Design of Digital Respiration Rate Meter

Development of a Respiration Rate Meter –a Low-cost Design Approach

Measurement of physiological parameters like respiration rate is crucial in field of medicine. Respiration rate can indicate the state of rhythmic behaviour of heart and proper gaseous exchange in blood. As per Medical research, respiratory rate is regarded as the marker of pulmonary dysfunction. Respiration rate meters are used in measuring CO2 in expired air and in apnea detectors. It is also...

Design and Development of Microcontroller Based Digital pH Meter

A Microcontroller based digital pH meter was designed and developed to measure the value of pH (acidity or alkalinity) for any type of solution. Two op-amps of high input impedance and low output impedance were used to design the pH meter: one is used as a buffer and the other as a summing amplifier. The output of the summing amplifier is connected to the microcontroller as an input. The pH val...

Low-Frequency Digital Phase Meter

A microcomputer-controlled measuring instrument for phase angle measurement in low frequency range is described. It is based on the digital measurement of the time shift between input signals. To avoid the necessity of calculation of the measured phase shift, measurement of the time shift is repeated during a constant time interval to get the average value of the phase shift independent on the ...

Low Cost Digital Vibration Meter

This report describes the development of a low cost, digital Micro Electro Mechanical System (MEMS) vibration meter that reports an approximation to the RMS acceleration of the vibration to which the vibration meter is subjected. The major mechanical element of this vibration meter is a cantilever beam, which is on the order of 500 µm in length, with a piezoresistor deposited at its base. Vibra...

Digital Phase Meter for Multiple Heterodyne Signals