Product Description

Arduino Lie Detector Kit

- Precise data

- Serial communication

- More compact size

- Broader range of applications

You may have heard of the lie detectors used by the police during interrogations; today, we are going to build one ourselves. First, it is important to note a key fact about lie detectors: the test itself cannot definitively tell whether a person is lying or telling the truth. This is a crucial point. So, how can we interpret the results? Lie detectors primarily measure physiological responses—the body’s reactions—which differ depending on whether a person is telling the truth or lying (for instance, when answering a straightforward question like "What is your name?"). Sensors are used to track data such as breathing rate, pulse, blood pressure, and perspiration.

When a person lies, physiological changes—such as an increased breathing rate, elevated pulse, higher blood pressure, and greater perspiration—may occur. This kit utilizes an SHT20 sensor to measure temperature and skin moisture (sweat), along with a pulse sensor to monitor heart rate. An Arduino board is used for data acquisition, waveform generation, and analysis.

Product Display

Product parameters

Module Pin Wiring Diagram

SH T 20-pin	Arduino Uno pins
vcc	3.3V
GND	GND
SDA	A4
SCL	A5

Pulse Sensor Pins	Arduino Uno pins
Positive electrode +	5V
Negative electrode -	GND
SIG	A3

Free Code Resources Giveaway

FNRV9C4JPIO1CDO

PulseSensor Amped Arduino-master

FXASAGTJPIO1C77

Product Information

Supply voltage: 1.5V–3.6V	Communication interface: I2C
Humidity measurement range: 0–100% RH	Temperature measurement range: -40°C to 105°C
Humidity accuracy range: 10%–95% RH	Temperature accuracy range: ±0.3°C
Response time: 5 s	Measurement time: 50ms
Maximum power consumption: 2.7 µW	Annual drift: -0.5% RH/year

Note: Do not reverse the positive and negative power supply connections; doing so may damage the module.

Waveform of a normal heart rate state in the absence of lying

Waveform of the state during lying

                                           Temperature

                                                                      Humidity

                                                       

                                                                                                               Raw pulse data

                                                                        Heart rate

Packing List

Jumper wires x7                             

UNO development board x1                                                                     

                    Strap x1

Pulse sensor x1                     

SHT20 sensor x1