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Alcohol Detector Meter Circuit using MQ-3 Sensor Module

MQ-3 sensor LM393 comparator circuit

The simple alcohol detector circuit discussed here will accurately sense the emanation of alcohol gas from a selected source, such as from the mouth of a drunkard, when used as a breathalyzer. It’s cheap and a useful device which can be used by all authorized personnel such as a cops or traffic police for nabbing drunken … Read moreAlcohol Detector Meter Circuit using MQ-3 Sensor Module

PIR Sensor Datasheet, Pinout Specifications, Working

PIR Sensor internal composition, layout and configuration

In this post we are going to explore the datasheet of PIR or Pyroelectric Infrared Radial Sensor HC-SR501. We will understand for what purpose PIR sensor is used? Its basic trigger operations, pin connection details, technical specifications and finally we will be looking at some real life applications. We will begin by understanding the actual … Read morePIR Sensor Datasheet, Pinout Specifications, Working

3 Simple Proximity Sensor Circuits

Three useful proximity sensor concepts are explained here, the first concept is based on an ordinary opamp LM358, the second one using IC LM567 which functions with a phase locked loop principle ensuring very accurate response for the detection. The third circuit works using the ubiquitous IC 555. Let’s learn each one with a step … Read more3 Simple Proximity Sensor Circuits

Using TSOP17XX Sensors with Customized Frequencies

We know that the center or band-pass operating frequency of a TSOP17XX IR sensor is assigned to a particular frequency which makes it difficult to use these sensors for designing unique or customized frequency based remote control circuits. In this post we will try to figure out an idea for enabling these sensors to work … Read moreUsing TSOP17XX Sensors with Customized Frequencies

Introduction to RGB Colour sensor TCS3200

In this post we are going to take a look at RGB color sensor TCS3200, we will understand how the color sensor works and we will be practically testing the TCS3200 sensor with Arduino and extract some useful data. Importance of Color Recognition We see the world every day, filled with rich colors, have you … Read moreIntroduction to RGB Colour sensor TCS3200

High Current Sensorless BLDC Motor Controller using Back EMF

High current sensorless BLDC controller using IC ML4425

In this post we discuss a high current sensorless BLDC motor controller circuit which does not depend on hall effect sensors for initiating the operations rather utilizes the back EMF from the motor for the sequential input Overview For proper commutation most 3-phase BLDC driver circuits rely either on a sensor based feedback or from … Read moreHigh Current Sensorless BLDC Motor Controller using Back EMF

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