sms control systemtents

SMS CONTROLLED DEVICE

CHAPTER 1

INTRODUCTION

SMS Controlled Device is a circuit that lets you operate your home appliances like lights and water pumps from your office or any other remote places. So if you forgot to switch off the lights or other appliances while going out, it helps you to turn off the appliances with your cell phone. Your cell phone works as the remote control for your home appliances. You can control the desired appliances by sending the corresponding SMS. The system also helps let you know the relay status.

“GSM based Control System” implements the emerging applications of the GSMtechnology. Using GSM networks, a control system has been proposed that will act as an embedded system which can monitor and control appliances and other devices locally using built-in input and output peripherals.Remotely the system allows the user to effectively monitor and control the house/office appliances and equipments via the mobile phone set by sending commands in the form of SMS messages and receiving the appliances status.

It comprises of PIC 16F876A micro controller, 16X2 LCD, ULN 2003 relay driver, GSM Modem, 3 relays, 3 switches for operating the relay manually and a power system is also incorporated to power the relay driver.

For controlling the three relays we require six coded words :

R1: Relay 1 ONR2: Relay 2 ONR3: Relay 3 ON

r1: Relay 1 OFFr2: Relay 2 OFFr3: Relay 3 OFF

This coded words are send by SMS from a GSM phone to a GSM module which is incorporated in the SMS Controlled Device Circuit. The SMS received by the GSM module is send via serial communication to the PIC 16F876A micro controller. The SMS received is temporarily stored in an array. The microcontroller checks whether the coded words are there with in the data received. If the coded words are found in the data it takes the necessary action ie, to control the relay driver which in turn control the relay.

A 16X2 LCD is also incorporated in the circuit to show the device status. The relays can also be controlled manually with switches. The relay driver is operated with the help of power system connected externally which is also being soldered in the PCB. A relay driver is used to interface the relays with the microcontroller. The inter facing is necessary because the PIC works at +5V supply and relay works at +12V.

1BTech 2014 Department of EEE


CHAPTER 2BLOCK DIAGRAM

Fig 1: Block diagram of SMS Controlled Device

In this project GSM module is used to transmit and receive message. The received message is received by PIC6F876A by serial communication. It checks whether the coded word are there within the received message. If so it perform the desired operation. The relays at the out put is interfaced to the PIC micro controller via a relay driver ULN 2003A. This is used because relay works at 12V and PIC at 5V. We can also control the relay manually with switches connected to the PIC.Status of the all relays are displayed in the LCD. Supply to PIC micro controller and relays are also incorporated in the board.



CHAPTER 3HARDWARE DESCRIPTION

3.1 CIRCUIT DIAGRAMSchematic diagram

Fig 2 schematic diagram so SMS Controlled Device



PCB DESIGN

Fig 3 PCB layout of SMS controlled Device



3.2 COMPONENTS

Main Components used are:

1) PIC 16F876A

2) Liquid Crystal Display

3) 12V Relay and ULN 2003 relay driver

4) GSM module SIM 900A

5) Push Button

3.2.1 PIC 16F876A

PIC is a family of modified Harvard architecture microcontrollers made by Microchip Technology, derived from the PIC1650 originally developed by General Instrument's Microelectronics Division. The name PIC initially referred to "Peripheral Interface Controller'" now it is "PIC'" only.made it cost less than CPUs that required a quartz "erase window" for erasing EPROM.

Core Architecture

The PIC architecture is characterized by its multiple attributes:Separate code and data spaces (Harvard architecture).A small number of fixed length instructionsMost instructions are single cycle execution (2 clock cycles, or 4 clock cycles in 8-bit models), with one delay cycle on branches and skipsOne accumulator (W0), the use of which (as source operand) is implied (i.e. is not encoded in the opcode)All RAM locations function as registers as both source and/or destination of math and other functions.A hardware stack for storing return addressesA small amount of addressable data space (32, 128, or 256 bytes, depending on the family), extended through bankingData space mapped CPU, port, and peripheral registersALU status flags are mapped into the data spaceThe program counter is also mapped into the data space and writable (this is used to implement indirect jumps).There is no distinction between memory space and register space because the RAM serves the job of both memory and registers, and the RAM is usually just referred to as the register file or simply as the registers.



