 ~/EBS-Radio/easy-english &> /dev/null
avconv is a very fast video and audio converter that can also grab from
a live audio/video source. It can also convert between arbitrary sample
rates and resize video on the fly with a high quality polyphase filter.
ref. http://manpages.ubuntu.com/manpages/precise/man1/avconv.1.html
avconv 컨버터를 사용하려면 libav-tools 패키지를 설치한다.
$ sudo apt-get install libav-tools
EBS Radio 교육방송 녹음하기위한 쉡스크립트
#!/bin/bash RADIO_ADDR="rtmp://ebsandroid.nefficient.com/fmradiofamilypc/familypc1m" RADIO_NAME="ebs_radio" PROGRAM_NAME=$1 RECORD_MINS=$(($2 * 60)) DEST_DIR=$3 REC_DATE=`date +%Y%m%d-%H%M` TEMP_FLV=`mktemp -u` MP3_FILE_NAME=$PROGRAM_NAME"_"$REC_DATE.mp3 rtmpdump -r $RADIO_ADDR -B $RECORD_MINS -o $TEMP_FLV avconv -i $TEMP_FLV -ac 2 -ab 128 -vn -y -f mp3 $MP3_FILE_NAME rm $TEMP_FLV mkdir -p $DEST_DIR mv $MP3_FILE_NAME $DEST_DIR
ref. http://docs.mongodb.org/manual/tutorial/recover-data-following-unexpected-shutdown/
log file:
$ tail -f /var/log/mongodb/mongodb.log
mongodb data path:
/var/lib/mongodb/
- 2가지 방법 중에 2번째 방법으로 간단히 복구
1. mongod.lock 파일 삭제:
$ sudo rm /var/lib/mongodb/mongod.lock
2. mongod 를 –repair 옵션으로 복구 시작:
$ sudo mongod –dbpath /var/lib/mongodb –repair
$ sudo chown -R mongodb:mongodb /var/lib/mongodb
3. mongodb 시작:
$ sudo service mongodb start
$ sudo service mongodb status
$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 12.04.2 LTS Release: 12.04 Codename: precise
The lsb_release command provides certain LSB (Linux Standard Base) and distribution-specific information.
ubuntu server 12.04 를 부팅할 때,
grub prompt 상태에 들어가서
grub> _
더 이상 진행되지 않아 grub를 다시 설치해 문제를 해결했다.
ubuntu CD로 부팅해 복구시스템 모드로 들어가
grub를 설치함.
fdisk 로 부팅 파티션을 확인(*표시: /dev/sda1 *)
# sudo fdisk -l # sudo mount /dev/sda1 /mnt # sudo grub-install --boot-directory=/mnt/ /dev/sda # sudo reboot
Install required module:
sudo apt-get install mysql-client libmysqlclient-dev
Install mysql2
gem install mysql2
