14 Nov
2018
14 Nov
'18
8:01 p.m.
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(a)ieee.org | 650.224.6849
On Tue, Nov 13, 2018, 11:13 PM John Fitz <johnfitzeecs(a)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(a)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(a)gmail.com> wrote:
DisasterRadio mailing list
DisasterRadio(a)lists.sudoroom.org
https://sudoroom.org/lists/listinfo/disasterradio
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_…
* LORA -
https://www.digikey.com/product-detail/en/semtech-corporation/SX1273IMLTRT/…
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
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