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when you are interfacing a controller with gsm module your data will be sent within very short time so you will not experience the fact that "module cannot accept at commands until number of bytes specified in the last command(AT^SISW) are entered". if you try it with hyper terminal you will get it.
While sending data if you get a call & wanna give it a high priority than gprs connection then switch from data mode to command mode using +++ command. Make sure that +++ should be preceded & followed by a delay of at least 1000ms. Also +++ sequence should be entered in a quick succession...
I have used the same circuit as depicted in datasheet.
component values are :
R2=2kohm, L=33uH,Cout=330uF,Cff=33nF,Cin470uF
My i/p is 12V/1A power supply.
Hello all,
I am tryig to design the power supply using switching regulators. I have 12V/ 1A power supply. I want its o/p to be 4V/2A. I have referred the datasheet for implementing the circuit. Switching regulator IC is LM2596. I tested the circuit with 4ohms of resistance at the...
Hello all,
I am interfacing sim900 modem with PIC micro-controller. When I make a call from sim900 & reject it at other end I don't get any response before the timeout period set by ATS7(which is by default 60 sec). After time out it gives response as NO ANSWER. I need to get it as...
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