Data space (RAM)

PICs have a set of registers that function as general purpose RAM. Special purpose control registers for on-chip hardware resources are also mapped into the data space. The addressability of memory varies depending on device series, and all PIC devices have some banking mechanism to extend addressing to additional memory. Later series of devices feature move instructions which can cover the whole addressable space, independent of the selected bank. In earlier devices, any register move had to be achieved via the accumulator.To implement indirect addressing, a "file select register" (FSR) and "indirect register" (INDF) are used. A register number is written to the FSR, after which reads from or writes to INDF will actually be to or from the register pointed to by FSR. Later devices extended this concept with post- and pre- increment/decrement for greater efficiency in accessing sequentially stored data. This also allows FSR to be treated almost like a stack pointer (SP).External data memory is not directly addressable except in some high pin count PIC18 devices.

Advantages

Small instruction set to learnRISC architectureBuilt in oscillator with selectable speedsEasy entry level, in circuit programming plus in circuit debugging PICKit units available for less than $50Inexpensive microcontrollersWide range of interfaces including I²C, SPI, USB, USART, A/D, programmable comparators, PWM, LIN, CAN, PSP, and Ethernet[8]Availability of processors in DIL package make them easy to handle for hobby use.

Limitations

One accumulatorRegister-bank switching is required to access the entire RAM of many devicesOperations and registers are not orthogonal; some instructions can address RAM and/or immediate constants, while others can only use the accumulatorThe following stack limitations have been addressed in the PIC18 series, but still apply to earlier cores:



PIN DIAGRAM

Fig 4 Pin diagram of PIC16F876ASPECIFICATIONOperating frequency 20MHZ

Resets(and delays) POR, BOR(PWRT, OST)

Flash Program Memory(14 bit word)

8K

Data memory(bytes)368

EEPROM256

Interrupt 14

I/O ports ports A, B, C

Capture/compare/PCOM module 2

Timers 3

Serial communication MSSP, USART10 bit analog to digital module 5 i/p channel

Analog comparator 2

Instruction set 35 instructions

Table 1 Specifications of PIC16F876A



3.2.2 16X2 LCD

LCD (Liquid Crystal Display) screen is an electronic display module and find a wide

range of applications. A 16x2 LCD display is very basic module and is very

commonly used in various devices and circuits. These modules are preferred over

seven segments and other multi segment LEDs. The reasons being: LCDs are

economical; easily programmable; have no limitation of displaying special &

even custom characters (unlike in seven segments), animations and so on.

A 16x2 LCD means it can display 16 characters per line and there are 2 such lines. In

this LCD each character is displayed in 5x7 pixel matrix. This LCD has two

registers, namely, Command and Data. The command register stores the command

instructions given to the LCD. A command is an instruction given to LCD to do a

predefined task like initializing it, clearing its screen, setting the cursor position,

controlling display etc. The data register stores the data to be displayed on the LCD.

The data is the ASCII value of the character to be displayed on the LCD. Click to

learn more about internal structure of a LCD

Fig 5 LCD



Table 2 specification of LCD



3.2.3 GSM Module

A GSM modem is a specialized type of modem which accepts a SIM card, and operates over a subscription to a mobile operator, just like a mobile phone. From the mobile operator perspective, a GSM modem looks just like a mobile phone.

When a GSM modem is connected to a computer, this allows the computer to use the GSM modem to communicate over the mobile network. While these GSM modems are most frequently used to provide mobile internet connectivity, many of them can also be used for sending and receiving SMS and MMS messages.A GSM modem can be a dedicated modem device with a serial, USB or Bluetooth connection, or it can be a mobile phone that provides GSM modem capabilities.

A GSM modem exposes an interface that allows applications such as SMS to send and receive messages over the modem interface. The mobile operator charges for this message sending and receiving as if it was performed directly on a mobile phone. To perform these tasks, a GSM modem must support an “extended AT command set” for sending/receiving SMS messages.

GSM modems can be a quick and efficient way to get started with SMS, because a special subscription to an SMS service provider is not required. In most parts of the world, GSM modems are a cost effective solution for receiving SMS messages, because the sender is paying for the message delivery This GSM Modem can accept any GSM network operator SIM card and act just like a mobile phone with its own unique phone number. Advantage of using this modem will be that you can use its RS232 port to communicate and develop embedded applications. Applications like SMS Control, data transfer, remote control and logging can be developed easily.

