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[plz]8051 + cell phone

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there is a bad news, our nokia 8250 was spoil, so we decide to use nokia 2300.
we already found out the data sheet for nokia 2300.
https://pinouts.ru/CellularPhones-Nokia/nokia_1100_pinout.shtml
we had modified the circuit, as the following picture. is that any mistake we make?
thank for ur help.
0_1166118404.gif
 

hi,

i used the C55 seimens it is AT command compatible easy to interface. only connect this mobile with first hypertrm, and test all the commands then after testing this mobile you can easily interface with 8o51 type controller but u have to convert the serial data in to RS232 then interfac with mobile

47_1166234490.JPG
 

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    wcgan

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i am wrote a 8051 program already, but my phone cant function...
so i try to test my cell phone wit computer first..
interface like this...
86_1166368891.JPG

i am using serial port - com2..
and hyper terminal..
but... when i type "AT" to cell phone.. it wont reply "OK"..
is my circuit problem or not?
 

Your circuit seem OK. Do You have Data Cable for 2300, it is better to test the phone with original data cable before you build your own circuit.
 

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    wcgan

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kishorekhatri wrote
i need complete set of AT-commands for Nokia
Click to expand...
You have it here AT_Command_Set_For_Nokia_GSM_And_WCDMA_Products_v1_2_en.pdf
 

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    wcgan

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budhy said:
Your circuit seem OK. Do You have Data Cable for 2300, it is better to test the phone with original data cable before you build your own circuit.
Click to expand...
i went many mobile shop already, but dun have..
 

sorry..
i am confusing now..
dun know is 8051 program problem or my cell phone connection problem..
i dun know how to check it now...
i am connect cell phone nokia 2300 to pc.. using hyper terminal to test the AT command, but the cell phone no reply...
can anyone give me suggestion or any solution?
or write a simple 8051 program, about delete a msg from cell phone
AT+CMGD=1
thanks a lot.
 

Test it with the most simple command : AT
Cell phone will answer OK if the connection is good

Try difference baud rate, and recheck HyperTerminal COM port setup
 

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    wcgan

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budhy said:
Test it with the most simple command : AT
Cell phone will answer OK if the connection is good

Try difference baud rate, and recheck HyperTerminal COM port setup
Click to expand...
that's means if i connect like this circuit..
86_1166368891.JPG

i am can use hyper terminal to test...
if i cant get "OK" from hyper terminal, that means my connection got problem
so i can go futher to 8051 part rite?
 

Fix the connection first, after that go further with uC
 

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    wcgan

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i bought a cable already...
but the problem is... not serial port, is RJ-45
how can i connect to pc?
can i just connect TX,RX,GND to serial port TX,RX,GND.
no need change voltage or still need change voltage?
those cable with serial port was already converted voltage or wat?
y can directly connect to serial port.?
thanks ...
53_1166607989.jpg

89_1166608004.jpg


those serial port cable already changed voltage? phone not operate on 3.3v?
serial port is +12 and -12v rite?
64_1166610386.jpg
 

I know nothing about your RJ45 cable, may I have more specific technical information, or the type (name) of that cable?

The third photo look like a RS232 serial cable, plug it to PC COM port and measure the voltage at the phone connector side. At idle state the RX line is 3 Volt, but Tx line un-measureable (floating).
 
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    wcgan

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    zeilja

    zeilja

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budhy said:
the type (name) of that cable?
Click to expand...
they called this cable "NK1110" or "AT133"
budhy said:
The third photo look like a RS232 serial cable, plug it to PC COM port and measure the voltage at the phone connector side. At idle state the RX line is 3 Volt, but Tx line un-measureable (floating).
Click to expand...
the picture of serial port cable is copy from internet, because i want to ask, it without extra circuit, is that converted voltage already?
u said that before cellphone is 3.3v, but if direct connect to serial, serial port is +-12v, i cant understand this...
thanks/..
 

that serial port cable copy from internet, it without extra circuit, is that converted voltage already?
u said that before cellphone is 3.3v, but if direct connect to serial, serial port is +-12v, i cant understand this...
Click to expand...

There a 3.3 Volt to RS232 Voltage level converter inside the special DB9 connector!

Just plug the DB9 connector to COM port, and mesure the voltage on the Cell Phone connector side!
 

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    wcgan

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budhy said:
that serial port cable copy from internet, it without extra circuit, is that converted voltage already?
u said that before cellphone is 3.3v, but if direct connect to serial, serial port is +-12v, i cant understand this...
Click to expand...

There a 3.3 Volt to RS232 Voltage level converter inside the special DB9 connector!

Just plug the DB9 connector to COM port, and mesure the voltage on the Cell Phone connector side!
Click to expand...
sorry about that, make trouble to u..
thanks a lot .
 

this is my program, just wan delete a msg from hp..
my program got any wrong or not?
i link to my cell phone, cant work..
thanks.
//
hidden
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