[OZAPRS] IO PCB audio pTT etc
Glen English VK1XX
glenlist at pacificmedia.com.au
Tue Jan 30 16:06:51 AEDT 2018
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 ?
40 pin header for direct connection of IO to Odroid or RPi for
GPS/UART/PTT/RX mute / IO
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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