The modem can either be connected to PC serial port directly or to any microcontroller through MAX232. It can be used to send and receive SMS or make/receive voice calls. It can also be used in GPRS mode to connect to internet and do many applications for data logging and control. In GPRS mode you can also connect to any remote FTP server and upload files for data logging.

This GSM modem is a highly flexible plug and play quad band SIM900A GSM modem for direct and easy integration to RS232 applications. Supports features like Voice, SMS, Data/Fax, GPRS and integrated TCP/IP stack.

Applications10

BTech 2014 Department of EEE


SMS based Remote Control & Alerts Security Applications Sensor Monitoring GPRS Mode Remote Data Logging

Features

Status of Modem Indicated by LED

Simple to Use & Low Cost On board switching type power supply regulator RS232 output

PINOUT

Fig 6 pinout of GSM ModuleNetwork LED

The Network LED indicates the various status of GSM module eg. Power on, Network registration & GPRS connectivity. When the modem is powered up, this NETWORK LED will blink every second. After the Modem registers in the network (takes between 10-60 seconds), this LED will blink in step of 3 seconds at slow rate. At this stage you can start using Modem for your application,showing that modem is registered with the network.

Send and Receive SMS



For sending SMS in text Mode:AT+CMGF=1 press enterAT+CMGS=”mobile number” press enter

Once The AT commands is given’ >’ prompt will be displayed on the screen. Type the message to sent via SMS. After this, press ctrl+Z to send the SMS. If the SMS sending is successful, “ok” will be displayed along with the message number.

For reading SMS in the text mode:AT+CMGF=1 Press enterAT+CMGR= no.

Number (no.) is the message index number stored in the sim card. For new SMS, URC will be received on the screen as +CMTI: SM ‘no’. Use this number in the AT+CMGR number to read the message.

The ground terminal of the GSM module and PIC are common. The transmission pin of the GSM module is connected to the receiving pin of the PIC micro controller. likewise the receiving pin of the GSM module is connected to the transmission pin of the micro controller.

AT COMMANDS FOR SMS

AT+CSMSselect message service

AT+CMPSpreffered message storage

AT+CMGFmessage format

AT+CSCAservice centre address

AT+CSMPset text mode parameters

AT+CSPHshow text mode parameters

AT+CSCBselect cell broadcast message type

AT+CSASsave settings



AT+CRESrestore settings

AT+CNMInew message indication to TE

AT+CMGL List messages

AT+CMGR read messages

AT+CMGSsend messages

AT+CMSSsend message from storage

AT+CMGWwrite to memory

AT+CMGDdelete messages

Table 3 AT Commands for SMS

3.2.4 Push Button



Fig 7 push button

A push-button (also spelled pushbutton) or simply button is a simple switch

mechanism for controlling some aspect of a machine or a process. Buttons are

typically made out of hard material, usually plastic or metal. The surface is usually

flat or shaped to accommodate the human finger or hand, so as to be easily

depressed or pushed. Buttons are most often biased switches, though even many

un-biased buttons (due to their physical nature) require a spring to return to their

un-pushed state. Different people use different terms for the "pushing" of the

button, such as press, depress, mash, and punch

3.2.5 12V Relay and Relay Driver

12V RELAY



Fig 8 Relays

Relays are switches, the terminology applied to switches is also applied to relays; arelay switches one or more poles, each of whose contacts can be thrown by energizing the coil.

Normally SPDT switches are used. It basically consists of a coil and a SPDT switch.The relay driver is used to isolate both the controlling and the controlled device. Therelay is an electromagnetic device, which consists of solenoid, moving contacts (switch) and restoring spring and consumes comparatively large amount of power. Hence it is possible for the interface IC to drive the relay satisfactorily. To enable this, a driver circuitry, which will act as a buffer circuit, is to be incorporated between them. The driver circuitry senses the presence of a “high” level at the input and drives the relay from another voltage source. Hence the relay is used to switch the electrical supply to the appliances. From the figure when we connect the rated voltage across the coil the back emf opposes the current flow but after the short time the supplied voltage will overcome the back emf and the current flow through the coil increase. When the current is equal to the activating current of relay the core is magnetized and it attracts the moving contacts. Now the moving contact leaves from its initial position denoted “(N/C)” normally closed terminal which is a fixed terminal. The common contact or moving contact establishes theconnection with a new terminal which is indicated as a normally open terminal “(N/O)”.Whenever, the supply coil is withdrawn the magnetizing force is vanished. Now, thespring pulls the moving contact back to initial position, where it makes a connectionmakes with N/C terminal. However, it is also to be noted that at this time also a back emf is produced. The withdrawal time may be in microsecond, the back emf may be in the range of few kilovolts and in opposite polarity with the supplied terminals the voltage is known as surge voltage. It must be neutralized or else it may damage the system.

