How to install latest Node.js in Raspberry Pi (Raspbian OS)?

1. Go to https://nodejs.org and look for the current version of node.js. At this moment, for me version 9.5.0 is the current version.
2. Open Terminal and Type
   • curl -sL https://deb.nodesource.com/setup_9.x | sudo -E bash -
   • Note: in future if you see the current version 10.x.x then in the URL above replace setup_9.x with setup_10.x
   • sudo apt-get install nodejs
   • sudo apt-get install npm
   • sudo npm i -g npm
   • In order for some npm packages to work (such as those that require building from source), you will need to install the build-essentials package.
   • sudo apt-get install build-essential

Install BCM2835 in Raspberry Pi

1. Go to : http://www.airspayce.com/mikem/bcm2835 and check for the latest version of the library. For me it is bcm2835-1.55 now.
2. Open Terminal and type: wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.55.tar.gz
3. tar zxvf bcm2835-1.55.tar.gz : This will unzip this file.
4. cd bcm2835-1.55 : Go to this directory
5. ./configure
6. make
7. sudo make check
8. sudo make install

How to run this code?

Method 1 (from git):

• To install git on your Raspberry Pi, open terminal and Type:
  • sudo apt-get install git-core
• git clone https://github.com/apal21/Raspberry-Pi-DHT11-Node.js
• cd Raspberry-Pi-DHT11-Node.js
• npm install
• node index.js or npm run test

Method 2 (Using NPM):

• mkdir DHT11 && cd DHT11
• npm init --yes
• nano index.js and paste the content of this repo's index.js file.
• npm install node-dht-sensor
• node index.js