Raspberry Pi 4
Raspberry Pi 4 전원
Raspberry Pi 4에서 사용하는 전원은 5.1v 3A로 PC의 USB의 전원으로 연결하면 정상적으로 운영이 되지 않는 것 같습니다.
OS설치 (NOOBS 설치)
아직 테스트가 더 필요하지만, 현재 배포 되는 Raspbian (2019-06-20 배포판) 의 이미지(img파일)파일 설치는 아직 설치가 안되는 것 같고, NOOBS (2019-06-24 배포판)으로 설치해보았습니다.
Micro HDMI
Micro HDMI 어댑터를 구입해서 기존에 사용하던 HDMI케이블에 연결해서 사용하면 문제 없이 사용이 가능했습니다.
한글폰트 설치
$ sudo apt install fonts-unfonts-core
RDP (원격 데스크톱) 설치
$ sudo apt-get install xrdp $ sudo apt-get install xorgxrdp
YouTube 시청
출처
Raspberry Pi 4 개봉기
주문한지 3일만에 받았습니다.
외관상 크기는 이전과 동일하지만 기존 pi3 케이스는 사용 할 수가 없어서 같이 주문한 케이스와 방열판을 붙여 보았습니다.
Raspberry Pi 4 스펙
출처
불필요한 패키지 제거
$ sudo apt-get purge wolfram-engine $ sudo apt-get purge libreoffice* $ sudo apt-get clean $ sudo apt-get autoremove
라즈비안(Raspberry pi OS)의 업데이트와 업그레이드
$ sudo apt-get update && sudo apt-get upgrade
OpenCV 4.1 관련 패키지 설치
OpenCV 빌드 관련 도구 설치
$ sudo apt-get install build-essential cmake unzip pkg-config
OpenCV 관련 라이브러리 설치
$ sudo apt-get install libjpeg-dev libpng-dev libtiff-dev $ sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev $ sudo apt-get install libxvidcore-dev libx264-dev
GTK 관련 라이브러리 설치
$ sudo apt-get install libgtk-3-dev
OpenCV 수치 최적화가 된 패키지 설치
$ sudo apt-get install libatlas-base-dev gfortran
Python3 설치
$ sudo apt-get install python3-dev
OpenCV 4.1 다운로드
OpenCV 4.1.0 소스 다운로드
$ cd ~ $ wget -O opencv.zip https://github.com/opencv/opencv/archive/4.1.0.zip $ wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/4.1.0.zip
압축풀기
$ unzip opencv.zip $ unzip opencv_contrib.zip
디렉토리명 변경
$ mv opencv-4.1.0 opencv $ mv opencv_contrib-4.1.0 opencv_contrib
OpenCV 4.1 용 Python 3 가상 환경 구성
pip 설치
$ wget https://bootstrap.pypa.io/get-pip.py
$ sudo python3 get-pip.py
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting pip
Downloading https://files.pythonhosted.org/packages/5c/e0/be401c003291b56efc55aeba6a80ab790d3d4cece2778288d65323009420/pip-19.1.1-py2.py3-none-any.whl (1.4MB)
|████████████████████████████████| 1.4MB 1.1MB/s
Installing collected packages: pip
Found existing installation: pip 18.1
Uninstalling pip-18.1:
Successfully uninstalled pip-18.1
Successfully installed pip-19.1.1
virtualenv, virtualenvwrapper 설치
$ sudo pip install virtualenv virtualenvwrapper $ sudo rm -rf ~/get-pip.py ~/.cache/pip
python3, virtualenv 환경설정
$ echo -e "\n# virtualenv and virtualenvwrapper" >> ~/.profile $ echo "export WORKON_HOME=$HOME/.virtualenvs" >> ~/.profile $ echo "export VIRTUALENVWRAPPER_PYTHON=/usr/bin/python3" >> ~/.profile $ echo "source /usr/local/bin/virtualenvwrapper.sh" >> ~/.profile $ source ~/.profile
가상환경을 만들고, OpenCV 4.1 관련 패키지 추가
$ mkvirtualenv cv -p python3 Already using interpreter /usr/bin/python3 Using base prefix '/usr' New python executable in /home/pi/.virtualenvs/cv/bin/python3 Also creating executable in /home/pi/.virtualenvs/cv/bin/python Installing setuptools, pip, wheel... done. virtualenvwrapper.user_scripts creating /home/pi/.virtualenvs/cv/bin/predeactivate virtualenvwrapper.user_scripts creating /home/pi/.virtualenvs/cv/bin/postdeactivate virtualenvwrapper.user_scripts creating /home/pi/.virtualenvs/cv/bin/preactivate virtualenvwrapper.user_scripts creating /home/pi/.virtualenvs/cv/bin/postactivate virtualenvwrapper.user_scripts creating /home/pi/.virtualenvs/cv/bin/get_env_details
