Purpose

Temperature detection, temperature control sensor, environmental temperature detection

Module features

1. Adopting NTC thermistor sensor with good sensitivity

2. The comparator output has a clean signal, good waveform, and strong driving capability, exceeding 15mA.

3. Adjust the temperature detection threshold with a potentiometer

4. Working voltage 3.3V-5V

5. Output format: Digital switch output (0 and 1)

6. Equipped with fixed bolt holes for easy installation

7. Small PCB size: 3.2cm x 1.4cm

8. Using a wide voltage LM393 comparator

Module usage instructions

1. Thermistor modules are highly sensitive to environmental temperature and are generally used to detect the temperature of the surrounding environment;

2. By adjusting the potentiometer, the temperature detection threshold (i.e., the control temperature value) can be changed. If it is necessary to control the ambient temperature to 50 degrees, the module will turn on the green light when the corresponding ambient temperature is adjusted, and the DO will output a high level. When the temperature is lower than this set value, the module will output a high level and the green light will not turn on;

3. The DO output terminal can be directly connected to the microcontroller to detect high and low levels, thereby detecting temperature changes in the environment;

4. The DO output terminal can directly drive the relay module of our store, which can form a temperature control switch to control the working temperature of related equipment, and can also be connected to a fan for heat dissipation, etc;

5. The temperature detection range of this module is 20-80 degrees Celsius;

6. This module can also be replaced with a wired temperature sensor for controlling water temperature, water tank, etc.

Microcontroller testing program

/******************************************

Sensor trigger test

Single chip microcontroller: STC89C52

Baud rate: 9600

Product use: Temperature detection.

*****************************************/

#include <reg52.h>

unsigned char date;

#define uchar unsigned char

#define uint unsigned int

sbit key1=P0^1;

/*Function declaration-----------------------------------------------*/

void delay(uint z);

void Initial_com(void);

//***********************************************************

/*

********************************************************************************

**Function name: delay (uint z)

**Function Function: Delay Function

********************************************************************************

*/

void delay(uint z)

{

uint i,j;

for(i=z;i>0;i--)

for(j=110;j>0;j--);

}

//******************************

//*****Serial port initialization function***********

//******************************

void Initial_com(void)

{

EA=1; // Total Interruption

ES=1; // Allow serial port interruption

ET1=1; // Allow interrupt of timer T1

TMOD=0x20; // Timer T1, interrupt in Mode 2 to generate baud rate

PCON=0x00; // SMOD=0

SCON=0x50; // Method 1: Controlled by Timer

TH1=0xfd; // Set the baud rate to 9600

TL1=0xfd;

TR1=1; // Start timer T1 and run control bit

}

//*************************

//**********Main function*********

//*************************

main()

{

Initial_com();

while(1)

{

if(key1==0)

{

delay(); // Eliminate jitter

If (key1==0)//Confirm triggering

{

SBUF=0X01;

delay(200);

}

}

if(RI)

{

date=SBUF; // Single chip microcontroller accepts

SBUF=date; // Single chip microcontroller sending

RI=0;

}

}

}

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