Lie Detector and Biofeedback Arduino Based

This tutorial will explain how to build a machine for biofeedback. But first a bit of theory.

What is biofeedback?

Lie Detector and Biofeedback Arduino Based

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Biofeedback is the process of gaining greater awareness of many physiological functions primarily using instruments that provide information on the activity of those same systems, with a goal of being able to manipulate them at will. Some of the processes that can be controlled include brainwaves, muscle tone, skin conductance, heart rate and painperception.
Biofeedback may be used to improve health, performance, and the physiological changes that often occur in conjunction with changes to thoughts, emotions, and behavior.

Step 1: List of Materials

Let’s start with the list of materials needed:

Arduino / Genuino UNO X 1

Breadboard X 1

5V LCD 16 char or (5V I2C 16 LCD) X 1

Temperature sensor TMP36 X 1

220k Ohm resistor

Trimmer for the LCD contrast

Two plates of copper or conductive metal

Some jumper connection cables

This is a kit with many of components.

Step 2: Mount the LCD Screen

First we begin to build the electronic circuit on breaboard. We put all the components starting from the LCD.

We pay attention to where we insert the display on the breadboard.

This kind of LCD work on 5V with 16 columns and 2 rows. You can also use this module with keypad.

Follow the image to link the 10 pin to VCC, GROUND, POTENTIOMETER and 6 Arduino pin.

When you have connected the LCD to the Arduino board try to this LCD Example sketch and see the result. Go to and download the sketch.

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Step 3: Mount Sensors

Ok now you can mount the sensors. The TMP36 have 3 pin. Two for alimentation VCC and GND, and une for measurement. You can put the VCC pin and GND pin on the breadboard’s VCC-GND pin. After put the measurement pin on the Arduino’s A1 pin.

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