Hello everyone, it's been a while since I posted something here.
I'm working on a project, interfacing a GSM module, SIM340CZ, with the PC.
The first I powered it up, with a SIM card attached, everything worked just fine. I was able to set the correct new baud rate to 9600, the flow control to software and even sent and received text messages.
I was able to power it down successfully, however, after a couple a minutes I tried turning it on again and I haven't been able to get it to work again.
I get the AT command CFUN: 1, CPIN: ready and "call ready" repeatedly over and over again. It would seem the module is resetting itself after around 10 seconds. If I remove the SIM card then I can once again communicate with the module without any problems.
I'm using the voltage regulator specified by the hardware design sheet (MIC29302) powered by a computer PSU rated for 20A at 5v, do you think the output voltage is stable enough or should I try with something else? It seemed like a good idea, given that the first time that worked just fine.
I don't have an oscilloscope at hand, so I can't check for a drop in voltage.
Thanks guys, I hope you can help me with this.
I'm working on a project, interfacing a GSM module, SIM340CZ, with the PC.
The first I powered it up, with a SIM card attached, everything worked just fine. I was able to set the correct new baud rate to 9600, the flow control to software and even sent and received text messages.
I was able to power it down successfully, however, after a couple a minutes I tried turning it on again and I haven't been able to get it to work again.
I get the AT command CFUN: 1, CPIN: ready and "call ready" repeatedly over and over again. It would seem the module is resetting itself after around 10 seconds. If I remove the SIM card then I can once again communicate with the module without any problems.
I'm using the voltage regulator specified by the hardware design sheet (MIC29302) powered by a computer PSU rated for 20A at 5v, do you think the output voltage is stable enough or should I try with something else? It seemed like a good idea, given that the first time that worked just fine.
I don't have an oscilloscope at hand, so I can't check for a drop in voltage.
Thanks guys, I hope you can help me with this.
