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A page to dump research links & info that don’t exactly belong to the other two pages.

TX16 V2 schematics (attached below): Could try to decipher these to verify TX16 to Gemini PCB connection.

Gemini PCB Firmware (Github): https://github.com/JyeSmith/ExpressLRS/tree/gemini Good place to look at for firmware for the Gemini PCB, it’s basically a fork of the ELRS GitHub with the Gemini firmware (the ELRS GitHub has merged it mostly, but it might be easier to find/pick apart from here)

ELRS Setup Guide (https://oscarliang.com/setup-expresslrs-2-4ghz/#ExpressLRS-24GHz-Hardware-Selection ): A comprehensive guide to setting up and flashing firmware to setup ELRS on a radio transmitter. Following this guide is very helpful for understanding how firmware is supposed to be uploaded to the transmitter board

ELRS Update Guide (https://www.expresslrs.org/quick-start/transmitters/updating/#manual-upload-via-local-wifi ): More in depth guide for updating a TX over UART and WiFi, can give more info/context not given in the guide above

The following are measurements taken with a caliper of the JR bay on on the TX16

Fan Candidates

https://www.amazon.com/Raspberry-Controllable-Control-Fan%EF%BC%8CRaspberry-40x40x10mm/dp/B0C4PN9BHK?source=ps-sl-shoppingads-lpcontext&ref_=fplfs&psc=1&smid=A5CVPLET1CA6

Best Fan Candidate

4 pins (5V, GND, PWM OUT, TACHO IN)

Claims 250mA max

https://www.amazon.com/Noctua-Cooling-Bearing-NF-A4X10-FLX-5V/dp/B00NEMGCIA/ref=d_pd_pss_dp_d_1_sccl_2_1/131-4794042-8775400?pd_rd_w=N46Zi&content-id=amzn1.sym.3dd6ff5f-e1b5-4c4b-9429-39c9f308776c&pf_rd_p=3dd6ff5f-e1b5-4c4b-9429-39c9f308776c&pf_rd_r=TGEQXVW5BY2A89NEMS3F&pd_rd_wg=fbnX7&pd_rd_r=19140b40-0674-4be5-ab82-24e65d06cee8&pd_rd_i=B00NEMGCIA&th=1

9 Pin Locking Connector

PCB connector

https://www.digikey.com/en/products/detail/molex/2023960907/7785664?s=N4IgjCBcoLQBxVAYygMwIYBsDOBTANCAPZQDaIAnAAxUD8ArgC4C2A%2BtkfQE5K4C81KiAC6AX1GEATGRCSqkgMwUAbFWoB2EaKA&utm_campaign=buynow&utm_medium=supplier

Wire connector

https://www.digikey.com/en/products/detail/molex/5013300900/1531506

  • Good stock (20,000+ on each item)

  • 9 Pos

  • SMT, right angle mounted

  • Locking

  • Molex

LDO Selection

LDO is rated for 1A minimum and 1.3A typical? The 800mA is the current at which the dropout voltage is measured at, and for that there's a plot on page 8 of the datasheet that shows <1.4V dropout voltage at all temperatures at 1A output, so with a 5V input we should be in the clear. Based on that I'm going to leave the LDOs in, as even the minimum rating clears the absolute maximum of the ESPs

ESPs draw 500mA tops each

We should be in the clear with these 1.3A typical LDOs

Chip Antennas

Reference Designators

Mounting Grid

Board mounting holes are currently 90mm by 60mm which allows it to be mounted on a 30mmx30mm scheme that is standard in WARG. A future board revision may aim to move many components inwards and bring the board edge up to the connectors for aesthetic and board size optimization.

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