SIM 300 V7.03 Under Voltage Warning

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anil404

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Hi all,

i have a sim300 gsm module , when i give commands its giving UNDER VOLTAGE WARNING . what is the reason to get this warning . How to resolve it. The modem is using 7805 regulator is it k ot shall i replace with LM317.

i found the reason is due to low volatge at VBAT<3.5.
How to resolve it.
 

Boost voltage to needed voltage, or use adequate power source.

You probably try with Li-Ion battery, and voltage falldown under load.

To use 7805 at least 2,5V-3V difference is needed between input and output voltages.
 

thank you for your reply tpetar,

I am also having problem with sim900A. The modem is continuously restarting after registration.

What may be the problem ?
 

when i run the batch file "run"...then mode sets to read(at+cmgr=1) and its starts to read the first message continuously...can any1 please help me out of this??
thanks!!!
 

gautiraam said:
when i run the batch file "run"...then mode sets to read(at+cmgr=1) and its starts to read the first message continuously...can any1 please help me out of this??
thanks!!!
Click to expand...

As per i know In at+cmgr=1 , 1 indicates message number . So it reads msg 1 continuously.
 

anil404 said:
As per i know In at+cmgr=1 , 1 indicates message number . So it reads msg 1 continuously.
Click to expand...

yeah....it's happening like that only...but if i send messages it's not responding...is there any possibilities to reset it?
 

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