[arm-allstar] RGB LED RPI

[Doug Crompton]

Tom,

 You did not say what you want the LED to indicate but I suspect that the
node is transmitting and receiving?  There are no pins on the RPI that
indicate TX/RX status. TXD and RXD are serial port pins that send digital
data. All pins on the Pi are 3.3V max also.

The PTT indication is available on the USB FOB. Most FOBS have an LED
indicating this. If not the PTT line could be used as a pull down for an
LED wired to +5V through an appropriate resistor.

For RX the COS signal can be programmed to raise or lower an unused bit on
the FOB - see the txctcss howto on the hamvoip web page. You also could do
this with hardware and build a little circuitry to use the COS line to turn
on the LED. This could need to be inverted depending on how your radio uses
the COS line.


*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*




On Sun, Oct 8, 2017 at 2:15 PM, "TomXtal via arm-allstar" <
arm-allstar at hamvoip.org> wrote:

> I have build a Allstar node with RPI 3 which works just fine. What I would
> like to do is have a status LED using a RBG LED, I would like to know which
> GPIO pins to use. I know i can use pin 2 or 4 for power no but do not know
> which pins for TX and RX maybe pin 8 (TXD) and pin 10 (RXD). So I need some
> advice.
>
> Tom
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