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New Circuit Projects

RFID Security Lock Circuit – Full Program Code and Testing Details

Last Updated on August 9, 2019 by Swagatam 6 Comments

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In this article we will see how an Arduino based RFID reader circuit could be used for controlling a relay, which in turn could be used in security door lock applications. Overview If you haven’t yet checked the previous RFID article, please go ahead check it out, it covered the basics of RFID technology. We […]

Filed Under: Security and Alarm Tagged With: Code, Full, Lock, Program, RFID, Security

Triac Phase Control using PWM Time Proportional

Last Updated on January 2, 2024 by Swagatam 19 Comments

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A triac phase control using a PWM circuit can be useful only if it’s implemented using a time-proportional format, otherwise the response could be haphazard and inefficient. In a few of of my earlier articles as given below: Simple Remote Controlled Fan Regulator Circuit Push Button Fan Regulator with Display Circuit Dimmer Circuit for LED […]

Filed Under: Voltage Control and Protection Tagged With: Control, Phase, Proportional, PWM, Time, Triac

RFID Reader Circuit using Arduino

Last Updated on December 31, 2019 by Swagatam 7 Comments

In this article we are going to take a tour on RFID circuit technology. We will be exploring how RFID tags and readers work, how to interface RFID module (RC522) with Arduino and extract some useful information from the RFID tags. Using RFID Tags I am sure every one of you has used RFID to […]

Filed Under: Transmitter Circuits Tagged With: Arduino, Reader, RFID

Arduino Barometric Pressure Sensor Circuit – Working and Interfacing Details

Last Updated on November 25, 2023 by Swagatam 4 Comments

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In this article we are going to explore, what is a Barometer and how to interface a barometric BMP180 sensor with Arduino. We will also be exploring some of its important specification and finally I have explained how to predict weather using barometric readings. What is Barometer? Barometer is an instrument for measuring atmospheric pressure. […]

Filed Under: Sensors and Detectors Tagged With: Arduino, Barometric, Interfacing, Pressure, Sensor, Working

How to make a Remote Controlled Game Scoreboard Circuit

Last Updated on July 8, 2019 by Swagatam 6 Comments

In this post I have explained how to build a simple remote controlled game scoreboard circuit with two digits for facilitating the user a hassle free changing of the digits remotely, during a game or a match. The idea was requested by Mr. Richard. Circuit Objectives and Requirements For our co-ed volleyball game we use […]

Filed Under: Remote Control Circuits Tagged With: Controlled, Game, Remote, Scoreboard

Single LM317 based MPPT Simulator Circuit

Last Updated on July 15, 2019 by Swagatam 119 Comments

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To make this simple MPPT circuit we first modify a standard LM317 power supply circuit into a buck converter then configure it with a solar panel for implementing an MPPT function. Modifying a LM317 Power Supply into an MPPT Solar Optimizer In our previous article I have explained how a standard LM317 power supply could […]

Filed Under: Solar Controller Circuits Tagged With: Based, LM317, MPPT, Simulator, Single

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