This reference design is applicable to GSR measurement and other AC impedance measurements.
With a mobile device for Android that is free to download, a user can monitor his or her skin resistance and temperature within 20m through the Bluetooth low-energy (BLE) wireless interface. This design is powered by LIR2032 rechargeable coin battery. 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.
Pic10f series microcontroller based Project List of PDF.Pic16f72 microcontroller based Project List of PDF.PIC32 microcontroller based Projects List of PDF.Pic18f452 microcontroller based projects list PDF.Pic18f4550 microcontroller based projects List PDF.Pic16f877 based projects – PIC Microcontroller PDF Downloadable.Proteus based Pic Microcontroller Projects pdf.Pic10f series microcontroller based Project List.Pic18f452 microcontroller based projects.Pic18f4550 microcontroller based projects.Pic16f877a microcontroller based projects list.The galvanic skin response is a component of the orientation reaction, that is, the response to unexpected change characterizing the processes leading to any kind of new action. The central structures responsible for the galvanic skin response are found in the reticular formation of the mesencephalon and hypothalamus and are activated by the higher sections of the brain (chiefly the limbic system-the most important part of the brain’s emotional apparatus). This activity is induced by nervous impulses proceeding from the central nervous system through the sympathetic fibers. The galvanic skin response is a negative shift of biopotential or a decrease in electrocutaneous resistance caused by the activity of the sweat glands just before perspiration. Galvanic skin response is usually recorded by measuring the indexes between the palmar and dorsal surfaces of the hand or between the palmar surfaces of both hands. Psychogalvanic reflex, a change in potential difference or electric resistance between two points on the skin in response to various stimuli or emotional excitement first described by the Russian physiologist I.