The Stress Meter
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21-02-2009, 11:05 PM


This Stress meter allows you access your emotional pain.If the stress is very high,it gives visual indication through LED display along with a warning beep.

Principle :It is based on the principle that the resistance of the skin varies in accordance with your emotional states. Resistance varies inverse proportional to the stress. Ie if the stress level is high the skin offers less resistance,and if relaxed resistance is high.
This property of the skin is used to measure the stress level.The touch pads of the stress meter sense the voltage variations across the touch pads and convey the same to the circuit.The circuit is very sensitive and detects even a minute voltage variation across the touch pads.


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23-08-2013, 03:53 PM

STRESS METER


.doc   STRESS METER.doc (Size: 688 KB / Downloads: 22)

ABSTRACT

Stress is a term that refers to the sum of the physical, mental, and emotional strains or tensions on a person. Feelings of stress in humans result from interactions between persons and their environment that are perceived as straining or exceeding their adaptive capacities and threatening their well-being. The element of perception indicates that human stress responses reflect differences in personality as well as differences in physical strength or health.
This Stress meter allows to assess one’s emotional pain. If the stress is very high, it gives visual indication through LED display along with a warning yellow light.
Stress meter is based on the principle that the resistance of the skin varies in accordance with your emotional states. Resistance varies inversely proportional to the stress. If the stress level is high the skin offers less resistance, and if relaxed, resistance is high.
In an article “Stress and Mind Control”, 21/03/2008, Roberto Bonomi stated that “When we speak of the fabulous relaxation capacity that mind control gives us, the first thing that comes to our mind, is that we will be able to take off, the excesses of nervous tension, the stress; and this is a great benefit. Because suppose that you could measure stress in inches, and that you have stress zero when the meter is located in zero.” Based on this our project and implimentation is aimed to give a visual indication of one’s stress through a light-emitting diode display along with a warning light.

INTRODUCTION

STRESS METER


Stress is the very common condition of every human being. Stress is nothing more than a socially acceptable form of mental illness. This Stress meter allows to assess the emotional pain. If the stress is very high, it gives visual indication on a LED display along with a warning light. Stress meter is based on the principle that the resistance of the skin varies in accordance with your emotional states. Resistance varies inversely proportional to the stress. If the stress level is high the skin offers less resistance, and if relaxed resistance is high.
The low resistance of the skin during high stress is due to an increase in the blood supply to the skin. This increases the permeability of the skin and hence the conductivity for electric current. This property of the skin is used here to measure the stress level. Using suitable circuitry we can convert the amount of stress a human being feels to a varying analog voltage.
The LM3915 is a monolithic integrated circuit that senses analog voltage levels and drives ten LED’s, LCD’s or vacuum fluorescent displays, providing a logarithmic 3dB/step analog display.

EVOLUTION

In an article “Stress and Mind Control”, 21/03/2008, Roberto Bonomi stated that “When we speak of the fabulous relaxation capacity that mind control gives us, the first thing that comes to our mind, is that we will be able to take off, the excesses of nervous tension, the stress; and this is a great benefit. Because suppose that you could measure stress in inches, and that you have stress zero when the meter is located in zero.”
Based on this, our project and implimentation is aimed to give a visual indication of one’s stress through a light-emitting diode display along with a warning yellow light.

PURPOSE OF THE PROJECT

The purpose of stress meter is to assess the emotional pain of human being. The stress can cause hair to fall, acne to break out and many other problems. These manifestations of stress can cause even more anxiety. Stress causes cortical levels to increase within the body, which increases oil production, which causes acne breakouts.
So this stress meter is to solve all the problems caused due to stress by checking the stress of an individual and taking care before any serious problem occurs.

BLOCK DIAGRAM DESCRIPTION:

The 230 volts ac power supply is given to the transformer. The transformer steps down the input voltage line and isolates the power supply from the power line. A full wave bridge rectifier circuit along with a voltage regulator is used to give a regulated power supply to the circuit .The input touch pads are used to sense the resistance of our skin and this input is fed to the dot/bar display driver.
The dot/bar display driver accepts the input through the touch pads which sense the small change in resistance the dot/bar driver gives the output stress level indication according the input. The output is indicated on a led display .The ten led’s act like the stress level indicators form zero stress level to high stress level on a scale of ten. The high stress detected from the dot/ bar display driver is indicated through a warning yellow light.

APPLICATION:

Each LED in stress meter operates with a 3dB difference from the previous one, and a jumper is provided to allow dot or bar mode. This project and implimentation is an essential part of the expandable analyzer and one meter circuit is used for each frequency band. There are many other uses for a simple LED meter. They are ideal as power meters on amplifiers, can be used with mixers (including the high quality mixer), preamps and any other application where it is important to know the signal level.

Design Considerations:

These devices contain no electronics, and require external circuitry to produce an audible tone.  Presence of the feedback tab enables the designer to simplify the drive circuit.  Voltage applied to the device produces mechanical distortions which are usable, among other applications, in alarms and sensors.

Design Parameters:

Never an LED should be connected directly to a battery or power supply. It will be destroyed almost instantly because too much current will pass through and burn it out. An LED must have a resistor connected in series to limit the current through the LED; otherwise it will burn out almost instantly and try to avoid connecting them in parallel.

REGULATED POWER SUPPLY:

In a typical linear power supply, AC line voltage is first down-converted to a smaller peak voltage using a transformer which is then rectified using a full wave bridge rectifier circuit. A capacitor filter is then used to smoothen the obtained sinusoidal signal. The residual periodic variation or ripple in this filtered signal is eliminated using an active regulator.

CONCLUSION

SUMMARY:


In this project and implimentation, is proposed a stress meter that indicates the stress level of a human being based on one’s skin resistance on a scale of ten. The circuit uses the IC LM3915 which is a dot/bar display driver which can easily drive ten led’s with a suggested input voltage.
The touch pad which is a piezoelectric substance senses the skin resistance when touched with a finger and acts like the input to the circuit. The output stress level is indicated on the led display. The high stress level is indicated by a warning yellow light.
The regulated power supply used in the project and implimentation gives an input voltage of 5V for the circuit to operate. A switch is used to ON/OFF the circuit.
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