[DisasterRadio] Next Dev Board

[Rafael Betancourt]

John,

I would be happy to review your PCB schematic and layout. What kind of
material are you planning to use? Usually FR-4 is not suitable for RF ~1
GHz as impedance is not well controlled.

For future versions, there is an intermediate step between a module and a
full custom ASIC (see https://www.zglue.com).

Cheers,

Rafael


Rafael J. Betancourt, IEEE Senior Member, TEMS-SCV Vice-Chair |
betasoft at ieee.org | 650.224.6849

On Tue, Nov 13, 2018, 11:13 PM John Fitz <johnfitzeecs at gmail.com wrote:

> Hi all,
>
> So definitely going for ICs on board rather than modules for this next
> build. The cost savings are just to great:
>
> ESP32 $2.6 per IC vs $3.7 for module = savings ~$1
> LORA $3 per IC vs $9 per module = saving ~$6 x 2 = $12
> CN3791 + passives ~$1  vs $3.5 per module = saving ~$2.5,
>
> I believe as long as we don't advertise, we can sell uncompleted boards
> for home use without FCC Certification (per FCC Part 15.23).
> <http://www.gpo.gov/fdsys/pkg/CFR-2010-title47-vol1/pdf/CFR-2010-title47-vol1-sec15-23.pdf>
>
> Nico: I'll definitely have pinouts for a DHT22 sensor and much more.
> Rafael: A schematic/board review would be a great help. I'll notify
> everyone when the board is ready for review. Maybe we can try and integrate
> everything onto an IC one day...
> leez: we'll definitely have to do some power consumption/efficiency
> testing with new boards. Maybe we can integrate power monitoring with the
> lora mesh.
>
> The new board is located in the repo here (
> https://github.com/sudomesh/disaster-radio/tree/master/hardware/board_v4
> ),  please let me know if anyone has issues opening the board in KiCAD,
>
> -Fitz
>
>
> On Tue, Nov 13, 2018 at 11:53 AM Morgan Allen <morganrallen at gmail.com>
> wrote:
>
>> Awesome! Glad to hear about the switch to ESP32.
>> I've already been putting in a lot of work developing an SX127x driver
>> for this chip.
>> https://gitlab.com/morganrallen/esp32-lora
>> Feel free to bug me for any direct support if that gets used (or even
>> arduino-LoRa, I'm a co-maintainer on that)
>>
>> Going to attempt to swing by tonight.
>>
>> On Mon, Nov 12, 2018 at 8:34 PM John Fitz <johnfitzeecs at gmail.com> wrote:
>>
>>> Hi all,
>>>
>>> I finally have some free time to work on the next Disaster-Radio dev
>>> board. Before I get started, I wanted to double check the major components
>>> with everyone:
>>>
>>> * ESP32
>>> * 2x LORA IC
>>> * SD FLASH CARD
>>> * CN3791 MPPT solar charger
>>> * 18650 LiPo Battery
>>>
>>> I'm considering ditching modules for this next build and using IC's
>>> directly on board for the ESP32 and Lora IC:
>>>  * ESP32 -
>>> https://lcsc.com/product-detail/RF-Transceiver-ICs_Espressif-Systems-ESP32_C80134.html
>>>  * LORA -
>>> https://www.digikey.com/product-detail/en/semtech-corporation/SX1273IMLTRT/SX1273IMLTRTTR-ND/5226771
>>>
>>> This will definitely lower costs and allow a bit more flexibility. I'm
>>> not sure if the RFM95 is available directly as an IC. Is there any issue
>>> with using the SX1273 instead?
>>>
>>> I'll be at hardware hacking tomorrow night too, if anyone has any ideas
>>> or wants to brain storm.
>>>
>>> -Fitz
>>> _______________________________________________
>>> DisasterRadio mailing list
>>> DisasterRadio at lists.sudoroom.org
>>> https://sudoroom.org/lists/listinfo/disasterradio
>>>
>> _______________________________________________
> DisasterRadio mailing list
> DisasterRadio at lists.sudoroom.org
> https://sudoroom.org/lists/listinfo/disasterradio
>
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