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Newly Updated Circuit Projects:

How to Connect a TSOP1738 IR Sensor

Last Updated on January 30, 2026 by Swagatam 74 Comments

TSOP17XX series devices are advanced infrared sensors having a specified center frequency of operation which makes their detection extremely reliable and foolproof. In this post I have explained how to connect a TSOP series infrared sensor and use it for a specified IR remote control operations. TSOP IR Sensor Specifications A TSOP series of IR […]

Filed Under: Electronics Theory, Sensors and Detectors Tagged With: Connect, IR, Sensor, TSOP1738

Battery Deep Discharge Protection Circuit

Last Updated on January 28, 2026 by Swagatam 115 Comments

preventing battery from deep discharge compressed

In this post I have explained how to build a battery deep discharge protection circuit which can be used for protecting any type of battery from over discharge through a connected load. Normally, we are mostly worried about battery getting over charged, and forget about a situation where the battery can get over discharged by […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Deep, Discharge, Protection

Making a Single Channel Oscilloscope using Arduino

Last Updated on January 28, 2026 by Swagatam 24 Comments

lcdconn

In this interesting post, we are going to make a simple single channel oscilloscope using Arduino and a personal computer, where the waveforms will be showcased on the PC’s display and frequency and time period of the input waves will be displayed on the 16 x 2 display.  Introduction Every electronics enthusiast once said “I […]

Filed Under: Arduino Projects, Meters and Testers Tagged With: Arduino, Channel, Making, Oscilloscope, Single

Electronic Voting Machine with SD Card Module

Last Updated on January 28, 2026 by Swagatam 10 Comments

EVM 2

In this post I will show how to construct a circuit for an Electronic Voting Machine using Arduino and SD card module where the election data is stored in the SD card.  UPDATE: This circuit has been upgraded to an improved version in which the results can be viewed over an attached LCD display, you […]

Filed Under: Arduino Projects Tagged With: Card, Electronic, Machine, Module, SD, Voting

Programmable Humidity Controller Circuit

Last Updated on January 26, 2026 by Swagatam 46 Comments

humiditysensorcircuit

The simple programmable humidity sensor circuit I have explained in this article can be used for controlling or maintaining a suitable level of humidity inside a close premise. The circuit could be used in poultry farms or similar areas where humidity level becomes crucial for keeping the animals healthy. The idea was requested by Mr. […]

Filed Under: Water Controller Tagged With: Controller, Humidity, Programmable

Automatic Irrigation Circuit using Arduino

Last Updated on January 26, 2026 by Swagatam 7 Comments

In this post I will show how to construct an automated water irrigation system for small garden using arduino and soil moisture sensor. Introduction The proposed system can monitor the soil moisture level and when soil moisture goes below preset value, the 12V DC pump will be triggered for predetermined period of time. The status […]

Filed Under: Arduino Projects, Automation Projects Tagged With: Arduino, Automatic, Irrigation

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