[OZAPRS] IO PCB audio pTT etc

Matthew Cook vk5zm at bistre.net
Tue Jan 30 17:04:44 AEDT 2018


I'd also suggest the following;

   - pull the TX/RX of the FT230 into a RS232 driver to allow radio control
   - Have some form of H/W monostable watchdog for the Pi (mostly likely
   dump power)
   - It would also be a good idea to have some form of UPS function where
   it shutsdown the Pi or disables the radio (relay?) when the supply volts
   are 10.5V or less (programmable ?)



On 30 January 2018 at 15:36, Glen English VK1XX <
glenlist at pacificmedia.com.au> wrote:

> Today I have done a schematic for a board to plug into either Pi or
> Odroid, OR any platform with a USB for the usual requirements- audio I/O ,
> PTT, a uart  and some spare pins for GPSPPS etc
> Before I finalize it, are there any requests ?
> Currently :
> 40 pin header for direct connection of IO to Odroid or RPi for
> On board USB audio device (PCM2903) for TX/RX audio  (two channels so can
> suit  IQ radio)
> On board USB UART (FT230) for generating RTS for generating PTT, and gives
> you a 3.3V serial port
> On board 8-30V in to 5V DCDC converter. quiet.
> HW watchdog on PTT
> Some IO for ? (2 x analog in, 2 x uart 1 x I2C)
> should be buildable for $30 or less. all easy SMT sizes.
> the idea is you can plug USB audio , USB uart  for any platform, or you
> can use the built in expansion header IO for PTT etc direct on a suitable
> board. IE good for PC or good for Odroid/PI.
> green pluggable header for radio interface.
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