RELAY DRIVER



Fig 9 pin diagram of ULN2003A

The ULN2003AP/AFW Series are high_voltage, high_current darlington drivers comprised of seven NPN darlington pairs.All units feature integral clamp diodes for switching inductive loads. Applications include relay, hammer, lamp and display (LED) drivers.

The ULN2003 is a monolithic high voltage and high current Darlington transistor arrays. It consists of seven NPN Darlington pairs that feature high-voltage outputs with common-cathode clamp diode for switching inductive loads. The collector-current rating of a single Darlington pairs 500mA. The Darlington pairs may be paralleled for higher current capability. Applications include relay drivers, hammer drivers, lamp drivers, display drivers (LED gas Discharge), line drivers, and logic buffers. The ULN2003 has a 2.7kW series base resistor for each Darlington pair for operation directly with TTL or 5V CMOS devices.

FeaturesOutput current (single output): 500 mA (max) High sustaining voltage output: 50 V (min) Output clamp diodes Inputs compatible with various types of logic Package Type-AP: DIP-16pin Package Type-AFW: SOL-16pin

3.3 FLOW CHART


START

BAUD RATE INITIALIZATION


3.4 POWER SYSTEM


GSM MODULE INITIALIZATION

RECEIVE MESSAGE

CHECK WHETHER THE MESSAGE IS NEW

DECODE THE MESSAGE

CHECK WHETHER THE CODE IS ACCEPTABLE

RELAY 1 WHETHER ANY SWITCHING IS NEEDED



SWITCH

SWITCH

SWITCH


Fig 10 Power System

15V is supplied to the input terminal. The voltage regulator 7412 is used to

regulate the 15V supply to 12V. Here 74 represents positive voltage level and 12

represents the regulated voltages. This regulated voltage is then passed through the

voltage regulator 7405. The voltage is regulated to 5V.

CHAPTER 4INTERFACING OF COMPONENTS WITH PIC



PIC6F876A CONNECTION

Fig 11 PIC connections

Here the crystal used is of 20MHZ frequency. The MCLR pin is connected as a

voltage divider between a capacitor and a resistor. Vcc is applied to the resistor. The

capacitor charges. The pic is ON whenever the input to MCLR pin is 0 and when it

is 1 it becomes OFF state.

LCD INTERFACING WITH PIC 16F876A



Fig 12 LCD interfacing with PIC

The command to LCD are sent in the form of ASCII code to the LCD. The LCD itself contains a micro controller inside it and pin 1 and 2 are connected to the supply and ground respectively for the purpose of working of the microcontroller. Pin 15 and 16 are connected to VCC and the ground for backlight. Pin 3 is connected to 2.3 for the contrast adjustment. Here the PIC act as master and the LCD as slave

Port B is used for interfacing the PIC 16F876A with LCD. The LCD can be interfaced with PIC either as 8 bit or as 4 bit. Here in this circuit it is 4 bit. RB4, RB5, RB6, RB7 pins of PIC is connected with D4, D5, D6, D7 pins of LCD. The RS and Enable pins of LCD are connected to RB2 and RB3 pins of PIC. R/W pin is grounded. So total there are 6 i/o lines .

GSM module interfaced with PIC 16F876A



GSM module is interfaced with PIC 16F876A through serial communication. AT commands are used to control the GSM module. To control the GSM module send a message to it using AT commands with help of PIC 16F876A.GSM Modem - RS232 - SIM900A

.

Fig 13 GSM ModuleEasy interface with microcontroller/PC for Calling, SMS, Remote Control, Data

Logging, Alarm etc applications

This GSM Modem can accept any GSM network operator SIM card and act just like a mobile phone with its own unique phone number. Advantage of using this modem will be that you can use its RS232 port to communicate and develop embedded applications. Applications like SMS Control, data transfer, remote control and logging can be developed easily.



