Day: June 7, 2020

Alcohol Breathalyzer circuit using 8051 microcontroller (AT89S51)

Introduction:- This article is about a breathalyzer circuit using 8051 microcontroller which outputs the blood alcohol content (BAC) from the breath. The BAC is displayed in percentage on a 3 digit seven segment display. The microcontroller used if AT89S51 which belongs to the 8051 family and the alcohol sensor is MQ135 gas sensor from Futurelec. …

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Object counter using 8051 microcontroller

Introduction:- This article is about a simple object counter/visitor counter using 8051 microcontroller . AT89S51 belonging to the 8051 family is the microcontroller used here. This circuit can count the number of objects passing across a line , number of persons passing through a gate/door and so on. The can be simply divided into two …

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Induction motor speed control

Introduction Induction motors are the workhorse of the industry because of their low cost and rugged construction. These motors can be classified into different types, based on the no of phases they can be classified as single-phase induction motor and three-phase induction motors. Based on the rotor construction the can be classified as slip ring/wound …

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