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Hi, i am doing a project on encryption and decryption.
For my project i need to encrypt and decrypt DTMF(Dual Tone Multi Frequency) signals.
These are analog signals in voice frequency range.
Can anybody suggest me how to do encryption of DTMF signals?
Hi
I am working on a tracking system in which i have to interface GPS and GPRS to a processor.
Here i am not working on any development or evaluation boards.
For this system i need an SOC with GPRS.
Is there any processor or SOC available that has in built GPRS functionality?
Hi. I am from Hyderabad, India.
I am doing a research project using FM.
For this we need FM experimental licence.
anyone know the procedure for applying FM experimental licence?
Hi. I am working with SIM300 for for text data transmission. But my application is to transmit image, audio and video files. SIM300 is not supporting MMS.
Then i referred the specifications and AT commands of SIM900, which supports text and image file transmission. SIM900 supports MMS AT...
Hi. I am working on communicating with two SIM300 GPRS modems. I am able to establish the TCP/IP connection using GPRS. I also sent a text data from one GPRS modem to another using TCP/IP. I configured the second GPRS modem as the server. Now i need to send a text file from one GPRS modem to...
My SIM300 modem supports establishing the TCP/IP connections. But it is not supporting MMS AT commands. If the modem supports MMS AT commands we can send MMS
Hi,
I am a student doing project on GPRS modems. I need two GPRS modems, which supports MMS. In my project i required to transmit image, audio and video files between the two GPRS modems. Presently i am working with SIM300 GPRS modem. But it is not supporting MMS commands. Does SIM900D module...
Hi ....
any body can help me to sending the GPS coordinates (longitude and latitude) using GPRS modem to another GPRS modem.
I am using SIM300 GPRS modem.
I am using Airtel sim. It has also enough balance for outgoing calls.
Just before 2 days i am able to send the SMS and established TCP connection using the SIM300 through AT commands. All AT commands are worked well.
But now when i make a call to the sim card presented in the same SIM300...
Dear friends,
I am using a SIM300 GPRS modem.
When i make a call by using ATD command it gives NO CARRIER and sometimes NO DIALTONE.
When i want to send an SMS using AT+CMGS command it gives +CMS ERROR : 515.
Plz can anyone try to solve my problem?
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