Circuit Lake

Electronic Project and Circuit Collection

Measurement


Low-Cost PC Oscilloscope for Hobbyist

March 20, 2013 By: admin Category: Measurement, Software, USB No Comments →

This project shows you how to build simple and inexpensive PC-based Oscilloscope that has sufficient feature for hobbyist and student. Built based on Picaxe 28X1, the scope measure frequency up to 150 kHz (better than soundcard oscilloscope). It has digital sample rate 1 MHz (1 million samples per second) and maximum voltage range is -15 […]

Arduino Motorcycle Control Panel

February 18, 2013 By: admin Category: Arduino, Measurement No Comments →

This motorcycle control panel is built based on Arduino. It works as motorcycle speedometer, tachometer and gear indicator. It read pulses from bike’s tachometer circuit and reed switch senses wheel rotation. At each wheel pass it calculates wheel speed in RPM and then divides that into the most recent engine RPM. The ratio is unique […]

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 […]

LiPo Internal Resistance Meter, AVR ATmega8

February 10, 2013 By: admin Category: AVR, Measurement No Comments →

This ATmega8-based device can be used to measure the internal resistance of Lithium Polymer (LiPo) batteries used in electric RC models. By measure the internal resistance you can estimate your battery age and condition, whether the lipo is still good enough to power your RC model or you need to find new battery. New LiPo […]