Design of GSM intelligent express cabinet based on 51 single chip microcomputer

1. Hardware Solution

This design is based on the express container simulation design of STC89C52 single-chip microcomputer GSM SMS verification code. The device is mainly composed of single-chip microcomputer, power module, relay circuit, LED light alarm module, control module, GSM module, keyboard module, LCD display module, mechanical switch, etc. With the help of mature GSM mobile network, when the cargo cabinet detects the existence of express delivery, it will automatically send the verification code to the user's mobile phone, truly realizing long-distance and high-efficiency information transmission.

It is mainly designed by 51 single chip microcomputer + LCD1602 liquid crystal + GSM module + button + relay; as shown in the figure:

2. Design function

(1) LCD1602 is used to display the current status of the express cabinet.

(2) There are numeric keys (0-6) for entering the SMS verification code to open the locker.

(3) After the courier deposits the goods into the cabinet, a random verification code can be sent to the designated person through the GSM module.

(4) The verification code becomes invalid after the locker is successfully opened.

3. Design Schematic

The schematic diagram is mainly designed using AD software, as shown in the figure:

4. Software Design

Main program source code

void main (void)

{    

unsigned char i;

Init_Timer0(); //Timer 0 initialization

UART_Init(); 

P1=0xff;           

LCD_Init(); //Initialize LCD

DelayMs(20); //Delay helps to stabilize

LCD_Clear(); 

sprintf(displaytemp,"AutomaticMachine");//Print input interface

LCD_Write_String(0,0,displaytemp);//Display the first line

sprintf(displaytemp,"____ pass word"); //Print input value to prompt the motor to confirm

LCD_Write_String(0,1,displaytemp);//Display the second line

LED = 0;

for(i=0;i<20;i++) // short delay gsm stabilization

{DelayMs(50);}

// SendStr("ready ok!",9);

RELAY=1;

LED=1;

while(1) //main loop

{

KeyScanDeal();

if(KEYFAS==0) //key pressed

{

DelayMs(20); //eliminate jitter

if(KEYFAS==0)

{

while(KEYFAS==0); //Press the key to send the verification code

SendMsg=TRUE; //Send message set

}

}

if(SendMsg==TRUE)

{

LED = 0;

SendMsg=FALSE; //Send message set to cancel

SendStr("AT+CMGF=1rn",11); //Set character

for(i=0;i<20;i++) //delay

{DelayMs(50);}

SendStr("AT+CSCS="GSM"rn",15); //Set gsm format

for(i=0;i<20;i++) //delay

{DelayMs(50);}

SendStr("AT+CMGS="+8618799697649"rn",26);//You can modify the first phone number of the mobile phone receiving the message here

for(i=0;i<2;i++) //delay

{DelayMs(50);}

SendStr("The PW :",8); //You can modify the information here, 9 represents the number of bytes

if(PwCount==0)

{remempw[0]=pw01[0];remempw[1]=pw01[1];remempw[2]=pw01[2];remempw[3]=pw01[3];} //Record the number sent

else if(PwCount==1)

{remempw[0]=pw02[0];remempw[1]=pw02[1];remempw[2]=pw02[2];remempw[3]=pw02[3];} //Record the number sent

else if(PwCount==2)

{remempw[0]=pw03[0];remempw[1]=pw03[1];remempw[2]=pw03[2];remempw[3]=pw03[3];} //Record the number sent

else if(PwCount==3)

{remempw[0]=pw04[0];remempw[1]=pw04[1];remempw[2]=pw04[2];remempw[3]=pw04[3];} //Record the number sent

else if(PwCount==4)

{remempw[0]=pw05[0];remempw[1]=pw05[1];remempw[2]=pw05[2];remempw[3]=pw05[3];} //Record the number sent

else if(PwCount==5)

{remempw[0]=pw06[0];remempw[1]=pw06[1];remempw[2]=pw06[2];remempw[3]=pw06[3];} //Record the number sent

else if(PwCount==6)

{remempw[0]=pw07[0];remempw[1]=pw07[1];remempw[2]=pw07[2];remempw[3]=pw07[3];} //Record the number sent

SendStr(remempw,4);

for(i=0;i<2;i++) //delay

{DelayMs(50);}

SendByte(0x1a);

for(i=0;i<20;i++) //delay

{DelayMs(50);}

// SendStr("AT+CMGS="+8618119677903"rn",26);//You can modify the number of the mobile phone receiving the message here. The second mobile phone number

// for(i=0;i<2;i++) //delay

// {DelayMs(50);}

// SendStr("The PW :",8); //You can modify the information here, 9 represents the number of bytes

// SendStr(remempw,4);

// for(i=0;i<2;i++) //delay

// {DelayMs(50);}

// SendByte(0x1a);

// for(i=0;i<20;i++) //delay

// {DelayMs(50);}

LED=1;

}

}

}