workon 명령을 사용하여 cv 환경에 있는지 확인
pi@raspberrypi:~$ workon cv
(cv) pi@raspberrypi:~$
numpy 파이썬 패키지 설치(OpenCV관련 수학 함수 모음)
pi@raspberrypi:~$ workon cv (cv) pi@raspberrypi:~$ pip install numpy Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple Collecting numpy Using cached https://www.piwheels.org/simple/numpy/numpy-1.16.4-cp37-cp37m-linux_armv7l.whl Installing collected packages: numpy Successfully installed numpy-1.16.4 (cv) pi@raspberrypi:~$ python Python 3.7.3 (default, Apr 3 2019, 05:39:12) [GCC 8.2.0] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import numpy >>> quit()
OpenCV 컴파일
CMake 실행
$ cd ~/opencv
$ mkdir build
$ cd build
$ cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=/usr/local \
-D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib/modules \
-D ENABLE_NEON=ON \
-D ENABLE_VFPV3=ON \
-D BUILD_TESTS=OFF \
-D OPENCV_ENABLE_NONFREE=ON \
-D INSTALL_PYTHON_EXAMPLES=OFF \
-D OPENCV_GENERATE_PKGCONFIG=YES \
-D BUILD_EXAMPLES=OFF ..
... 생략 ...
-- General configuration for OpenCV 4.1.0 =====================================
-- Version control: unknown
--
-- Extra modules:
-- Location (extra): /home/pi/opencv_contrib/modules
-- Version control (extra): unknown
--
-- Platform:
-- Timestamp: 2019-07-01T15:38:09Z
-- Host: Linux 4.19.50-v7+ armv7l
-- CMake: 3.13.4
-- CMake generator: Unix Makefiles
-- CMake build tool: /usr/bin/make
-- Configuration: RELEASE
--
-- CPU/HW features:
-- Baseline: VFPV3 NEON
-- requested: DETECT
-- required: VFPV3 NEON
--
-- C/C++:
-- Built as dynamic libs?: YES
-- C++ Compiler: /usr/bin/c++ (ver 8.3.0)
-- C++ flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -mfpu=neon -mfp16-format=ieee -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
-- C++ flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -mfpu=neon -mfp16-format=ieee -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
-- C Compiler: /usr/bin/cc
-- C flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -mfpu=neon -mfp16-format=ieee -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG
-- C flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -mfpu=neon -mfp16-format=ieee -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG
-- Linker flags (Release): -Wl,--gc-sections
-- Linker flags (Debug): -Wl,--gc-sections
-- ccache: NO
-- Precompiled headers: YES
-- Extra dependencies: dl m pthread rt
-- 3rdparty dependencies:
--
-- OpenCV modules:
-- To be built: aruco bgsegm bioinspired calib3d ccalib core datasets dnn dnn_objdetect dpm face features2d flann freetype fuzzy gapi hfs highgui img_hash imgcodecs imgproc line_descriptor ml objdetect optflow phase_unwrapping photo plot python3 quality reg rgbd saliency shape stereo stitching structured_light superres surface_matching text tracking ts video videoio videostab xfeatures2d ximgproc xobjdetect xphoto
