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Hello All,
I have configured the UART on PIC16F690 for data reception as well as transmission, the tx is working fine and data is perfectly received on the computer terminal through COM port. But when I send data to the MCU from the computer, the data isn't coming up. I confirmed using an...
Free web server may NOT be available; but free web hosting space is definitely available which can be used (I have used from orgfree.com).
I am using php (along with MySQL) codes to dynamically generate webpages containing data that have been received from GSM modem. The MCU (along with the GSM...
We have set AT+CREG=0 and it seems that the problem have solved. Now, there is NO module shutdown. We earlier noticed that during the time we issued AT+CIPSEND & the unsolicited message +CREG: 2, 1, "5678", "23DF" came, the module was shutting down...
Now we will check for AT+CREG once every 5...
I also tried the same but couldn't figure out one...
So, I would suggest that you send an outgoing SMS to the SIM900 module itself & the SMS will bear a time stamp which may be useful to you... I think that the time may contain delays depending on network conditions...
Alternately, if you are...
We have conducted thorough tests on the matter. What we have found out in this context:
A. The GSM module shutdown occurs only when the GPRS connection is live [In our Vehicle Tracking System, when we are keeping the data upload to the server disabled and using SMS for vehicle tracking, the GSM...
The local IP address is set by the network operator. Usually the network operator will not allow that to be set manually, but you may check with your network operator.
We also had similar type of problem initially during the starting phase of our vehicle tracking system project.
We found out later that the ASCII code 0x01A is actually not transmitted to the GSM module, due to the weird nature of the hyper terminal program we were using. Our problem was solved...
We had somewhat same issue earlier. We found that H1 sim cards are working whereas H2 sim cards are NOT. We paid special attention to the SIM card tracks going from the GSM module to the SIM card holder (we made it shorter) & it worked. You may try it out.
Continuous power consumption is not more than 550mA (as we have tested on field). But maximum surge current may rise upto 2 Amps for which a high value low ESR (preferably a Tantalum capacitor) capacitor is expected between VBATT & GND. VSIM & GND also required capacitor for decoupling purpose.
We have tried with electrolytic capacitors of 1000uF, but the same issue is still there. The track size is 2 mm thick and not more than half inches from the power plane to SIM900D's VBATT pins.
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