[nikhiljain]

Yes correctly identified. It is dependent on manufacturer to manufacturer. Please refer datasheet for best answers. Also you can check it using multimeter like what has been explained.

[nikhiljain]

Couple of problems I can see.

 

1. Infinite loop is missing.

2. Logical error, if you want to send the string on the port which is stored in the array, why do you need the serial port.

[nikhiljain]

Hi,

 

Please search the following three project having project code: MC074, MC075 & MC076 in the 8051 section of this website under EG labs. You are misunderstanding the logic behind recieving and sending text to GSM modem.

[nikhiljain]

Hi,

 

Read the following three article in order:

 

http://www.engineersgarage.com/microcontroller/8051projects/gsm-interface-8051-microcontroller-circuit-code

http://www.engineersgarage.com/microcontroller/8051projects/interface-gsm-module-8051-microcontroller-circuit-code

http://www.engineersgarage.com/microcontroller/8051projects/interfacing-gsm-8051-microcontroller-circuit-code.

 

To me it appears that all you are doing is a logical error in understanding the working of GSM modem.

[nikhiljain]

Hello,

 

Please check the GSM interfacing projects and tutorial on this website and your problem will be solved. Pls note the GSM modem also sends some additional characters with the data like “OK”. They are some special characters like line feed, carriage return etc and hence there is garbage data.

 

There is a standard pattern of sending and reciveing data to the modem. When you recieve the data you need to remove/filter/reject/some of the bytes to discard the unwanted data and capture only the data you want. Similar is the case while sending the data to the modem. In sending you have to add the charchters.

 

Please go through the GSM based work on the website in the 8051 section.

[nikhiljain]

such projects are available on this site.. please browse thru EG Labs projects before posting such threads.

 

FYI check : http://www.engineersgarage.com/microcontroller/8051projects/stepper-motor-control-ULN2003-at89c51-project-code-circuit

[nikhiljain]

such projects are available on this site.. please browse thru EG Labs projects before posting such threads.

 

FYI check : http://www.engineersgarage.com/microcontroller/8051projects/stepper-motor-control-ULN2003-at89c51-project-code-circuit

[nikhiljain]

Hello,

 

Try this

 

http://www.engineersgarage.com/tutorials/what-is-hex-file-format

[nikhiljain]

Hello,

 

Try this

 

http://www.engineersgarage.com/tutorials/what-is-hex-file-format

[nikhiljain]

Check you circuit. i tried the same and it was working for me.

[nikhiljain]

whats the output of this code. Are there any movements or not.

[nikhiljain]

Why dont you start experimenting with the circuit, start making a few circuits based out of LM324 and for sure you will be able to make what you want. There are many circuits given on this site itself.

[nikhiljain]

It should be problem with the circuit that you have made. Try to find the problems with your project.

[nikhiljain]

a better way would be to check the datasheet of the manufacturer. It will surely be mentioned there.

[nikhiljain]

good idea but technically difficult

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