-- Disabled: world
-- Disabled by dependency: -
-- Unavailable: cnn_3dobj cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev cvv hdf java js matlab ovis python2 sfm viz
-- Applications: perf_tests apps
-- Documentation: NO
-- Non-free algorithms: YES
--
-- GUI:
-- GTK+: YES (ver 3.24.5)
-- GThread : YES (ver 2.58.3)
-- GtkGlExt: NO
-- VTK support: NO
--
-- Media I/O:
-- ZLib: /usr/lib/arm-linux-gnueabihf/libz.so (ver 1.2.11)
-- JPEG: /usr/lib/arm-linux-gnueabihf/libjpeg.so (ver 62)
-- WEBP: build (ver encoder: 0x020e)
-- PNG: /usr/lib/arm-linux-gnueabihf/libpng.so (ver 1.6.36)
-- TIFF: /usr/lib/arm-linux-gnueabihf/libtiff.so (ver 42 / 4.0.10)
-- JPEG 2000: build (ver 1.900.1)
-- OpenEXR: build (ver 1.7.1)
-- HDR: YES
-- SUNRASTER: YES
-- PXM: YES
-- PFM: YES
--
-- Video I/O:
-- DC1394: NO
-- FFMPEG: YES
-- avcodec: YES (58.35.100)
-- avformat: YES (58.20.100)
-- avutil: YES (56.22.100)
-- swscale: YES (5.3.100)
-- avresample: NO
-- GStreamer: NO
-- v4l/v4l2: YES (linux/videodev2.h)
--
-- Parallel framework: pthreads
--
-- Trace: YES (built-in)
--
-- Other third-party libraries:
-- Lapack: NO
-- Eigen: NO
-- Custom HAL: YES (carotene (ver 0.0.1))
-- Protobuf: build (3.5.1)
--
-- OpenCL: YES (no extra features)
-- Include path: /home/pi/opencv/3rdparty/include/opencl/1.2
-- Link libraries: Dynamic load
--
-- Python 3:
-- Interpreter: /home/pi/.virtualenvs/cv/bin/python3 (ver 3.7.3)
-- Libraries: /usr/lib/arm-linux-gnueabihf/libpython3.7m.so (ver 3.7.3)
-- numpy: /home/pi/.virtualenvs/cv/lib/python3.7/site-packages/numpy/core/include (ver 1.16.4)
-- install path: lib/python3.7/site-packages/cv2/python-3.7
--
-- Python (for build): /home/pi/.virtualenvs/cv/bin/python3
--
-- Java:
-- ant: NO
-- JNI: NO
-- Java wrappers: NO
-- Java tests: NO
--
-- Install to: /usr/local
-- -----------------------------------------------------------------
--
-- Configuring done
-- Generating done
-- Build files have been written to: /home/pi/opencv/build
SWAP 사이즈 늘리기
dphys-swapfile 편집
$ sudo vi /etc/dphys-swapfile
CONF_SWAPSIZE 값을 2024 (2GB)로 설정
# set size to absolute value, leaving empty (default) then uses computed value
# you most likely don't want this, unless you have an special disk situation
# CONF_SWAPSIZE=100
CONF_SWAPSIZE=2048
dphys-swapfile 재실행
$ sudo /etc/init.d/dphys-swapfile stop Stopping dphys-swapfile (via systemctl): dphys-swapfile.service. $ sudo /etc/init.d/dphys-swapfile start Starting dphys-swapfile (via systemctl): dphys-swapfile.service
OpenCV 컴파일
$ make -j4
OpenCV 설치
$ sudo make install $ sudo ldconfig
SWAP 이전 사이즈 돌려놓기
1. CONF_SWAPSIZE를 100MB로 재설정
2. 스왑 서비스를 재시작
OpenCV 4를 Python 3 가상 환경에 복사(소프트링크)
$ cd ~/.virtualenvs/cv/lib/python3.7/site-packages/ $ ln -s /usr/local/lib/python3.7/site-packages/cv2/python-3.7/cv2.cpython-37m-arm-linux-gnueabihf.so cv2.so $ cd ~
OpenCV 설치 확인
파이썬
$ workon cv $ python Python 3.7.3 (default, Apr 3 2019, 05:39:12) [GCC 8.2.0] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import cv2 >>> cv2.__version__ '4.1.0' >>> exit()
