nodejs 로 온습도 센서 dht22에서 데이터 읽어오기
일단 nodejs 가 설치되고, npm(node package manager) 가 설치된 상태에서 무작정
$ npm install node-dht-sensor 을 실행 시키면 아래와 같은 에러가 발생한다.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | pi@raspberrypi:~/node_modules $ npm install node-dht-sensor / > node-dht-sensor@0.0.12 preinstall /home/pi/node_modules/node-dht-sensor > ./preinst +--------------------------------------------------------------------------------+ | ERROR: Library BCM2835 not found! | | Make sure you follow instructions from http://www.airspayce.com/mikem/bcm2835/ | | to install the BCM2835 library on your system first then install this addon. | +--------------------------------------------------------------------------------+ node-dht-sensor@0.0.12 node-dht-sensor └── nan@2.4.0 pi@raspberrypi:~/node_modules $ | cs |
BCM2835 관련 라이브러리를 먼저 설치한다.
$curl -O http://www.airspayce.com/mikem/bcm2835/bcm2835-1.36.tar.gz
$tar zxvf bcm2835-1.36.tar.gz
$cd bcm2835-1.36
$./configure
$make
$sudo make check
$sudo make install
위 명령어를 수행하는 과정을 아래에 나타내었다.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 | pi@raspberrypi:~ $ curl -O http://www.airspayce.com/mikem/bcm2835/bcm2835-1.36.tar.gz % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 234k 100 234k 0 0 130k 0 0:00:01 0:00:01 --:--:-- 130k pi@raspberrypi:~ $ tar zxvf bcm2835-1.36.tar.gz bcm2835-1.36/ bcm2835-1.36/config.sub bcm2835-1.36/ChangeLog bcm2835-1.36/doc/ bcm2835-1.36/doc/Makefile.am bcm2835-1.36/doc/Makefile.in bcm2835-1.36/doc/Doxyfile.in bcm2835-1.36/aclocal.m4 bcm2835-1.36/README bcm2835-1.36/src/ bcm2835-1.36/src/bcm2835.h bcm2835-1.36/src/Makefile.am bcm2835-1.36/src/bcm2835.c bcm2835-1.36/src/test.c bcm2835-1.36/src/Makefile.in bcm2835-1.36/INSTALL bcm2835-1.36/depcomp bcm2835-1.36/config.h.in bcm2835-1.36/config.guess bcm2835-1.36/configure.in bcm2835-1.36/NEWS bcm2835-1.36/COPYING bcm2835-1.36/Makefile.am bcm2835-1.36/ltmain.sh bcm2835-1.36/configure bcm2835-1.36/missing bcm2835-1.36/install-sh bcm2835-1.36/Makefile.in bcm2835-1.36/AUTHORS bcm2835-1.36/examples/ bcm2835-1.36/examples/blink/ bcm2835-1.36/examples/blink/blink.c bcm2835-1.36/examples/i2c/ bcm2835-1.36/examples/i2c/i2c.c bcm2835-1.36/examples/input/ bcm2835-1.36/examples/input/input.c bcm2835-1.36/examples/gpio/ bcm2835-1.36/examples/gpio/gpio.c bcm2835-1.36/examples/spin/ bcm2835-1.36/examples/spin/spin.c bcm2835-1.36/examples/event/ bcm2835-1.36/examples/event/event.c bcm2835-1.36/examples/spi/ bcm2835-1.36/examples/spi/spi.c bcm2835-1.36/examples/pwm/ bcm2835-1.36/examples/pwm/pwm.c pi@raspberrypi:~ $ cd bcm2835-1.36 pi@raspberrypi:~/bcm2835-1.36 $ ./configure checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for a thread-safe mkdir -p... /bin/mkdir -p checking for gawk... no checking for mawk... mawk checking whether make sets $(MAKE)... yes checking for style of include used by make... GNU checking for gcc... gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking dependency style of gcc... gcc3 checking for clock_gettime in -lrt... yes checking for doxygen... no configure: WARNING: Doxygen not found - continuing without Doxygen support checking for ranlib... ranlib checking for gcc... (cached) gcc checking whether we are using the GNU C compiler... (cached) yes checking whether gcc accepts -g... (cached) yes checking for gcc option to accept