electronics diy stuff
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”
Arduino provides very simple approach for many interfaces. This is a beginner’s tutorial of testing a robotic arm with arduino board and driver IC. As arduino itself cannot deliver the required current to motors a driver is required. The robotic arm in this experiment uses DC gear motors that can be easily drive using the well-known L293D driver. L293D is basically a quadruple Continue reading “Testing Robotic Arm motor with Arduino + L293D”
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”
Looking for some analog circuits to make i got this circuit of laser based audio transmitter on efy website. Giving it a try I decided to build one from the parts lying around. It uses a common 741 and LM386 ICs. Only schematic is available so created a layout for both transmitter and receiver. i have used signal from mobile jack instead of using microphone. Continue reading “Laser Audio Transmitter”
