H
hybrid_snyper
Guest
Thank you very much for that, I will plod on with that and see what i
can come up with. If i have any problems i will let you know.
can come up with. If i have any problems i will let you know.
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No, and it so far off topic that it is _____________.New York - American chocolate lovers in growing numbers are discovering
how to pander to their
addiction and simultaneously help the environment by buying organically
certified chocolate.
So, again ! Is this one of the new marketing gimmick or does this
co-called organic chocolate
really make a different ?
If it is something you want defined:what is bluetooth
Michael A. Terrell wrote
What is Google?
amdx wrote:
Google is a search engine, you type in a keyword
(hint, try bluetooth)
I think the signals may need to be inverted, in which case the aboveCostas Vlachos <c-X-vlachos@hot-x-mail.com> wrote:
hybrid_snyper wrote:
Hi,
I'm looking for some advice, i am trying to control an Ericsson T28
mobile phone by using a PIC16F87X. I understand the how to talk to a
mobile phone by using my COM port on my PC. Is it as simple as
connecting the relevant TX/RX pins to the correct pins on the mobile
phone? Do i need any circuitry between. Ive seen something about MAX232
when using serial communications any tips would be appreciated.
The proper way is to use the MAX232. Another nice IC for this is the
SN75155 (8-pin DIL). Depending on the voltage levels recognised by the
T28, you may be able to do it using simple transistors for the signal
inversion.
Have I read a different post to everyone else?
The guy asks how to connect a PIC to a mobile phone. Neither uses RS232
levels.
PIC <> PC RS232 = MAX232
T28 <> PC RS232 = MAX232
T28 <> PIC = NO MAX232
Find out what voltage levels the pins on the T28 are at. I suspect it'll
be 3.3V logic, but it might be 5V. The easiest thing to do is run the PIC
at the same voltage as the port on the T28, then you don't need a level
shifter and can connect them directly. Series resistors of a few hundred
ohms on the TX and RX lines won't affect the functioning but might save
your PIC or phone if you hook it up wrong.
Tim
Costas Vlachos <c-X-vlachos@hot-x-mail.com> wrote:
hybrid_snyper wrote:
Hi,
I'm looking for some advice, i am trying to control an Ericsson T28
mobile phone by using a PIC16F87X. I understand the how to talk to a
mobile phone by using my COM port on my PC. Is it as simple as
connecting the relevant TX/RX pins to the correct pins on the mobile
phone? Do i need any circuitry between. Ive seen something about MAX232
when using serial communications any tips would be appreciated.
The proper way is to use the MAX232. Another nice IC for this is the
SN75155 (8-pin DIL). Depending on the voltage levels recognised by the
T28, you may be able to do it using simple transistors for the signal
inversion.
Have I read a different post to everyone else?
The guy asks how to connect a PIC to a mobile phone. Neither uses RS232
levels.
PIC <> PC RS232 = MAX232
T28 <> PC RS232 = MAX232
T28 <> PIC = NO MAX232
Find out what voltage levels the pins on the T28 are at. I suspect it'll
be 3.3V logic, but it might be 5V. The easiest thing to do is run the PIC
at the same voltage as the port on the T28, then you don't need a level
shifter and can connect them directly. Series resistors of a few hundred
ohms on the TX and RX lines won't affect the functioning but might save
your PIC or phone if you hook it up wrong.
Tim
Thinking about this more I think we might be talking about differentTim Auton wrote:
Costas Vlachos <c-X-vlachos@hot-x-mail.com> wrote:
hybrid_snyper wrote:
I'm looking for some advice, i am trying to control an Ericsson T28
mobile phone by using a PIC16F87X. I understand the how to talk to a
mobile phone by using my COM port on my PC. Is it as simple as
connecting the relevant TX/RX pins to the correct pins on the mobile
phone? Do i need any circuitry between. Ive seen something about MAX232
when using serial communications any tips would be appreciated.
The proper way is to use the MAX232. Another nice IC for this is the
SN75155 (8-pin DIL). Depending on the voltage levels recognised by the
T28, you may be able to do it using simple transistors for the signal
inversion.
