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심박 측정 ECG/GSR 센서 모듈 -AS7030B
(ECG/GSR CLICK)
개요
- 본 제품은 심박 측정 ECG/GSR 센서 모듈 -AS7030B입니다.
- 광혈류 측정 및 심박 측정 기반의 생체신호 센서 AS7030B 칩을 기반으로 디자인된 제품입니다.
- 피부의 전기적 저항을 측정이 가능하여 거짓말탐지 등의 어플리케이션에 사용 또한 가능합니다.
특징
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Type Biometrics Applications Can be used for medical remote diagnostic equipment applications, such as disposable patches used for blood oxygen saturation (SpO2) and electrocardiogram (ECG) measurement. On-board modules AS7030B - vital sign sensor based on Photoplethysmography (PPG) and Electrocardiogram (ECG) operations from AMS-AG Key Features Low-noise analog front end, synchronized PPG, ECG and GSR acquisition, blood pressure measurements, good HRM quality, temperature sensing using NTC, long operating period, and more. Interface I2C Compatibility mikroBUS Click board size L (57.15 x 25.4 mm) Input Voltage 3.3V or 5V -
ECG/GSR Click as its foundation uses the AS7030B, a vital sign sensor based on Photoplethysmography (PPG) and Electrocardiogram (ECG) operations from AMS-AG. These two popular methods are suitable for heart rate monitoring (HRM) and heart rate variability (HRV), which measure the pulse rate by sampling light modulated by blood vessels that expand and contract as blood pulses through them. The ECG is the reference for any measurement of the biopotential generated by the heart.
This vital sign sensor features a low noise analog front end, a single device integrated optical solution, and a synchronous demodulator. It consists of two 527nm green LEDs and one 940nm IR LED. The built-in infrared emitter and dedicated photodiode enable easy integration of proximity function. Besides the HRM and SpO2, the AS7030B is also an optical measurement system for GSR (galvanic skin resistivity) and skin temperature obtained via an external temperature sensor connected to an onboard header labeled as NTC.
ECG/GSR Click communicates with MCU using the standard I2C 2-Wire interface that supports Standard-Mode (100 kHz) and Fast-Mode (400 kHz) operation. Also, it uses two additional pins, the INT pin of the mikroBUS™ socket, used as an interrupt, and the EN pin, routed on the CS pin of the mikroBUS™ socket, used to put the AS7030B into Normal operation mode or in a Shutdown. The AS7030B does not require a specific Power-Up sequence but requires a supply voltage of 3.8V to work correctly. Therefore, the Click board™ uses a low dropout linear regulator AP7331 from Diodes Incorporated, providing a 3.8V out of 5V mikroBUS™ rail.
This Click board™ consists of two input channels routed to the 3.5mm jack connectors labeled as ECG and GSR, to which a 1m long ECG/EMG cable connects the electrodes to the appropriate Click board™ securely. The two electrode holders consist of a metal piece with a dent in the middle that perfectly fits the rivets on the electrodes. The contact with the measurement Click board™ remains good and secure while mounting the cable's electrodes is simple and easy.
This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the I2C communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.
