On the other hand, the microcontroller integrates all the analog front-end and other peripherals required for impedance measurements, including one 16-bit ADC with input MUX and PGA, two 12-bit DACs and two 8-bit DACs, 4 operational amplifiers (OP AMP), 4 uncommitted SPST analog switches, and internal voltage references. The TE micro USB connector is ideal for this application because of its reliability, robustness, and versatility. This design features a wellness measurement microcontroller and the TE Connectivity’s micro USB 2.0 that is used as the charging port of this device. It monitors the user’s skin impedance and temperature. This reference design is a GSR system that is worn in the wrist. The signal can be used for capturing the autonomic nerve responses as a parameter of the sweat gland function. The electro-physiological signal is generated by the sweat glands, and the sweat is the cause of the variation in resistance and conductivity.
The GSR utilizes the principle that skin property varies with the state of sweat glands. It is also known as Electrodermal Activity (EDA), Electrodermal Response (EDR), Electrodermal Level (EDL), Skin Conductance Activity (SCA), Skin Conductance Response (SCR), and a lot more. The Galvanic Skin Response (GSR) is a property of the skin to exhibit electrical characteristics.
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