HS-S71-L Resistive Film Pressure Sensor

1. Introduction

A resistive thin-film pressure sensor is a device that detects pressure based on the principle of resistance change.Based on the piezoresistive effect: When pressure is applied to the surface of the sensor, the sensitive layer's thin film material undergoes mechanical deformation (compression or tension), causing a change in the internal conductive pathway structure of the material (such as changes in the spacing of conductive particles, thin film lattice distortion), thereby causing a corresponding change in resistance.By measuring the change in resistance value, the size of the pressure can be calculated.

2. Schematic

Resistive thin film pressure sensor-HS-S71-L schematicClick to view

Module Parameters

• Power Supply Voltage: 3.3V / 5V

• Connection method: PH2.0 3P terminal

• Installation method: Lego assembly

4, Circuit Board Size

5 of Arduino IDE example program

Attention: If prompted with an error message about the library file during program upload, please import the library file first!
Arduino IDE Library Download and Import Tutorial:Click to view

Example program (UNO development board):

void setup(){
  pinMode(2, INPUT);
  pinMode(3, OUTPUT);
}

void loop(){
  if (digitalRead(2) == LOW) {
    digitalWrite(3,HIGH);

  } else {
    digitalWrite(3,LOW);

  }

}

6, ESP32 Python Example (for Mixly IDE/Misashi)

Choose the development board Python ESP32 [ESP32 Generic(4MB)] and upload in code mode

Attention: If prompted with an error message about the library file during program upload, please import the library file first!
Download and import tutorial for Mixly IDE ESP32 library:Click to view

Example program (ESP32-Python):

import machine

pin4 = machine.Pin(4, machine.Pin.IN)
pin12 = machine.Pin(12, machine.Pin.OUT)
while True:
    if pin4.value() == 0:
        pin12.value(1)
    else:
        pin12.value(0)

7, Mixly example program (graphical language)

Example program (UNO development board):Click to download
Attention: If prompted with an error message about the library file during program upload, please import the library file first!
Download and import tutorial of Mixly IDE Arduino library:Click to view

Example Program (ESP32 Development Board):Click to download
Attention: If prompted with an error message about the library file during program upload, please import the library file first!
Download and import tutorial for Mixly IDE ESP32 library:Click to view

8. Setting up the Test Environment

Arduino UNO Test Environment Setup

Prepare Components:

• HELLO STEM UNO R3 PRO DEVELOPMENT BOARD *1

• R3P expansion board *1

• USB TYPE-C DATA CABLE *1

• Pressure sensor (HS-S71-L) *1

• LED lamp module (HS-F08L) *1

• PH2.0 3P double-ended terminal line *2 or PH2.0 3P connector to DuPont wire *2

Circuit wiring diagram:

ESP32 Test Environment Setup

Prepare Components:Pending update...

Circuit wiring diagram:Pending update...

9, Video tutorial

Video tutorial:Click to view

10, Test results

Arduino UNO test results:

After the device is connected to the wire, burn the above program to the UNO-R3 PRO development board and then connect the power supply.When the pressure sensor detects pressure, the LED light turns on, otherwise it will turn off.

ESP32 Test Results:

Pending update...