All posts by Arun

Electronic Devices – Inductor

An inductor is a coil of wound on a core. An inductor opposes the sudden variation of current. an inductor stores the energy in the form of current in magnetic field. The coil blocks DC inductor allows the Direct current

L=µ o µr A N2/l Henry

  • l=length of the core,
  • µ o=permeability of free space,
  • µr=relative permeability of the core material,
  • A=area of cross-section of the coil, N=length of the core,


8051 Interface – Servo

A stepper motor is one of the most commonly used motor for precise angular movement. The advantage of using a stepper motor is that the angular position of the motor can be controlled without any feedback mechanism. The stepper motors are widely used in industrial and commercial applications. They are also commonly used as in drive systems such as robots, washing machines etc.

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Stepper motors can be unipolar or bipolar and here we are using unipolar stepper motor. The unipolar stepper motor consists of six wires out of which four are connected to coil of the motor and two are common wires. Each common wire is connected to a voltage source and remaining wires are connected to the microcontroller.


8051 Interface – Keypad



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Keypad is a widely used input device with lot of applications such as telephone, computer, ATM, electronic lock etc. A keypad is used to take input from the user for further processing. Here a 4 by 3 matrix keypad consisting of switches arranged in rows and columns is interfaced to the microcontroller. A 16 by 2 LCD is also interfaced for displaying the output. The interfacing concept of keypad is very simple. Every number of keypad is assigned two unique parameters that are row and column (R, C). Hence every time a key is pressed the number is identifying by detecting the row and column numbers of keypad.


Mongoose-OS – Get Start

Mongoose-OS IDE’s

  • Web Browser based
  • Visual basic extensions

mos tool

What is mos tool ?

  • We need IDE for our project development.
  • mos tool like a web browser based IDE.
  • we can use the mos tool to firmware upload & update, Build the firmware from c source, debug purpose and so on.


IOT Dashboard – Grafana






How Install the grafana in windows

Notes : We tested and installed on 2018 April 17th


Download Grafana

Configure Grafana

  • Go to conf  directory and copy the defaults.ini  file and rename the defaults - Copy.ini  file as custom.ini .
  • Edit the custom.ini  file and change the default grafana port is 3000  instead of 8080 . (Note:- Mostly at line 35)

Install Grafana using NSSM

  • Download the latest release of NSSM software and extract anywhere in your machine. Copy the  nssm.exe  file and paste in c:\  Directory (Installed : nssm 2.24)
  • Run the command  c:\>nssm install Grafana  from Administrator command prompt.
  • It will Pop-Up the NSSM Service Installer

  • Choose the Grafana path in the application tab (Ex: C:\grafana-5.0.4\bin\grafana-server.exe )
  • The Startup directory automatically added when selscted the correct path (Ex: C:\grafana-5.0.4\bin )
  • Set the Display Name as Grafana in Details tab (Ex : Grafana )
  • Set startup type: as Automatic (Delayed Start)  in Details tab
  • Log on tab choose Local System account  if you don’t have grafana credentials. else you have then choose This account  and enter the mail id  and set password  then confirm  again.
  • Everything Well now click the Install service button then you can see the status of installation in Command prompt like below


Run the Grafana

  • Open windows services in command prompt :- c:\>services.msc
  • RUn the Service Grafana .(Right Click and start Service)
  • Go to any browser and hit the details  http://localhost:8080/  .
  • You can see the Grafana login page, enter the credentials username : admin  and password : admin

  • Done



Grafana We host It

Note : This free service only for single user and up-to 5 dashboards with SSL. Tested on 2018 April 17 using Mozilla Firefox Browser.

  • Go to
  • Pop up windows shows if your not login or sign up
  • Log in after select Plan as free
  • Choose your preferred URL and make sure its available Ex :
  • Select I agree to the terms of service & MSA
  • Click Create Hosted Instance
  • Then Go to your URL then wait a minutes (Ex: ), It will redirect to login page.
  • Once you logged on you can see the dashboard



  • How to upload the data into grafana?


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