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Discussion Groups | BasicX | COM3 Voltage 5V to 3V
Discussion forum for the BasicX family of microcontroller chips.
COM3 Voltage 5V to 3V - ap0c...@gmail.com - Aug 22 7:37:57 2007
I have configured 2 pins for com3 to communicate with a Siemens C35 using its RX,TX pins
so far so good i can communicate with the cellphone, but in order to the cellphone don't
loose its network signal the voltage in the RX pin must be limited to 3V to communicate
with correctly and without the phone loose its network signal.
How can i make the voltage come down from 5v(comp3 RX) to 3V(cellphone TX)? i was thinking of using a MAX3232 between the two com3 pins and the cellphone in order to convert the 5v in 3v should this work? or are any easier way?
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How can i make the voltage come down from 5v(comp3 RX) to 3V(cellphone TX)? i was thinking of using a MAX3232 between the two com3 pins and the cellphone in order to convert the 5v in 3v should this work? or are any easier way?
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: COM3 Voltage 5V to 3V - Pedro Dias - Aug 22 11:07:53 2007
On Wednesday 22 August 2007 05:58, a...@gmail.com wrote:
> I have configured 2 pins for com3 to communicate with a Siemens C35 using
> its RX,TX pins so far so good i can communicate with the cellphone, but in
> order to the cellphone don't loose its network signal the voltage in the RX
> pin must be limited to 3V to communicate with correctly and without the
> phone loose its network signal.
>
> How can i make the voltage come down from 5v(comp3 RX) to 3V(cellphone TX)?
> i was thinking of using a MAX3232 between the two com3 pins and the
> cellphone in order to convert the 5v in 3v should this work? or are any
> easier way?
I figured it out, solved the problem doing a voltage divider with a 12K
resistor between basic TX and cellphone RX and another 18K resistor between
cellphone RX and GND.
Thnks anyway :)
--
Pedro Dias
a...@gmail.com
http://alumni.ipt.pt/~pmad/
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
> I have configured 2 pins for com3 to communicate with a Siemens C35 using
> its RX,TX pins so far so good i can communicate with the cellphone, but in
> order to the cellphone don't loose its network signal the voltage in the RX
> pin must be limited to 3V to communicate with correctly and without the
> phone loose its network signal.
>
> How can i make the voltage come down from 5v(comp3 RX) to 3V(cellphone TX)?
> i was thinking of using a MAX3232 between the two com3 pins and the
> cellphone in order to convert the 5v in 3v should this work? or are any
> easier way?
I figured it out, solved the problem doing a voltage divider with a 12K
resistor between basic TX and cellphone RX and another 18K resistor between
cellphone RX and GND.
Thnks anyway :)
--
Pedro Dias
a...@gmail.com
http://alumni.ipt.pt/~pmad/
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )