Abstract
This article deals with the implementation of wireless data transfer in biomedical applications concretely in photoplethysmography and pressure wave measurements. It deals with the application of a Bluetooth module for data transfer to the computer where further signal processing can be performed. The work describes a use of microcontroller serving for data flow control, communication and analog signal digitalization.
Highlights
This article deals with design and realization of photoplethysmographic device serving for pulse wave investigation based on principle reflective photoplethysmography and with design of device prototype serving for pressure pulse wave measurements
The article is focused on data transfer to PC using selected microcontroller with integrated A/D converter and on the application of Bluetooth module serving for wireless data transfer
After enabling of analog to digital converter (ADC) (ADEN bit is set to the logical one) the function for conversion can be periodically called in a main loop of the program
Summary
This article deals with design and realization of photoplethysmographic device serving for pulse wave investigation based on principle reflective photoplethysmography and with design of device prototype serving for pressure pulse wave measurements. The work describes sensor and hardware design, functionality principle, digitalization and data transfer using a Bluetooth module. The article is focused on data transfer to PC using selected microcontroller with integrated A/D converter and on the application of Bluetooth module serving for wireless data transfer. Photoelectric detectors can be used for measurement. They detect either passing (transmission through tissue) or reflecting wave (reflection from tissue). Recorded pulse wave (see Fig. 3.) is similar to pressure wave curve [2]. Sensor was created from phototransistor and IR (infrared) diode (Fig. 1). Sensor is based on principle of radiation reflection
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