C++
#include "opencv2/opencv.hpp"
using namespace cv;
using namespace std;
int main( int argc, char** argv )
{
cout << "OpenCV version : " << CV_VERSION << endl;
cout << "Major version : " << CV_MAJOR_VERSION << endl;
cout << "Minor version : " << CV_MINOR_VERSION << endl;
cout << "Subminor version : " << CV_SUBMINOR_VERSION << endl;
}
$ g++ opencv_check_version.cpp -o opencv_check_version `pkg-config --cflags --libs opencv4` $ ./opencv_check_version OpenCV version : 4.1.0 Major version : 4 Minor version : 1 Subminor version : 0
출처
언어 설정
메뉴 [기본 설정] > [Raspberry Pi Configuration] 선택
탭 [Localisation] 선택
버튼 [Set Locale...] 선택하고, 팝업 창[Locale] 에서 Language, Character Set 설정
버튼 [Set Timezone...] 선택하고, 팝업 창[Timezone] 에서 Area, Location 설정
버튼 [Set Keyboard...] 선택하고, 팝업 창[Keyboard] 에서 Model, Layout, Variant 설정
버튼 [Set WiFi Country Code...] 선택하고, 팝업 창[WiFi Country Code] 에서 Country 설정
한글 입력기(uim) 설치
$ sudo apt-get install uim uim-byeoru fonts-unfonts-core
uim로 입력기 설정
$ im-config -n uim
입력기 설정 확인
$ cat .xinputrc ## im-config(8) generated on Sat, 20 Oct 2018 21:14:47 +0900 run_im uim ## im-config signature: 7e7926db202ba349880ee57ac6ef0013 -
입력기 설정 후 재부팅
$ sudo shutdown -r now
uim 입력기 설정
메뉴 [기본 설정] > [Raspberry Pi Configuration] 선택
[디폴트 입력기 지정]에서 ]디폴트 입력기]를 [벼루]로 설정
[Display behavior]에서 [Display]를 Never로 설정
[전체] 켜기, [전체] 끄기를 한영전환키 설정과 충돌이 생기지 않도록 비워두고 적용
벼루 키 설정 1
출처
spi 활성화
$ sudo raspi-config
개발도구 설치
$ sudo apt-get install python-dev python-setuptools
소스 다운로드 및 설치
$ wget -O InkypHAT.tar.gz https://github.com/pimoroni/inky-phat/archive/v0.1.0.tar.gz $ tar xvf InkypHAT.tar.gz $ cd inky-phat-0.1.0/library/ $ sudo python setup.py install
예제 실행
$ cd ~/inky-phat-0.1.0/examples/ $ python cal.py
출처
Driver 다운로드
$ wget http://kedei.net/raspberry/v6_1/LCD_show_v6_1_3.tar.gz
압축해제 후 설치(LCD에 화면 출력)
$ tar xvf LCD_show_v6_1_3.tar.gz $ cd LCD_show_v6_1_3 $ sudo ./LCD35_v
다시 HDMI로 화면 출력
$ sudo ./LCD_hdmi
본 체험 제품은 아이씨뱅큐㈜ 에서 진행하는 무상 체험단 활동으로 작성한 것입니다.
출처
MJPG streamer 컴파일 관련 라이브러리 설치
$ sudo apt-get update $ sudo apt-get upgrade $ sudo apt-get install cmake libjpeg8-dev imagemagick libv4l-dev
MJPG streamer 소스 다운로드, 컴파일, 설치
$ git clone https://github.com/jacksonliam/mjpg-streamer.git $ cd mjpg-streamer/mjpg-streamer-experimental/ $ make $ sudo make install
LD_LIBRARY_PATH 경로 추가
$ echo "export LD_LIBRARY_PATH=\$LD_LIBRARY_PATH:/usr/local/lib:/usr/local/lib/mjpg-streamer" | sudo tee -a /etc/profile
MJPG Streamer 실행
출처 : MJPG Streamer configuration
$ mjpg_streamer -i "input_raspicam.so -x 640 -y 480 -fps 10 -rot 180 -ex night" --output "output_http.so -w /usr/local/share/mjpg-streamer/www --port 8080"
또는
$ mjpg_streamer -i "input_raspicam.so -x 320 -y 240 -quality 30 -fps 15 -rot 180 -ex night"
MJPG Streamer 실행 - 최적옵션
$ mjpg_streamer -i "input_uvc.so -r 320x240 -f 10 -y" --output "output_http.so -w /usr/local/share/mjpg-streamer/www --port 8080"
V4L2(Video4Linux2) 부팅시 활성화 시키기
$ sudo vi /etc/modules
아래 내용 추가
bcm2835-v4l2
서비스등록