ISO C89... (cached) none needed checking dependency style of gcc... (cached) gcc3 checking that generated files are newer than configure... done configure: creating ./config.status config.status: creating Makefile config.status: creating src/Makefile config.status: creating doc/Makefile config.status: creating config.h config.status: executing depfiles commands pi@raspberrypi:~/bcm2835-1.36 $ make make all-recursive make[1]: Entering directory '/home/pi/bcm2835-1.36' Making all in src make[2]: Entering directory '/home/pi/bcm2835-1.36/src' gcc -DHAVE_CONFIG_H -I. -I.. -g -O2 -MT bcm2835.o -MD -MP -MF .deps/bcm2835.Tpo -c -o bcm2835.o bcm2835.c mv -f .deps/bcm2835.Tpo .deps/bcm2835.Po rm -f libbcm2835.a ar cru libbcm2835.a bcm2835.o ranlib libbcm2835.a make[2]: Leaving directory '/home/pi/bcm2835-1.36/src' Making all in doc make[2]: Entering directory '/home/pi/bcm2835-1.36/doc' make[2]: Nothing to be done for 'all'. make[2]: Leaving directory '/home/pi/bcm2835-1.36/doc' make[2]: Entering directory '/home/pi/bcm2835-1.36' make[2]: Leaving directory '/home/pi/bcm2835-1.36' make[1]: Leaving directory '/home/pi/bcm2835-1.36' pi@raspberrypi:~/bcm2835-1.36 $ sudo make check Making check in src make[1]: Entering directory '/home/pi/bcm2835-1.36/src' make test make[2]: Entering directory '/home/pi/bcm2835-1.36/src' gcc -DHAVE_CONFIG_H -I. -I.. -g -O2 -MT test.o -MD -MP -MF .deps/test.Tpo -c -o test.o test.c mv -f .deps/test.Tpo .deps/test.Po gcc -g -O2 -o test test.o ./libbcm2835.a -lrt make[2]: Leaving directory '/home/pi/bcm2835-1.36/src' make check-TESTS make[2]: Entering directory '/home/pi/bcm2835-1.36/src' PASS: test ============= 1 test passed ============= make[2]: Leaving directory '/home/pi/bcm2835-1.36/src' make[1]: Leaving directory '/home/pi/bcm2835-1.36/src' Making check in doc make[1]: Entering directory '/home/pi/bcm2835-1.36/doc' make[1]: Nothing to be done for 'check'. make[1]: Leaving directory '/home/pi/bcm2835-1.36/doc' make[1]: Entering directory '/home/pi/bcm2835-1.36' make[1]: Leaving directory '/home/pi/bcm2835-1.36' pi@raspberrypi:~/bcm2835-1.36 $ sudo make install Making install in src make[1]: Entering directory '/home/pi/bcm2835-1.36/src' make[2]: Entering directory '/home/pi/bcm2835-1.36/src' /bin/mkdir -p '/usr/local/lib' /usr/bin/install -c -m 644 libbcm2835.a '/usr/local/lib' ( cd '/usr/local/lib' && ranlib libbcm2835.a ) /bin/mkdir -p '/usr/local/include' /usr/bin/install -c -m 644 bcm2835.h '/usr/local/include' make[2]: Leaving directory '/home/pi/bcm2835-1.36/src' make[1]: Leaving directory '/home/pi/bcm2835-1.36/src' Making install in doc make[1]: Entering directory '/home/pi/bcm2835-1.36/doc' make[2]: Entering directory '/home/pi/bcm2835-1.36/doc' make[2]: Nothing to be done for 'install-exec-am'. make[2]: Nothing to be done for 'install-data-am'. make[2]: Leaving directory '/home/pi/bcm2835-1.36/doc' make[1]: Leaving directory '/home/pi/bcm2835-1.36/doc' make[1]: Entering directory '/home/pi/bcm2835-1.36' make[2]: Entering directory '/home/pi/bcm2835-1.36' make[2]: Nothing to be done for 'install-exec-am'. make[2]: Nothing to be done for 'install-data-am'. make[2]: Leaving directory '/home/pi/bcm2835-1.36' make[1]: Leaving directory '/home/pi/bcm2835-1.36' pi@raspberrypi:~/bcm2835-1.36 $ | cs |
아래 소스코드를 입력하여 humitemp.js 파일을 생성한다.
