LPG Leakage SMS Alert using MQ-135 – Get Warning Message in your Cellphone

In this article we are going to construct an GSM based LPG leakage SMS alert circuit using Arduino, which alerts the recipient via SMS and surrounding people via beep, when LPG gas leaks out from the LPG cylinder or if there’s leakage due to improperly closed valve. By: Girish Radhakrishanan Using MQ-135 as the Sensor … Read moreLPG Leakage SMS Alert using MQ-135 – Get Warning Message in your Cellphone

MQ-135 Air Quality Sensor Circuit – Working and Interfacing with Program Code

In this article we are going to learn how to interface air quality sensor MQ-135 with Arduino. We will see overview of the sensor and construct a project which detects LPG gas leakage and see some relevant readings in serial monitor. By: Arduino Guru What is MQ-135 sensor? MQ-135 is an air quality or air … Read moreMQ-135 Air Quality Sensor Circuit – Working and Interfacing with Program Code

How to Make a Transformer Winding Counter Circuit

The post details how to make a simple transformer winding counter circuit using ordinary LEDs and also through an advanced digital display circuit. The idea was requested by one of the dedicated readers of this blog Circuit Objectives and Requirements I want a circuit which counts a number of turns for winding a transformer which … Read moreHow to Make a Transformer Winding Counter Circuit

Deep Soil Metal Detector Circuit – Ground Scanner

The post discusses a simple deep under soil metal detector circuit for evaluating hidden metals such as gold, iron, tin, brass etc by detecting change in the resistance of the relevant soil layers. Bigger physical objects which might be buried within the topsoil could be unveiled through a modification in the electrical resistance of the … Read moreDeep Soil Metal Detector Circuit – Ground Scanner

How to Make a LED Room Thermometer Circuit

In this article, we are going to construct a LED room thermometer circuit using Arduino, which displays the readings in doted/bar LEDs. This project can be implemented for applications where ambient temperature plays a crucial role or it could be built just as another fun project for your home. Using DTH11 as the Temperature Sensor … Read moreHow to Make a LED Room Thermometer Circuit

Touch Sensor Relay ON OFF Switch Circuit using a Single IC 4017

A simple touch sensor switch circuit can be built using a single IC 4017 and a few other passive components, the procedure is explained in the following article. Using a 4017 IC for the Relay Touch Activation Referring to the below given circuit diagram for the proposed simple touch activated relay circuit, we can see … Read moreTouch Sensor Relay ON OFF Switch Circuit using a Single IC 4017