hi every one!
in my project i need to receive sms from cell phone for that i have to use gsm shield,and i dont want to use the shield instead i want to use sim 900, because latre on i have to design a pcb for my project and i dont use shield in that , that's why i want to use sim 900,i only know the basic interface of sim 900 i-e power supply,sim card holder,reset,netlight, status, pwr key antenna ...in this i dont know how to interface sim 900 with arduino ,will anybody please help me out in this ?? do i need to interface other things with sim 900 except the other which i mentioned above in order to recieve sms??it will be very helpful for me if someone send me the whole interference for sim 900.. and for power supply i have used lm2576 regulator, and i have attached the picture of that power supply circuit too, plz suggest me is that ok?? can i supply power to my sim 900 through this ??
thanks in advance
Just research the schematic from the efcom pro sim module or similar. They are based on the sim900 and the datasheets are freely available.
Also, your question is not a programming question. Better move this to the proper topic.
SIM900 requires a supply voltage of 3.4V - 4.5V. I wouldn't recommend 5 volts.
hi every one!
in my project i need to receive sms from cell phone for that i have to use gsm shield,and i dont want to use the shield instead i want to use sim 900, because latre on i have to design a pcb for my project and i dont use shield in that , that's why i want to use sim 900,i only know the basic interface of sim 900 i-e power supply,sim card holder,reset,netlight, status, pwr key antenna ...in this i dont know how to interface sim 900 with arduino ,will anybody please help me out in this ?? do i need to interface other things with sim 900 except the other which i mentioned above in order to recieve sms??it will be very helpful for me if someone send me the whole interference for sim 900.. and for power supply i have used lm2576 regulator, and i have attached the picture of that power supply circuit too, plz suggest me is that ok?? can i supply power to my sim 900 through this ??
thanks in advance
Before I start to go into complications, I shall ask - Why the SIM900? Do you specifically need the GPRS functionality or GSM alone is good enough?
Any of the older Sony ericsson phones can easily be interfaced
They can:
Be charged using the arduino 5V supply with no other modifications
Supply Power (battery voltage @ 50mA) to the arduino in case of a power failure
And the normal RS-232 communication to access the internal modem for GSM operations
Now the shields and the SIM900. I found them all to be rather poor. They use a linear regulator which sometimes cant cope with the peaks required for transmission. If you are building your own one I would start with a KIS-3R33S. The LM25xx are poor regulators, I worked with all them in the past (Step up, step down) but there are better alternatives now that provide higher current output and less heat dissipation.
@ashali1234, do not cross-post. Threads merged.