Have I read a different post to everyone else?
The guy asks how to connect a PIC to a mobile phone. Neither uses RS232
levels.
PIC <> PC RS232 = MAX232
T28 <> PC RS232 = MAX232
T28 <> PIC = NO MAX232
Find out what voltage levels the pins on the T28 are at. I suspect it'll
be 3.3V logic, but it might be 5V. The easiest thing to do is run the PIC
at the same voltage as the port on the T28, then you don't need a level
shifter and can connect them directly. Series resistors of a few hundred
ohms on the TX and RX lines won't affect the functioning but might save
your PIC or phone if you hook it up wrong.
I think the signals may need to be inverted, in which case the above
won't work. For a PC <--> PIC connection you don't really need level
shifting but you must invert the signals. I don't know how the T28
serial works. If it's non-standard, the above might work, but I suspect
inversion will be necessary. Two transistors should do the trick.
I see what you mean. If the inversion/level-shifting is done in theCostas Vlachos <c-X-vlachos@hot-x-mail.com> wrote:
Tim Auton wrote:
Costas Vlachos <c-X-vlachos@hot-x-mail.com> wrote:
hybrid_snyper wrote:
I'm looking for some advice, i am trying to control an Ericsson T28
mobile phone by using a PIC16F87X. I understand the how to talk to a
mobile phone by using my COM port on my PC. Is it as simple as
connecting the relevant TX/RX pins to the correct pins on the mobile
phone? Do i need any circuitry between. Ive seen something about MAX232
when using serial communications any tips would be appreciated.
The proper way is to use the MAX232. Another nice IC for this is the
SN75155 (8-pin DIL). Depending on the voltage levels recognised by the
T28, you may be able to do it using simple transistors for the signal
inversion.
Have I read a different post to everyone else?
The guy asks how to connect a PIC to a mobile phone. Neither uses RS232
levels.
PIC <> PC RS232 = MAX232
T28 <> PC RS232 = MAX232
T28 <> PIC = NO MAX232
Find out what voltage levels the pins on the T28 are at. I suspect it'll
be 3.3V logic, but it might be 5V. The easiest thing to do is run the PIC
at the same voltage as the port on the T28, then you don't need a level
shifter and can connect them directly. Series resistors of a few hundred
ohms on the TX and RX lines won't affect the functioning but might save
your PIC or phone if you hook it up wrong.
I think the signals may need to be inverted, in which case the above
won't work. For a PC <--> PIC connection you don't really need level
shifting but you must invert the signals. I don't know how the T28
serial works. If it's non-standard, the above might work, but I suspect
inversion will be necessary. Two transistors should do the trick.
Thinking about this more I think we might be talking about different
things. I would be very surprised if the T28 had on-board circuitry to
generate RS232 levels - ie something like a MAX232 on board. Mobile
phones are too cost, size and power sensetive for that. So I expect on
the connector on the bottom of the phone there is a standard
(non-inverted) logic-level UART connection, which you could connect to a
PIC directly. However, if there is a cable with a DB9 plug on the end to
connect to a PC serial port (ie RS232) I would expect that to provide
RS232 levels, with the conversion provided by something like a MAX232 or
DS276 (like a MAX232 but steals power from the signal lines) inside the
cable. I was talking about the phone end of that cable, you seem to be
talking about the PC end.
So, if the OP has a cable with a DB9 plug designed to plug into a PC and
wants to connect it to their PIC they would need a MAX232. I was
assuming they just had a connector, so wouldn't need one (or an inverter).
I can barely imagine how small a study it actually was. How manyCHICAGO - A small study
Only a few, that's why there's so much.joanneo0322@hotmail.com wrote:
CHICAGO - A small study
I can barely imagine how small a study it actually was. How many
calories in SPAM anyway?
Tim Auton wrote:
Costas Vlachos <c-X-vlachos@hot-x-mail.com> wrote:
Tim Auton wrote:
Costas Vlachos <c-X-vlachos@hot-x-mail.com> wrote:
hybrid_snyper wrote:
I'm looking for some advice, i am trying to control an Ericsson T28
mobile phone by using a PIC16F87X. I understand the how to talk to a
mobile phone by using my COM port on my PC. Is it as simple as
connecting the relevant TX/RX pins to the correct pins on the mobile
phone? Do i need any circuitry between. Ive seen something about MAX232
when using serial communications any tips would be appreciated.
