satishgunjal

import subprocess

try:
    output = subprocess.check_output(['sudo', 'iwgetid'])
    print("Connected Wifi SSID: " + output.split('"')[1])
except Exception, e:
    print e

satishgunjal

To modify a python script started from from rc.local follow below steps.

1. Login using putty
2. ps aux | grep 'the-name-of-your-progam' (The number in the second column is the pid. Use that pid to send the process a termination signal)
3. kill -TERM [put-your-pid-here]
4. Now check again >>  ps aux | grep 'the-name-of-your-progam'
5. If program is stopped now modify the program and test it before adding to rc.local

satishgunjal

Most relay boards are 'ACTIVE LOW' which means: 0 or LOW (0V) = Relay ON, 1 or HIGH (3V3) = Relay OFF.

Some relay board have high and low level trigger mode selection. We can use jumper pin to select the mode the mode.

If low level level trigger mode is selected then Relay on will occure for control signal 0 / false / ground

If high level trigger mode is selected then Relay on will occure for control signal 1 / true / 3V3/ Vcc or Vdd

Ref. https://robu.in/product/songle-single-channel-5v-30a-relay-module-power-failure-relay/
Above 5V 30A relay module has trigger mode selection. I have tested it with Low level trigger mode only.

satishgunjal

Using optocoupler from Raspberry pi GPIO to control the single channel relay board(5v,30A).
Optocoupler will protect the Raspberry PI from any back EMF from inductive load like water pump, Cooler or exhaust fans.

satishgunjal

## Add proxy to node.js
npm config set https-proxy http://165.225.104.34

## Remove proxy from node.js
npm config delete proxy

satishgunjal

VS Code ships with a Git source control manager (SCM) extension.
But to use it with GitHub public/private repository please install Git on PC. Make sure to install the latest version of Git.
Go to 'https://github.com/' and create new repository for your project. e.g. gitTest
Now click on 'Clone or Download' and copy the url .e.g. https://github.com/satishgunjal/gitTest.git
Now open the terminal from VS Code and go to the location where you want to create this project directoty.
e.g. terminal path:> C:\Users\satish.gunjal\Google Drive\My Projects\Node.js\Workspace
'gitTest' Project folder will be created under 'Workspace' folder in file system
Now select Terminal Window and type:
git config --global user.name <github userID>
git clone <URL from github link copied earlier> >> this will create the 'gitTest' folder under 'Workspace' folder

satishgunjal

Ref. https://blog.cloudboost.io/nodejs-pm2-startup-on-windows-db0906328d75

In above document Ref Section : [1b]> PM2 save
This section explains how to configure one application and save the configurations. 
But if we run 'pm2 save' cmd it will override the previous configurations.
In order to start multiple applications together load all the applications using command 'pm2 reload ecosystem.config.js --env=production'
and then run 'pm2 save' command at the end. It takes a snapshot of currently running Node applications.

We can then restore these applications using 'pm2 resurrect'. Same command will be called during windows reboot.

satishgunjal

1. Run below command on terminal from where you want to copy the packeges or supprting files
   "npm pack"
   for more details about this command ref. https://docs.npmjs.com/cli/pack.html
2. Now copy the entire source code folder icluding 'node_modules' on host PC
3. And run below command from host PC terminal 'npm install <name>-<version>.tgz'. Here name is from step 1
4. Now your code should work on host PC.
5. In case any error change the project name in 'package.json' on host PC.

satishgunjal

1. Go to C:\Users\<my_username>\AppData\Roaming and locate the .gitkraken folder
2. Inside this folder you can find a localRepoCache file.
3. Remove the entries that areunwanted/ duplicated, and restart the Gitkraken.

satishgunjal

import pkg_resources
import types
def get_imports():
    for name, val in globals().items():
        if isinstance(val, types.ModuleType):
            name = val.__name__.split(".")[0]

        elif isinstance(val, type):
            name = val.__module__.split(".")[0]