Circuit Lake

Electronic Project and Circuit Collection


AVR Digital Stethoscope

February 11, 2013 By: admin Category: AVR, Data Acquisition, Detector, Measurement, Microcontroller No Comments →

This digital stethoscope can be used as computer aided diagnosis (CAD) applications for the detection of cardiac murmurs. It can assist physicians in analyzing cardiac signals in real time during auscultation to reduce the risks of not detecting heart murmurs conditions. The Stethoscope system is built based on ATmega644 AVR microcontroller and custom-built sensor to […]

Room Visitor Counter

January 22, 2013 By: admin Category: Detector, Microcontroller, Monitoring No Comments →

This room visitor counter counts how many people are currently in the room. It will detect someone who enter or exit the room. When there is at least one person in the room, the relay is switched on. And vice versa, if the room is vacant, the relay is switched off. You can connect the […]

COM Port Number Detector for Serial to USB Adapter

January 17, 2013 By: admin Category: Detector, Display, PIC No Comments →

Xser is PIC18F2553-based serial to USB adapter with a small LCD display. When connected to a computer, the LCD shows the COM port number assigned to the device. This device helps you to find correct COM port for the USB adapter device without need to check it in your control panel.

Simple EMF Probe Using INA122

October 17, 2012 By: admin Category: Analog, Detector, Sensor No Comments →

This simple circuit is used to detect variations in electromagnetic fields around us. It based on an instrumentation amplifier INA122 for Texas instrument. As sensing element, the detector is equipped with Inductor (100uH-1mH). The output is routed out to oscilloscope through a BNC connector. A 9v battery is used to power the circuit.