Module features

1. Adopting a sensitive photoresistor sensor

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

3. Equipped with an adjustable potentiometer to adjust the brightness of the detection light

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. The photoresistor module is sensitive to ambient light and is generally used to detect the brightness of surrounding light, triggering microcontrollers or relay modules, etc;

2. When the ambient light brightness does not reach the set threshold, the DO terminal outputs a high level. When the ambient light brightness exceeds the set threshold, the DO terminal outputs a low level;

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

4. The DO output terminal can directly drive the relay module of our store, thus forming a light controlled switch.

The front and back appearance of the products in this series of modules

Product structure and wiring diagram

Public circuit diagram, friends who need it can refer to the following figure

Microcontroller testing program

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

Sensor trigger test

Single chip microcontroller: STC89C52

Baud rate: 9600

Product use: Light 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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