Alcohol sensors are commonly available these days and a simple breath analyzer can be constructed using an Arduino board. This alcohol sensor MQ-3 has digital as well as analog out pin. For a quick implementation digital output can be used. Only a bunch of things are required for the interface..
Continue reading “Arduino Interface for Alcohol (MQ-3) Sensor”
This person counter uses infrared sensors for counting persons passing through. This project is useful for lecture rooms and conference hall where it can count the number of persons inside the hall. The logic turns on the light if there is a person inside the room else if the person count is zero lights remain off. The demonstration is made for room lights only but the application can be extended for security applications. Continue reading “Arduino based person Counter & Automatic Room Light”
Arduino helps in simple interfacing for different modules. Here is an implementation of fingerprint sensor interface with Arduino Uno board. Four push buttons are used for input. The menu on LCD guides the enrollment and scanning process. The connections for hardware are described in image. Continue reading “Arduino UNO based fingerprint sensor interface”
