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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...
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...
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...
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...
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...
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...
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...
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...................................
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...
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