INTERFACING OF SWITCHES WITH THE PIC

Fig 14 interfacing switches with PIC

Switches are used to control the relay manually. Button type switches are used. This

connected to the port A pins of the micro controller. Here RA0, RA1, RA2 pins of

the micro controllers are connected to the switches. When the switch is pressed VCC

is grounded and the relay is turned ON. Likewise if the switch is opened the

corresponding relay is turned OFF.

INTERFACING OF RELAY AND RELAY DRIVERS22



Fig 15 interfacing of relay and relay drivers with PIC

Relay driver ULN 2003A is used to interface between relay and the micro

controller. It is necessary because relay works at 12V and the PIC works at 5V

supply. So it is necessary to have the relay driver. The relay driver is connected to

the port c pins of the PIC 16F876A. Here we are taking only 3 outputs ie, we are

only controlling 3 appliances.

The RC0, RC1, RC2 pins of the PIC is connected to the input pins I1,I2, I3 of the

relay driver. It can also be extended if necessary. Corresponding outputs from the

relay driver are taken and connected to the relays.

LEDS are connected before the relay driver. When the signal from the PIC is high

the output of ULN goes low. As a result the current starts flowing through the coil.

The coil act as a magnet and the switch changes its state from normally opened state

to normally closed state. As a result the appliance connected to the relay is ON.

Likewise, if the signals from PIC goes low the output of relay driver goes high and

the current doesn’t flow through the coil. The coil is not magnetised so the switch

remains in normally opened state. The 12V suppy to the relay driver is obtained with

the help of power supply system incorporated with in the pic.

SMS DEVICE CONTROLLER



Fig 16 SMS Device Controller

5. RESULT AND CONCLUSION24



5.1 RESULT

The circuit of our project was designed and implemented. The circuit worked as per

the desired specification given. The relays are working properly. When the supply is

given the LCD displays “ MACE” then it displays “SMS DEVICE

CONTROLER”. Then the LCD displays relay status. It displays “ r1 r2 r3”. All

relays are at OFF condition at start. LEDs are connected at the output. The LEDs

glows when the corresponding relays are ON or it doesn’t glows. This circuit is very

useful as the devices can be controlled from remote places.

5.2 CONCLUSION



The project we have undertaken has helped us gain a better perspective on various

aspects related to our course of study as well as practical knowledge of electronic

equipments and communication. We became familiar with software analysis,

designing,implementation, testing and maintenance concerned with our project.

The extensive capabilities of this system are what make it so interesting. From the

convenience of a simple cell phone, a user is able to control and monitor virtually

any electrical devices. This makes it possible for users to rest assured that their

belongings are secure and that the television and other electrical appliances was not

left running when they left the house to just list a few of the many uses of this system

.

The end product will have a simplistic design making it easy for users to interact

with This will be essential because of the wide range of technical knowledge that

homeowners have.

REFERENCE



1. www.datasheetcatalog.co m

2. http://www.engineersgarage.com – LCD 16x2 DATA SHEET

3. http://www.circuitstoday.com /

4. Microcontrollers And Applications, Satish Shah ,Oxford Publications.

5. Microcontrollers and Embedded Systems, Mohammad Ali Mazidi.

6. Microprocessors and Microcontrollers by Ayala

7. Wikipediawww.wikipedia.com

8. www.efy.com

9. POWER ELECTRONICS by Dr. P.S BIMBHARA

SOFTWARES USED

1. Cadsoft Eagle Proffessional 27


http://www.efy.com/


2. Mikroc_Pro_Pic_2011 v

3. Proteus.Proffesional.V8

APPENDIX A

PROGRAM



// LCD module connections

sbit LCD_RS at RB2_bit;

sbit LCD_EN at RB3_bit; // LCD module connections

sbit LCD_D4 at RB4_bit;




sbit LCD_RS_Direction at TRISB2_bit;

sbit LCD_EN_Direction at TRISB3_bit;

sbit LCD_D4_Direction at TRISB4_bit;




// End LCD module connections

sbit sw1 at RA0_bit;



sbit rel1 at RC0_bit;



const code char cmgs[]={"AT+CMGS="};

const code char cmgr[]={"AT+CMGR=1\r\n"};29



const code char cmgf[]={"AT+CMGF=1\r\n"};

const code char at_[]={"AT\r\n"};

const code char cmgd[]={"AT+CMGD=1\r\n"};

const code char home1[]={"9562950719"};



const code char rl1[]={"RELAY 1 "};



const code char on[]={"ON"};

const code char of[]={"OFF"};

unsigned char urt_read,ser[80],ser_p,urt_pr,cust;

unsigned char i,flag=0;

void uart_send(unsigned char dat)