$sudo nano humitemp.js
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | var sensorLib = require('node-dht-sensor'); var sensor = { initialize: function() { return sensorLib.initialize(11, 4); }, read: function() { var readout = sensorLib.read(); console.log('Temperature: '+readout.temperature.toFixed(2)+'C, humidity: '+readout.humidity.toFixed(2)+'%'); setTimeout(function() { sensor.read(); }, 1500); } }; if (sensor.initialize()) { sensor.read(); } else { console.warn('Failed to initialize sensor'); } | cs |
온도 습도 관련 node 패키지를 설치하기 전에 반드시 명령어로 package.json파일을 만들어 준다.
작업 폴더는 nodejs-test 이다. 아래 순서대로 엔터를 입력하여
pi@raspberrypi:~/nodejs-test $ npm init
This utility will walk you through creating a package.json file.
It only covers the most common items, and tries to guess sensible defaults.
See `npm help json` for definitive documentation on these fields
and exactly what they do.
Use `npm install <pkg> --save` afterwards to install a package and
save it as a dependency in the package.json file.
Press ^C at any time to quit.
name: (nodejs-test)
version: (1.0.0)
Invalid version: " "
version: (1.0.0) 1.0.0
description: server side javascript sleepcare test
entry point: (dht11.js)
test command:
git repository:
keywords:
author:
license: (ISC)
About to write to /home/pi/nodejs-test/package.json:
{
"name": "nodejs-test",
"version": "1.0.0",
"description": "server side javascript sleepcare test",
"main": "dht11.js",
"dependencies": {
"node-dht-sensor": "^0.0.17"
},
"devDependencies": {},
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC"
}
Is this ok? (yes) yes
pi@raspberrypi:~/nodejs-test $
참고로 작업 폴더를 보여준다.
pi@raspberrypi:~/nodejs-test $ ls
bcm2835-1.36.tar.gz dht11.js helloworld.js humitemp-2.js humitemp-3.js humitemp.js node_modules
다음 온습도 센서 관련 node 패키지를 설치한다.
pi@raspberrypi:~/nodejs-test $ npm install node-dht-sensor --save
> node-dht-sensor@0.0.17 preinstall /home/pi/nodejs-test/node_modules/.staging/node-dht-sensor-446602ba
> ./check-lib.sh
Library bcm2835 found.
> node-dht-sensor@0.0.17 postinstall /home/pi/nodejs-test/node_modules/node-dht-sensor
> node-gyp rebuild
make: Entering directory '/home/pi/nodejs-test/node_modules/node-dht-sensor/build'
CXX(target) Release/obj.target/node_dht_sensor/node-dht-sensor.o
SOLINK_MODULE(target) Release/obj.target/node_dht_sensor.node
COPY Release/node_dht_sensor.node
make: Leaving directory '/home/pi/nodejs-test/node_modules/node-dht-sensor/build'
nodejs-test@1.0.0 /home/pi/nodejs-test
└── node-dht-sensor@0.0.17
npm WARN nodejs-test@1.0.0 No repository field.
마지막으로 작성한 파일을 실행하면 잘된다.
pi@raspberrypi:~/nodejs-test $ sudo node humitemp.js
Temperature: 27.30C, humidity: 42.70%
Temperature: 27.30C, humidity: 43.60%
Temperature: 27.30C, humidity: 43.60%
Temperature: 27.30C, humidity: 43.50%
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