The proper way is to use the MAX232. Another nice IC for this is the
SN75155 (8-pin DIL). Depending on the voltage levels recognised by the
T28, you may be able to do it using simple transistors for the signal
inversion.
Have I read a different post to everyone else?
The guy asks how to connect a PIC to a mobile phone. Neither uses RS232
levels.
PIC <> PC RS232 = MAX232
T28 <> PC RS232 = MAX232
T28 <> PIC = NO MAX232
Find out what voltage levels the pins on the T28 are at. I suspect it'll
be 3.3V logic, but it might be 5V. The easiest thing to do is run the PIC
at the same voltage as the port on the T28, then you don't need a level
shifter and can connect them directly. Series resistors of a few hundred
ohms on the TX and RX lines won't affect the functioning but might save
your PIC or phone if you hook it up wrong.
I think the signals may need to be inverted, in which case the above
won't work. For a PC <--> PIC connection you don't really need level
shifting but you must invert the signals. I don't know how the T28
serial works. If it's non-standard, the above might work, but I suspect
inversion will be necessary. Two transistors should do the trick.
Thinking about this more I think we might be talking about different
things. I would be very surprised if the T28 had on-board circuitry to
generate RS232 levels - ie something like a MAX232 on board. Mobile
phones are too cost, size and power sensetive for that. So I expect on
the connector on the bottom of the phone there is a standard
(non-inverted) logic-level UART connection, which you could connect to a
PIC directly. However, if there is a cable with a DB9 plug on the end to
connect to a PC serial port (ie RS232) I would expect that to provide
RS232 levels, with the conversion provided by something like a MAX232 or
DS276 (like a MAX232 but steals power from the signal lines) inside the
cable. I was talking about the phone end of that cable, you seem to be
talking about the PC end.
So, if the OP has a cable with a DB9 plug designed to plug into a PC and
wants to connect it to their PIC they would need a MAX232. I was
assuming they just had a connector, so wouldn't need one (or an inverter).
I see what you mean. If the inversion/level-shifting is done in the
phone cable, then he should be able to do it like you said in your first
post (direct connection, resistors for protection). It makes sense for
the phone manufacturer to move the MAX232 or similar IC outside of the
phone for size/cost issues. The OP can connect directly like you said
and see what happens. If it doesn't work, invert the signals and try
again. I don't think level shifting will be necessary for such a small
device anyway (it definitely isn't for modern PCs). I was just assuming
that the Tx/Rx signals from the phone would match the standard polarity
of the RS-232 in which case inversion would be necessary. I suppose he
could measure the phone's Tx line when idle to determine whether
inversion is needed.
--
Regards,
Costas
_________________________________________________
Costas Vlachos Email: c-X-vlachos@hot-X-mail.com
SPAM-TRAPPED: Please remove "-X-" before replying
Chocolate is an essential component of professional electronic design."koko" <joanneo0322@gmail.com> wrote in message
news:1163406208.449940.267000@m73g2000cwd.googlegroups.com...
New York - American chocolate lovers in growing numbers are discovering
how to pander to their
addiction and simultaneously help the environment by buying organically
certified chocolate.
So, again ! Is this one of the new marketing gimmick or does this
co-called organic chocolate
really make a different ?
No, and it so far off topic that it is _____________.
OK, these are nice links relating to what you want to do. From the firstSo direct connection is the way to go. I found these two links a while
back. The first is what I believe to be the circuitry within the
datacable and to which would allow me to eliminate the cable.
http://pinouts.ru/CellularPhonesCables/ericsson_cable_pinout.shtml
this next link shows a guy which has a Tiny12 connected directly via a
datacable to his MCU. I take it would be a similar setup to this. He
has the data entering the MCU fed direct with a 4700 resistor in
between. However he has added circuitry to create a true bi-polar
signal. Im not sure what this means.
http://www.riccibitti.com/tinyplanet/tiny_article.htm
I'm pretty sure it's all organic, John. Although I wouldChocolate is an essential component of professional electronic design.