$ sudo vi /etc/init.d/mjpg_streamer
mjpg_streamer 파일 내용
#!/bin/bash
# /etc/init.d/mjpg_streamer.sh
# v0.2 phillips321.co.uk
### BEGIN INIT INFO
# Provides: mjpg_streamer.sh
# Required-Start: $network
# Required-Stop: $network
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: mjpg_streamer for webcam
# Description: Streams /dev/video0 to http://IP/?action=stream
### END INIT INFO
#
export width=640
export height=480
export bitrate=10
export SHUTDOWN_WAIT=2
if [ -n "$2" ]; then
width=$2
fi
if [ -n "$3" ]; then
height=$3
fi
if [ -n "$4" ]; then
bitrate=$4
fi
export LD_MJPG_STREAMER=/usr/local/lib/mjpg-streamer
f_message(){
echo "[+] $1"
}
mjpg_streamer_pid() {
echo `ps aux | grep mjpg-streamer | grep -v grep | awk '{ print $2 }'`
}
start() {
pid=$(mjpg_streamer_pid)
if [ -n "$pid" ]
then
echo "mjpg_streamer is already running (pid: $pid)"
else
# Start mjpg_streamer
f_message "Starting mjpg_streamer"
mjpg_streamer -b -i "$LD_MJPG_STREAMER/input_uvc.so -r "$width"x"$height" -f $bitrate -y" -o "$LD_MJPG_STREAMER/output_http.so -p 8080 -w /usr/local/share/mjpg-streamer/www"
sleep 2
f_message "mjpg_streamer started"
fi
return 0
}
stop() {
pid=$(mjpg_streamer_pid)
if [ -n "$pid" ]
then
f_message "Stopping mjpg_streamer..."
kill -9 $pid
let kwait=$SHUTDOWN_WAIT
let count=0;
until [ `ps -p $pid | grep -c $pid` = '0' ] || [ $count -gt $kwait ]
do
echo -n -e "\nwaiting for processes to exit";
sleep 1
let count=$count+1;
done
if [ $count -gt $kwait ]; then
echo -n -e "\nkilling processes which didn't stop after $SHUTDOWN_WAIT seconds\n"
kill -9 $pid
fi
else
echo "mjpg_streamer is not running"
fi
return 0
}
# Carry out specific functions when asked to by the system
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
stop
sleep 2
start
;;
resolution)
resolution=`ps axu | grep mjpg-streamer | grep -v grep | awk '{ print $16 }'`
if [ -n "$resolution" ];
then
echo "${resolution}"
else
echo "0x0"
fi
;;
status)
pid=`ps -A | grep mjpg_streamer | grep -v "grep" | grep -v mjpg_streamer. | awk '{print $1}' | head -n 1`
if [ -n "$pid" ];
then
f_message "mjpg_streamer is running with pid ${pid}"
f_message "mjpg_streamer was started with the following command line"
cat /proc/${pid}/cmdline ; echo ""
else
f_message "Could not find mjpg_streamer running"
fi
;;
*)
f_message "Usage: $0 {start|stop|status|restart}"
exit 1
;;
esac
exit 0
등록
$ sudo chmod u+x /etc/init.d/mjpg_streamer $ sudo update-rc.d mjpg_streamer defaults
서비스 실행 및 실행 확인
$ sudo service mjpg_streamer start
$ sudo service mjpg_streamer status
[0m mjpg_streamer.service - LSB: mjpg_streamer for webcam
Loaded: loaded (/etc/init.d/mjpg_streamer)
Active: active (running) since Sat 2016-05-21 15:18:17 UTC; 8s ago
Process: 1373 ExecStop=/etc/init.d/mjpg_streamer stop (code=killed, signal=TERM)
Process: 1403 ExecStart=/etc/init.d/mjpg_streamer start (code=exited, status=0/SUCCESS)
CGroup: /system.slice/mjpg_streamer.service
붴1407 mjpg_streamer -b -i /usr/local/lib/mjpg-streamer/input_uvc.so -r 320x240 -f 10 -y -o /usr/local/lib/mjpg-s...
