All posts by Manoj R. Thakur

About Manoj R. Thakur

In 2014 I started contributing to Open Source electronics, and life has just gotten better from there. Founder of Maven Technologies.

Arduino relay module interface

The new KEYES 5V Relay Module is perfectly made for Arduino application. It has three pins, the VCC, GND and Signal. It can act as switch if the circuit and the load circuit have different supply voltage. It is commonly use if the load circuit is AC. It is a switch used to connect isolated connection from the circuit using a circuit signal. It has red LED that turns on every time the coil is energized or the signal pin has a high input. Commonly used in automation control circuit, it is actually a small Current to control a large current operation “automatic switch.”

Arduino Connection with Relay Module

Arduino Relay Module Interface

For the DC part of the circuit:

Arduino digital pin 10 –> module pin S
Arduino GND –> module pin –
Arduino +5V –> module pin +

AC Part of the circuit:

On the AC side connect your feed to Common (middle contact) and use NO (Normally Open) to Lamp. It will get power when (S) is high.

Warning: Always be very careful when experimenting with AC, electrical shock can result in serious injures.

Relay module from bottom side is open when AC is connected do not touch the circuit.

Arduino Program for Relay module

This program will turn on and off the Lamp. Similar to Blink example. You can see module led also blinks.

Is Your IoT Device a threat to security

Threats to the Internet of Things Security

The last few years have been really exciting for the Internet of Things (IOT) community. Lots of new and exciting IoT products have been released but even though these products still remain on the fringe of true success, there are already controversies behind them with regards to security. Are your Iot devices a threat to security?

There is an estimated 26-50 billion connected devices that are expected to be sharing data with each other and the internet. Hackers have reportedly been able to obtain data access to a wide variety of connected devices. This has become a huge concern over the security threats of the Internet of Things.

This concernisusually not something consumers would think about before we buy our favorite products from Apple and Samsung.Many consumers are still unaware that their connected devices could be infiltrated and used to conduct a cyber-attacks and other security threats. The question is, would a simple security PIN code fix this problem? The answer is No.There is a security studyconducted by the brand Hewlett-Packard of 10 most popular connected devices exposed the amount of flaws in securitythat threaten the consumer market. There is a total of 250 flaws in security which is about 25 per device. Moreover, even though the company never revealed exactly what brands and the models they used for the testing, the constant factor was the stripped down version of what Linux they were running.

Having ourselves protected from information thieves is going to be a best practice for us in the near future. Hopefully there would be more public awareness campaign when it comes to internet security and the internet of thing and theIOT manufacturers will start toimplement better security measures for their products and services.

Please visit (external linkElectronic Products Magazine for more news IOT news and updates

Standard Resistor Values

Resistors and Capacitors are types of passive electronic components. The basic unit of resistance is the ohm (Ω) and capacitance is Farad.

Standard base resistor values are given in the following tables for the most commonly used tolerances (1%, 2%, 5%, 10%), along with typically available resistance ranges.

In 1952 the IEC (International Electrotechnical Commission) decided to define the resistance and tolerance values into a norm, to ease the mass manufacturing of resistors. These are referred to as preferred values or E-series, and they are published in standard IEC 60063:1963. These standard values are also valid for other components like capacitors, inductors and Zener diodes. The preferred values for resistors were established in 1952, but the concept of the geometric series was already introduced by army engineer Renard in the 1870s. Continue reading Standard Resistor Values

Resistor Color Code Calculator

The electronic color code is used to indicate the values or ratings of electronic components, usually for resistors, but also for capacitors, inductors, diodes and others. A separate code, the 25-pair color code, is used to identify wires in some telecommunications cables.

Standard Resistor and Capacitor values with IEC and EIA code is explained in previous post.

This tool is used to decode information for color banded axial lead resistors. Select their colors to determine the value and tolerance of the resistor.

Continue reading Resistor Color Code Calculator

IoT Based Temperature Monitoring System

Measuring temperature is one of the most common technique used because it is important for many operations and tasks to be performed like in any industries where heaters are used, heat up to a certain temperature is required. When it comes to sensing temperature, a temperature sensor is used that is installed at a place whose temperature is to be sensed. The temperature of that place can be monitored through internet using internet of things. Continue reading IoT Based Temperature Monitoring System