The variable voltage level is sensed by IC1 and it gives an amplified variable output. The skin between the touch pads act as a variable resistor and the current passing through it depends on the resistance of the skin, that in turn depends on the stress level. When the touch pads make contact with the skin of first and middle fingers of left hand, current passes from pad 1 to pad 2 through the skin. The touch pads along with R1 and VR1 forms a bridge to give a variable voltage into the input of IC1 based on the conductivity of the skin. This is specially noticed in the left palm and fingers.įront end of the circuit has a voltage sensor comprising two touch pads and a signal amplifier. This makes the skin moist and electrical conductivity increases. The physiological changes in the body during high stress causes sweating and leakage of water from the blood vessels in the skin. In the relaxed state, skin offers high resistance about 2 Meg ohms or more but it reduces to 25K or less in a stressful condition. The electrical conductivity of the skin varies depending on the stress level of the body. The circuit exploits the Galvanic skin response as an indicator of stress. The circuit described here is useful to monitor the stress level before and after practicing a relaxation exercise. Many relaxation techniques are now in practice to keep the body in relaxed condition. These hormone triggered changes makes the body alert to face the situation.īut a permanent stress condition is harmful to the body and may results in many health problems. A number of physiological changes including increase in heart rate, breathing rate etc occurs during a high stress state. What is Stress? Stress is a physiological condition in which the body becomes excited to face an emergency situation.
It exploits the skin’s galvanic property to measure the stress level of the body.Įven though the circuit do not measures the stress level precisely, it can be used as an indicator to know the stress level. However, it requires more attention to respondent compliance, and a potential need to recruit larger than what the need would be in a controlled lab environment.This relaxation and stress monitor circuit tells you that whether your body is relaxed or not.
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