May 21 15:18:15 raspberrypi mjpg_streamer[1407]: MJPG-streamer [1407]: TV-Norm...........: DEFAULT
May 21 15:18:15 raspberrypi mjpg_streamer[1403]: enabling daemon modeforked to background (1407)
May 21 15:18:15 raspberrypi mjpg_streamer[1407]: MJPG-streamer [1407]: www-folder-path...: /usr/local/share/mjpg-streamer/www/
May 21 15:18:15 raspberrypi mjpg_streamer[1407]: MJPG-streamer [1407]: HTTP TCP port.....: 8080
May 21 15:18:15 raspberrypi mjpg_streamer[1407]: MJPG-streamer [1407]: username:password.: disabled
May 21 15:18:15 raspberrypi mjpg_streamer[1407]: MJPG-streamer [1407]: commands..........: enabled
May 21 15:18:15 raspberrypi mjpg_streamer[1407]: MJPG-streamer [1407]: starting input plugin /usr/local/lib/mjpg-stream...vc.so
May 21 15:18:15 raspberrypi mjpg_streamer[1407]: MJPG-streamer [1407]: starting output plugin: /usr/local/lib/mjpg-stre...: 00)
May 21 15:18:17 raspberrypi mjpg_streamer[1403]: [+] mjpg_streamer started
May 21 15:18:17 raspberrypi systemd[1]: Started LSB: mjpg_streamer for webcam.
Hint: Some lines were ellipsized, use -l to show in full.
확인
html 코드
출처 : mjpegcanvasjs / Tutorials / CreatingASingleStreamCanvas
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<script type="text/javascript" src="eventemitter2.min.js"></script>
<script type="text/javascript" src="mjpegcanvas.min.js"></script>
<script type="text/javascript" type="text/javascript">
/**
* Setup all visualization elements when the page is loaded.
*/
function init() {
// Create the main viewer.
var viewer = new MJPEGCANVAS.Viewer({
divID : 'mjpeg',
host : '192.168.0.14',
port : '8080',
width : 640,
height : 480,
topic : '/?action=stream'
});
}
</script>
</head>
<body onload="init()">
<h1>Simple MJPEG Canvas Example</h1>
<div id="mjpeg"></div>
</body>
</html>
라즈베리파이3 Model B+ 공식 구입처 : 아이씨뱅큐 http://www.icbanq.com/
마이크로비트 공식 카페 : http://cafe.naver.com/bbcmicro
아이씨뱅큐 공식 블로그 : http://blog.naver.com/icbanq
본 체험 제품은 아이씨뱅큐㈜ 에서 진행하는 무상 체험단 활동으로 작성한 것입니다.
출처
배선
소스 (L298NMain.java)
import com.pi4j.io.gpio.GpioController;
import com.pi4j.io.gpio.GpioFactory;
import com.pi4j.io.gpio.GpioPinDigitalOutput;
import com.pi4j.io.gpio.RaspiPin;
public class L298NMain {
private static GpioController gpio = null;
static GpioPinDigitalOutput pin1;
static GpioPinDigitalOutput pin2;
public static void forword() {
System.out.println("GPIO Forward");
pin1.high();
pin2.low();
}
public static void backword() {
System.out.println("GPIO Backward");
pin1.low();
pin2.high();
}
public static void stopFB() {
System.out.println("GPIO Stop Back Wheel");
pin1.low();
pin2.low();
/*
try {
Thread.sleep(700);
} catch (Exception e) {
e.printStackTrace();
}
*/
}
public static void main(String[] args) throws Exception {
gpio = GpioFactory.getInstance();
//gpio.setMode(PinMode.DIGITAL_OUTPUT);
pin1 = gpio.provisionDigitalOutputPin(RaspiPin.GPIO_08);
pin2 = gpio.provisionDigitalOutputPin(RaspiPin.GPIO_09);
forword();
Thread.sleep(2000);
backword();
Thread.sleep(2000);
stopFB();
gpio.shutdown();
}
}
컴파일
$ javac -cp .:lib/pi4j-core.jar L298NMain.java
실행
$ java -cp .:lib/pi4j-core.jar L298NMain
실행 영상
라즈베리파이3 Model B+ 공식 구입처 : 아이씨뱅큐 http://www.icbanq.com/
마이크로비트 공식 카페 : http://cafe.naver.com/bbcmicro
아이씨뱅큐 공식 블로그 : http://blog.naver.com/icbanq