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.
I've done more search on the internet and done some testing on my own... from what I've found the TX data transmitted by the phone is only 2.68V for logic 1... This explain why the 89s51 failed to act according to the feed back of the phone as 89s51 needs 5V to consider as the signal as logic 1...
from what I can see.... The microcontroller manage to send AT command to handset.... However the microcontroller might failed to do this things...
1. the feedback from the phone did not reach the microcontroller
2. or the microcontroller failed to act accordingly with the feedback of the phone...
hi friends.... I've already try out saeed's connection.... to my surprise it did as same as when I connected it with the 2 max232... it dial the phone that is commanded to it... however, the program that have work with proteus, still won't work with this connection.... can anybody help me... My...
thanks everybody for the quick replies... Its good having helping hands such as yours... well, back to biznez.... ^_^ ...
hi nikhil... I did notice that we could use a single max232 for both the phone and the 89s51... however, in my case I used separate max232 for ease of troubleshooting...
thanks sir for continous replies... you've been great... I'm trying out your suggestion.. (this maybe quit silly)huhu... but where actually to put the LEDs? this is the max circuit use for the phone
[url=http://obrazki.elektroda.pl/46_1287406574.jpg][/url
yup... In my opinion it need max to connect to pc... my project is "sms controlled relay".... Sir, any idea to make my circuit functioning? my head is cracking open to find the solutions... huhu...
sir, I think I still need the max232... when I modified the data cable what I mean is that I connect the data cable to the max circuit and then only I connected it to the pc... I also run a simple test just now... I connected the hardwares as the following...
thanks for your reply jerin... The original usb cable use usb connection... but I modified it so that it use serial connection.... then I connect it to the comport of the pc and talk to it via hyperterminal... this is the screen shots of the experiment I did earlier....
---------- Post added...
first of all, thanks for your quick replies... I really do appreciate it.... I do... I hope u guys can guide me all the way....
well sir, actually I thought the connection is like this...
phone---->max232--->pc
89s51---->max232--->pc
combining them both...
hello guys.... I started posting again... and ya, its about the same thing again... .
my project is in the last stage of completion... I manage to connect my phone sony k700 to PC with the connection as below
phone-->max232---> pc
with this connection I'm able to send AT command to the phone...
HELLO GUYS AND GALS... I'm doing a sms controller for my final year project... I'm using sony ericsson k700 in my project... my connection is as the following
PC-->max3232-->SE K700
I've already done testing sending at command to the mobile phone through...
hi guys...I'm newbie trying to do a gsm based project... Right now I'm trying to connect my sony ericsson K700 to the hyperterminal console.
however, the hyperterminal is giving me meaningless replies. Anybody have done this before? I really need guidance here...
regards
kamal
hi guys... well i'm doing the similar project as amilla and also use k700 in my project... using the max232 circuit and the dcu11 cable, i've tried to communicate to my phone using hyperterminal... but nothing show up... can anybody help me here? thanx in advanced... ^_^
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
