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  1. Y

    cpin not ready on SIM300E

    I am having exactly the same problem. Sometimes it detects the SIM, most of the times it is not detecting the SIM or it is detecting the SIM but not registering with the network. I am using SIM900d and everything is according to the hd_design_manual recommendation of SIM900d V1.03. Can anyone...
  2. Y

    SIM900d current Problem

    Please if someone has the answer....
  3. Y

    Sim900D email sending problem

    Did you checked the previous pre setting commands properly?
  4. Y

    SIM900d current Problem

    Hi all Please comment if i am doing something wrong. I am not working with SIM900d for the first time. I have pretty knowledge of it. Everything is according to your recommendation in you hd_design_manual for SIM900d v1.03. All i need is to get 30uA current when i just apply 3.6V to VBAT and...
  5. Y

    RF signal Attenuation inside a closed concrete chamber

    I am going for this design. I will post after i get results what ever.
  6. Y

    RF signal Attenuation inside a closed concrete chamber

    I am using GSM/GPRS Module SIM900D inside the chamber. You can consider it as mobile phone. It has a SIM card and it is sending the reading on fixed IP and is also sending SMSs to the different users. I can also use a small glass window on one side of the chamber if it may help a bit. You can...
  7. Y

    RF signal Attenuation inside a closed concrete chamber

    Let me explain it more elaborately. Expected dimensions of the chamber are as follows: The area of the chamber is 60cm*100cm and it has 50cm hight. Side walls will be made of bricks 9cm thickness. The top side is made of concrete of 10cm thickness. Please check the attached two files for...
  8. Y

    RF signal Attenuation inside a closed concrete chamber

    Hi. I am planning to use GSM/GPRS based telemetric gauge inside a closed concrete chamber. As RF signal is not considerably attenuated in media like concrete as compared to free space loss at 10 meter distance. I guess i wouldn't face any low signal problem inside the closed concrete chamber...
  9. Y

    SIM900D Interfacing with hyper terminal.........

    Is there any way to get current time from the network? If there is what are the AT commands for that?
  10. Y

    Voltage above absolute maximum ratings on SIM900D RX pin

    The manual of SIM900D says that the voltage on Tx/Rx pins should not be greater than 3.1V. But i am using PIC16F877A with 5V Vss. So the voltage on Rx pin of SIM900D is automatically greater than the absolute maximum ratings of SIM900D. Also i am not using any kind of protection for PWR_KEY...
  11. Y

    SIM900D Interfacing with hyper terminal.........

    I think the solution is simple...Just enable CAPS LOCK....
  12. Y

    Wireless 418MHz Receiver Interface with PIC MCU problem

    Hi all... I am facing a problem with a chinese wireless 418MHz wireless receiver. I am receiving the code but the voltage on the data line is not fixed though there is a 4.7K pull up resistor. Due to which the MCU hangs for a long time instead of waiting for data string for 1000milli seconds...
  13. Y

    How to operate pic16f688 or pic16f88 with 3.6v supply?

    Hi all, I want to use pic16f88 with 3.6v supply. Its datasheet says operating voltage is 2.0-5.5V. But it is not working with 3.6V. Is it possible with PIC16F88-i/p?????? Or extended version is a must. Waiting for you comments...................................
  14. Y

    [SOLVED] SIM900d MIC problem with noise at remote end

    Hi all, I worked with SIM900d on various projects. It works fine. Now i am doing one project with voice feasures. The MIC performance varies from operator to operator. There is a noise at the other end where SIM900d calls a number. like it works fine with Mobilink, but it is not working...
  15. Y

    How to start SIM900D without PWRKEY in modem

    I used MCU to start the modem..Now i am facing another problem..When i connect it through hyperterminal it works fine on all flow controls.i.e None,Hardware, and Xon/Xoff... But when i connect it with some software like bulk SMS software...it is not detecting the modem...I am using all pins...
  16. Y

    How to start SIM900D without PWRKEY in modem

    Should i ground PWRKEY pin ground permanently???????
  17. Y

    How to start SIM900D without PWRKEY in modem

    Hi all, I want to design GSM modem using SIM900D. I don't want to use PWRKEY to start the modem coz i am not using IC and i dont want to use button as well. Is there any other way to start the modem when external 12v is supplied????????
  18. Y

    [SOLVED] simcom sim900d problem(i can not write any AT Command)

    try changing baud rates from hyperterminal side and check all... one of them should work..
  19. Y

    [SOLVED] SIM interfacing with SIM900D.

    Problem solved..With the replacement of the capacitor with SIM_VDD line i got the SIM detected... ---------- Post added at 06:19 ---------- Previous post was at 06:18 ---------- Maybe the previous capacitor i was using was damaged...

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