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How to Make a RFID based Attendance System

Last Updated on December 5, 2024 by Swagatam 19 Comments

LCD

In this post I will show how to construct a RFID based attendance system, which can record attendance of 12 students / staffs for a given time window and this system can record up to 255 attendances per person. What is RFID Attendance System We don’t need any introduction regarding the RFID based attendance system, […]

Filed Under: Arduino Projects Tagged With: Attendance, Based, RFID, System

SMS Based Water Supply Alert System

Last Updated on December 5, 2024 by Swagatam 17 Comments

SMS based Water notification schematic

In this post I will show how to construct a circuit which will notify the user via SMS if the water supply to you area / home is initiated. It can show the time when the water is begin to supply and ended, average water flow speed in liter per minute and total water delivered […]

Filed Under: Arduino Projects, Water Controller Tagged With: Alert, Based, SMS, Supply, System, Water

SMS Based Pump Controller with Automatic Dry Run Shut Off

Last Updated on December 5, 2024 by Swagatam 17 Comments

irrigation system

In this post I will show how to construct a SMS based water pump controller with automatic shutdown of pump when no water flow through the pump is detected.  We will also construct another much simpler automatic dry run preventer circuit without GSM in the next half of the article. What is Dry Run in […]

Filed Under: Arduino Projects, Automation Projects Tagged With: Automatic, Based, Controller, Pump, Shut, SMS

Timer Based Cell Phone Charger Circuit

Last Updated on July 6, 2019 by Swagatam 70 Comments

timer2Bcharger

A simple cell phone charger with timer circuit is presented in the following article, which could be used for charging a given Mobile phone for a specified predetermined length of time. The idea was requested by Mr. Saad. Circuit Objectives and Requirements Could you design me this charger circuit ? Input 230V 60 Hz, and the […]

Filed Under: Battery Charger Circuits, Timer and Delay Relay Tagged With: Based, Cell, Charger, Phone, Timer

SMS Based Laser Security Circuit

Last Updated on September 11, 2019 by Swagatam 36 Comments

blockdiagram

In this post, I will show how to construct a laser security circuit which can send SMS alert to owner of the property or anyone else and activate loud alarm to deter the crook, which can be interfaced via relay. We always fear about crooks especially when we leave our property alone, this where security […]

Filed Under: Security and Alarm Tagged With: Based, Laser, Security, SMS

Arduino based Battery Over Discharge Protection Circuit

Last Updated on November 4, 2020 by Swagatam 37 Comments

over2Bdischarge2Bprotection

In this post, I will show how to construct a over discharge protection circuit for 12v battery using Arduino   which can protect 12V SLA battery against over discharge, and also protect the connected load from over voltage in case of overcharged battery is connected. Understanding Battery Charge/Discharge Rates All the batteries have natural decline, […]

Filed Under: Battery Charger Circuits Tagged With: Arduino, Based, Battery, Discharge, Over, Protection

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