[DisasterRadio] Next Dev Board

John Fitz johnfitzeecs at gmail.com
Tue Nov 13 23:13:20 PST 2018

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).

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 (
),  please let me know if anyone has issues opening the board in KiCAD,


On Tue, Nov 13, 2018 at 11:53 AM Morgan Allen <morganrallen at gmail.com>

> 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
>> * 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
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