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”
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Laser Audio Transmitter
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”
Arduino UNO based fingerprint sensor interface
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”
NOAA image reception using RTL SDR
An attempt to receive and decode NOAA images using the EZCAP DVB basically a RF tuner with rtl2382u tuner chip. NOAA satellites are transmitting images on following frequencies
NOAA 15 – 137.620 MHz Continue reading “NOAA image reception using RTL SDR”