Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

[SOLVED] call waitng facility in sim300 interfacing with 8051

Status
Not open for further replies.
D

debabrta kar

Member level 5
Member level 5
Joined
May 20, 2013
Messages
86
Helped
7
Reputation
16
Reaction score
5
Trophy points
1,288
Location
india
Activity points
1,858
hi.. i am interfacing sim300 with 8051. how can i activate call waiting facility...i mean when modem recieves a call from one number and if i will call from another number to modem them the 2nd user must be in a waitng...
 

Hello friend,

Can you send me your interfacing circuit diagram.
I use P89v51Rd2 means 5V microcontroller and my GSM module (SIM900) is working at 4.2V, so how can i connect my Micro RX, TX which is at 5V to SIM900 RX, TX which is 4.2V support.

Please help me to design my circuit.
Thanks in advance.

Regards,
Ghanshyam
 
as their not TTL compatible so in both side sim900 module and microntroller side u have to use max232 in both side......
 

Hello friend,

I think, Module Tx to Micro Rx line drive from module side, so need not any addition component and may connect directly.
For, Module Rx to Micro TX line drive from 5V (Micro side), so here i think we should use some type of resister divider circuit.

Please, Expert people comments on my suggestion.

Regards,
 

sim900 operates in 3.3v as it has a arm microcontroller inside modem...so kindly check the voltage level whichi is not 4.2 and its 3.3.v.....
 

can i get the number from which m giving a call to sim300.......please guide me.....
 

yes sir...thanx...but how to perform a call waiting service....
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top