And most of the organic stuff tastes horrible.
joanneo0322@hotmail.com wrote:
CHICAGO - A small study
I can barely imagine how small a study it actually was. How many
calories in SPAM anyway?
On Mon, 13 Nov 2006 18:18:12 -0500, "Charles Schuler"
charleschuler@comcast.net> wrote:
"koko" <joanneo0322@gmail.com> wrote in message
news:1163406208.449940.267000@m73g2000cwd.googlegroups.com...
New York - American chocolate lovers in growing numbers are discovering
how to pander to their
addiction and simultaneously help the environment by buying organically
certified chocolate.
So, again ! Is this one of the new marketing gimmick or does this
co-called organic chocolate
really make a different ?
No, and it so far off topic that it is _____________.
Chocolate is an essential component of professional electronic design.
And most of the organic stuff tastes horrible.
John
Oops,luisdanielsilva@gmail.com> schreef in bericht
news:1163360427.487718.18100@h54g2000cwb.googlegroups.com...
I need to convert a 32 bit binary number to gray code. i know how to do
it bit by bit, but i need to do a function to do it, so that i don't
need to repeat code 32 times. Can anybody help me?
Thanks
LDS
Mmm... It's quite some time I wrote 8051 assembler, but if memory serves
it's done like this:
num1 equ 64
num2 equ 65
num3 equ 66
num4 equ 67
clr c
mov a,num1
rlc a
xrl a,num1
mov a,num2
rlc a
xrl a,num2
mov a,num3
rlc a
xrl a,num3
mov a,num4
rlc a
xrl a,num4
end
petrus bitbyter
So to use the proper connector is going to require the max232 anyway,Ericsson cable (with the level shifter/inverter inside), then you need
to invert the signals again so that the PIC & phone can talk to each
other. Hope this is now clearer.
--
Regards,
Costas
_________________________________________________
Costas Vlachos Email: c-X-vlachos@hot-X-mail.com
SPAM-TRAPPED: Please remove "-X-" before replying
Agreed. Now where is my vending machine money, I have a design reviewOn Mon, 13 Nov 2006 18:18:12 -0500, "Charles Schuler"
charleschuler@comcast.net> wrote:
"koko" <joanneo0322@gmail.com> wrote in message
news:1163406208.449940.267000@m73g2000cwd.googlegroups.com...
New York - American chocolate lovers in growing numbers are discovering
how to pander to their
addiction and simultaneously help the environment by buying organically
certified chocolate.
So, again ! Is this one of the new marketing gimmick or does this
co-called organic chocolate
really make a different ?
No, and it so far off topic that it is _____________.
Chocolate is an essential component of professional electronic design.
Some of the organic stuff here in Oz is pretty good, but you can'tAnd most of the organic stuff tastes horrible.
---John Larkin wrote:
On Mon, 13 Nov 2006 18:18:12 -0500, "Charles Schuler"
charleschuler@comcast.net> wrote:
"koko" <joanneo0322@gmail.com> wrote in message
news:1163406208.449940.267000@m73g2000cwd.googlegroups.com...
New York - American chocolate lovers in growing numbers are discovering
how to pander to their
addiction and simultaneously help the environment by buying organically
certified chocolate.
So, again ! Is this one of the new marketing gimmick or does this
co-called organic chocolate
really make a different ?
No, and it so far off topic that it is _____________.
Chocolate is an essential component of professional electronic design.
Agreed. Now where is my vending machine money, I have a design review
this afternoon...
And most of the organic stuff tastes horrible.
Some of the organic stuff here in Oz is pretty good, but you can't
really beat that extra added and processed chemical taste. Organic
chocolate prices are insane though, I would rather have a 300g family
block of Cadbury which costs less than a 40g organic bar.
One organic bar you can get in Oz is associated with some save the
animal fund, so you can rid yourself of chemicals, save the polar bear
and feel good about yourself at the same time, so you don't notice
paying 10 times the regular price.