[OZAPRS] IO PCB audio pTT etc

[Glen English VK1XX]

Hi Warren

there is a 1 x ADC pin connected to the VIN yup. on odroid there are two 
analog pins available.

OK on the I/O.  alright, a single opto OUT and opto IN



On 30/01/2018 6:11 PM, Warren_Brown wrote:
> Hi Glen,
>
> I see you have included some I/O
> If it's not pushing the scope too much, could you include some interfacing for it eg, opto in and open collector transistor for out?
> Any chance of an AtoD for monitoring of the 12v supply?
>
> 73,
> Warren.
>
> -----Original Message-----
> From: OZAPRS [mailto:ozaprs-bounces at aprs.net.au] On Behalf Of Glen English VK1XX
> Sent: Tuesday, 30 January 2018 17:19
> To: ozaprs at aprs.net.au
> Subject: Re: [OZAPRS] IO PCB audio pTT etc
>
> Hi Matt
>
> excellent  ideas ! will do. OK on the computer watchdog. yep can do that to cycle power.  so if the linux stops you dont have to go to site ot sort it out.
>
> OK on FT230. and rs232 driver
>
> on the droid (maybe pi) (same pins header I think) there is a bunch of peripherals and another uart which I thought could TX to a uart display (or I2C), and RXD 3.3V from a 3.3V GPS chip. the interrupt input is on the pcb for 1ppm if desired...
>
> UPS of sorts. hmmm maybe a super capacitor. just needs ot go to an IRQ capable pin on gpio and halt
>
> How longup time- 100mS ?
>
> yeah BOM will be around $12
>
>
> On 30/01/2018 5:04 PM, Matthew Cook wrote:
>> Glen,
>>
>> 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 ?)
>>
>> 73
>>
>> Matt
>> VK5ZM
>>
>> On 30 January 2018 at 15:36, Glen English VK1XX
>> <glenlist at pacificmedia.com.au <mailto: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
>>      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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>>
>>
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