argh obviously sch and brd to pcb extensions.

http://www.lrlabs.net/hams/sm1002.sch
http://www.lrlabs.net/hams/sm1002.brd


Leon Lessing
雷立安
ZS6LMG/AC9GU



On Sat, Mar 10, 2018 at 4:38 PM, Leon Lessing <zs6...@gmail.com> wrote:

> I should have rephrased it, the SM1002 :)
>
> I looked at this canbus thing and I thought to myself "self this is
> trouble" so canbus no more, only modbus, very creative rx/tx switching, can
> bite you in the backside though.
> The board is getting very big, as I have the hotspot design for the pi
> hat, I am going to panelbeat that into a modbus unit, and there we have a
> gmsk, 2fsk and 4fsk radio.
> I used molex 43025/43045 connectors for the rs485 and for the audio,
> wanted to use a db9 but it just takes too much space, I am a bit worried
> with my long audio wires.
> I the lower right I am thinking of sticking a rj45 conenctor block for a
> universal mic interface like the original SM1000.
> I have no plans for a speaker and mic in it.
> The gps is packed, a quectel M70 device with a ufl connector, maybe sma
> esge connector is better.
> the esp8266 is another carrier board that I have to fit any of the
> available units, in South Africa our regulator is full of crap with type
> approvals and the only module I can find with CE certification is the
> wireless tag technology modules. So I made a carrier to test various
> modules, the ai thinker seems to have fcc, but I cannot get CE
> documentation from them, same with their A7 and A9 gsm modules.
>
> Is there anybody that wants to look at the pcb before I start packing it,
> the sch and pcb files are in eagle 7.7 format. I cannot get my head around
> this kicad thing, it is probably me, but with 18+ years on eagle and before
> that 15+ years on pcad it is probably understandable.
>
> http://www.lrlabs.net/hams/sm1002.pcb
> http://www.lrlabs.net/hams/sm1002.pcb
> http://www.lrlabs.net/hams/sm1002s.pdf schematic
> http://www.lrlabs.net/hams/sm1002p.pdf current pcb overlay
>
> Please post any blatant blunders.
>
> Leon
>
>
> Leon Lessing
> 雷立安
> ZS6LMG/AC9GU
>
>
>
> On Sat, Mar 10, 2018 at 7:25 AM, Steve <coupaydevi...@gmail.com> wrote:
>
>> I seem to remember the SM1000 CPU was replaced with a version without
>> CAN after the first batch.
>>
>> On Fri, Mar 9, 2018 at 11:06 PM, Leon Lessing <zs6...@gmail.com> wrote:
>> > Hi All,
>> >
>> > Should I break out a serial port for modbus or canbus, I have a love
>> hate
>> > relationship with can, but it is good at arbitration better than
>> modbus. The
>> > main advantage is that canbus can do 500kbits/s and more.
>> >
>> > Modbus is easier to implement even a attiny85 can run it.
>> >
>> > Ideas?
>> > I currently have a 75176 and a L9615 on the pcb, but stm was clever in
>> > putting can on pb5 and pb6 and usart1 on pb6 and pb7, that chip designer
>> > surely has a mean streak. both chips will need a level translator
>> (txb0102),
>> > I do not trust the 5V tolerant thing at all, been bitten more than once
>> with
>> > that.
>> >
>> > Leon
>> >
>> >
>> >
>> > Leon Lessing
>> > 雷立安
>> > ZS6LMG/AC9GU
>> >
>> >
>> >
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>
>
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