{

uart1_write(dat);

delay_ms(20);

}

char* codetxt_to_ramtxt(const char* ctxt)

{

static char txt[25];30



char i;

for(i =0; txt[i] = ctxt[i]; i++);

return txt;

}

void delay(unsigned char del)

{

while(del)

{

delay_ms(100);

del--;

}

}

void interrupt()

{

if(PIR1.RCIF)

{

PIR1.RCIF=0;

urt_pr=urt_read;

urt_read=UART1_Read();

if((urt_read=='C')&&(urt_pr=='+')) ser_p=0;

if((urt_read=='1')&&(urt_pr=='R')) rel1=1;

31



if((urt_read=='1')&&(urt_pr=='r')) rel1=0;





ser[ser_p]=urt_read;

ser_p++;

if(ser_p>80)

ser_p=0;

}

}

void welcome()

{

TRISA=0x07;

ADCON1=0x06;

TRISC=0x80;

Lcd_Init(); // Initialize LCD

Lcd_Cmd(_LCD_CLEAR); // Clear display

Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off32



LCD_OUT(1,6,"MACE");

PIR1=0x00;

INTCON=0xC0;

PIE1=0x20;

UART1_Init(9600); // Initialize UART module at 9600 bps

delay_ms(10); // Wait for UART module to stabilize

uart1_write_text(codetxt_to_ramtxt(at_));

delay(15);


LCD_OUT(1,6,"SMS");

LCD_OUT(2,1,"DEVICE CONTROLER");

uart1_write_text(codetxt_to_ramtxt(cmgf));

delay(15);

uart1_write_text(codetxt_to_ramtxt(cmgd));

delay(15);


}

void send_stat1()

{

uart1_write_text(codetxt_to_ramtxt(cmgs));33



uart_send(34);

uart1_write_text(codetxt_to_ramtxt(home1));

uart_send(34);

uart_send(13);

delay(10);

uart1_write_text(codetxt_to_ramtxt(rl1));

if(rel1) uart1_write_text(codetxt_to_ramtxt(on));

else uart1_write_text(codetxt_to_ramtxt(of));

uart_send(10); uart_send(13);









uart_send(10);

uart_send(13);

delay(3);

uart_send(26);34



}

void send_stat2()

{

uart1_write_text(codetxt_to_ramtxt(cmgs));

uart_send(34);


uart_send(34);

uart_send(13);

delay(10);











else uart1_write_text(codetxt_to_ramtxt(of));35




uart_send(10);

uart_send(13);

delay(3);

uart_send(26);

}

void send_stat3()

{

uart1_write_text(codetxt_to_ramtxt(cmgs));

uart_send(34);


uart_send(34);

uart_send(13);

delay(10);






if(rel2) uart1_write_text(codetxt_to_ramtxt(on));36









uart_send(10);

uart_send(13);

delay(3);

uart_send(26);

}

void disp()

{

if(rel1==1)

LCD_OUT(2,1,"R1");

else

LCD_OUT(2,1,"r1");

if(rel2==1)

LCD_OUT(2,4,"R2");

else

LCD_OUT(2,4,"r2");

if(rel3==1)37



LCD_OUT(2,7,"R3");

else

LCD_OUT(2,7,"r3");

}

void main()

{

PORTC=0x00;

welcome();

send_stat1();

while(1)

{

disp();

if(!sw1)

{

rel1=~rel1;

delay(10);

while(!sw1);

}

if(!sw2)

{38



rel2=~rel2;

delay(10);

while(!sw2);

}

if(!sw3)

{

rel3=~rel3;

delay(10);

while(!sw3);

}

if((ser[3]=='I')&&(ser[2]=='T')&&(ser[1]=='M')&&(ser[0]=='C'))

{

for(i=0;i<75;i++)

ser[i]=0;

uart1_write_text(codetxt_to_ramtxt(cmgr));

flag=1;

delay(20);

uart1_write_text(codetxt_to_ramtxt(cmgd));

delay(15);

send_stat1();

delay(20);

send_stat2();39



delay(20);

send_stat3();

delay(20);

}

}

}


sms control systemtents

Documents