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

gsm modem sim300+pic without max232...

Status
Not open for further replies.
A

avrsanju

Junior Member level 3
Joined
Jul 16, 2010
Messages
29
Helped
7
Reputation
16
Reaction score
10
Trophy points
1,283
Location
india
Activity points
1,623
hai all,gsm modem sim300+pic without max232...(iam using 3.7 volt cellphone battery for pic and modem.) can i communicate properley with modem and viceversa?.i do not interested to use max 232,advice me pls.:!:
 

sim300 has max232 circuit in it... that means it converts TTL to rs 232 logic... you cannot skip maz 232 on controller side .... you cannot do it
 

As I can see from the datasheet rainbow.com.ua/upload/files/modemi/SIM300_HD_V1.06.pdf -
You can connect the Sim300 directly to the microcontroller without the Max232.
Check page 16 in the datasheet, you will find that the serial interface 1 has "TTL" voltage levels. So, you don't need to use a MAX232.

Hope this helps.
 

you cannot do this with the development board. but if you design your custom board you dont need any level converter to talkin between pic ans sim300.
 

i compleated this without using max232.....16f676-(tx)->simcom sim300 rx in,sim300 tx out to 676 PIN RA_2.(i used #int ext to pole the signal+timedgetc() to filter at _ reply from sim300)....but some char are missing...anyway i can send sms nicely..)
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top