SMS controlled land rover

[SOUBHIK KUMAR DEY]

Dear Sir,

I want to design a sms controlled Robot that can be controlled via AT commands using SIM300 / SIM900 and AVR Atmega8 MCU. Plz sir I need all the steps in detail including ckt diagram, PCB diagram, circuit components required and programming for AVR.

I stumbled upon a video on YouTube which resembles exactly the robot I want to design. You can search “SIM 300 GSM_GPRS Modem based SMS Controlled Robot” in Search field. I am not giving the direct link coz ur site flags my post as spam.

Plz Sir help me. Also can a Nokia/Samsung phone replace the SIM300? Plz sir, its urgent 4 my college project.

Thnx n Regeads,

Soubhik.

[SOUBHIK KUMAR DEY]

Thank u sir for your kind help. Thank you very much.

But Sir, I could not get what is RST terminal at the top. And where should I connect the SIM900 module to interpret the SMS Commands. Also the chip MT8770 is used as DTMF decoder. Is it really necessary? and what should I feed into it.

Plz Sir help me. I cannot get hoe to connect the SIM900 module and make it interpret my sms commands like suppose, sending ‘1’ means ON n ‘0’ means OFF. Also can u plz giv me the link to the code on your site.

Thank You Sir very much.

Soubhik.

 

 

[SOUBHIK KUMAR DEY]

Thank you sir.

Sir, I just need the circuit connections for SIM900 module to interpret my sms commands (AT

Command concept) like if I send ‘1’ via sms, it would send an ON or HIGH SIGNAL, and if I send

‘0’ it would send an OFF or LOW SIGNAL. I cannot get how to make the circuit so as to make the

SIM900 interpret the SMS commands so as to send HIGH or LOW signal to the AVR microcontroller.

I am stressing on AVR because I already have an AVR development board. But you may suggest

help with 8051.

I am not having any problem with programming or AVR. My problem is how to make my sim900

interpret the sms commands and send HIGH or LOW SIGNALS accordingly to AVR. Rest is okay for

me.

Thank You sir very much.

Soubhik.

[SOUBHIK KUMAR DEY]

My robot shall move according to the sms I send. It’s steering is based on Differential drive.

It has 4 motors (2 on each side parallely connected). The robot will perform the following

action based on sms sent. The SMS shall be a 2-digit no. consisting of only ‘0’ or ‘1’. The

1st digit controls 4 left side & 2nd digit controls right side.

SMS         ACTION

11              FORWARD

01              LEFT

10              RIGHT

00              STOP

‘1’ should send a high signal and ‘0’ should send a low signal so that AVR Atmega 16 can

prepare the output acc to HIGH/LOW signal and send it to L293D IC.

Thank You Sir very much.

Soubhik.    

[SOUBHIK KUMAR DEY]

My robot shall move according to the sms I send. It’s steering is based on Differential drive.

It has 4 motors (2 on each side parallely connected). The robot will perform the following

action based on sms sent. The SMS shall be a 2-digit no. consisting of only ‘0’ or ‘1’. The

1st digit controls left side motors & 2nd digit controls right sidemotors.

SMS       ACTION

11           FORWARD (switches ON both side motors)

01           LEFT (switches OFF left motor OR rotates LEFT motor in OPPOSITE direction and RIGHT motor ON)

10           RIGHT (switches ON LEFT motor and RIGHT motor OFF OR rotates RIGHT motor in OPPOSITE direction )

00           STOP (switches OFF both side motors)

‘1’ should send a high signal and ‘0’ should send a low signal so that AVR Atmega 8 can prepare the

output according to HIGH/LOW signal and send it to L293D IC. Sending ‘0’ switches OFF

corresponding motor or makes it rotate in opposite direction, sending ‘1’ switches ON corresponding

motor to allow Differential Drive steering method. Also if it may be possible to send inputs of more digits,

each digit controlling a particular function like switching on robot lights etc.(in that case sending a 3-digit no.).

 

But I am not getting how to make SIM900 interpret my sms commands and make the Atmega8 or 16 perform the required action on I/O pins. Can you please give me the complete circuit
diagram and PCB diagram with the connections of SIM900, Atmega 8 and L293D IC and other components which I may need?

 

Please Sir help me for this college project.

[SOUBHIK KUMAR DEY]

My Atmega 8 DEVELOPMENT BOARD –

wysiwyg_imageupload:8909:

[SOUBHIK KUMAR DEY]

I have connected PIN RxD (PD0) of Atmega 8  to TxD of SIM900 and PIN TxD (PD1) of Atmega 8 to RxD of SIM900. Pins PB and PC are OUTPUT PINS connected via switches to L293D IC.

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