[arm-allstar] RGB LED RPI

[Peter]

Tom,

I use the events subsystem and the wiring Pi library.

The key thing here is a few entries in rpt.conf

;
:

[events]
/usr/local/sbin/1low = s|t|RPT_TXKEYED
/usr/local/sbin/1high = s|f|RPT_TXKEYED
/usr/local/sbin/0low = s|t|RPT_RXKEYED
/usr/local/sbin/0high = s|f|RPT_RXKEYED

;
;

Going to and from an event like RX(COS) keyed or unkeyed will fire off a shell command, in my case a 4 applications to toggle to state of GPIO pins.


Here is the source of the application to toggle GPIO 0 LOW, edit as needed for each pin/state.

#include <wiringPi.h>
#include <stdlib.h>
int main (void)
{
wiringPiSetup () ;
pinMode (0, OUTPUT) ;

{
digitalWrite (0, LOW) ;
}
exit (0) ;
}


To compile:


gcc -Wall -o 0low 0low.c -lwiringPi


Do the same for the other 3 stats/pins.

The LED is an RGB 'common anode' supplied from the 3.3v rail via a 10k resistor. Here is a close up of the LED, just a bit of matrix board and some header pins. https://www.flickr.com/photos/127794264@N08/36908775383/

Yes, there are other ways of doing it, either controlling the GPIO pins or driving the LED from hardware external to the Pi. This is how I do it which is simple and with reproducible results.

HTH

73
Peter
G7RPG



On 08/10/2017 20:24, "TomXtal via arm-allstar" wrote:
Thanks for your input Doug. I have watch a youtube of Peter Kendall G7RPG of his micro node www.youtube.com/watch?v=CTIgOlsq9jI<http://www.youtube.com/watch?v=CTIgOlsq9jI> which uses a status LED, this is what I'm trying to do. I can see it is wire to the GPIO pins but I can not see which pins are being used.

Tom

"Doug Crompton via arm-allstar" <mailto:arm-allstar at hamvoip.org><mailto:arm-allstar at hamvoip.org>
08 October 2017 19:27
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><http://www.crompton.com/hamradio>*




On Sun, Oct 8, 2017 at 2:15 PM, "TomXtal via arm-allstar" <
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"TomXtal via arm-allstar" <mailto:arm-allstar at hamvoip.org><mailto:arm-allstar at hamvoip.org>
08 October 2017 19:15
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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