Shared Projects by Cereal_Killer

slot take 2, with help from Dan Sheadel

The vias are placed so you can file this 30mm board down to 29mm and not be cutting into the vias at all. 8mm exposed spring pad, mask can be scraped to expand it to a 10mm pad if needed. -Dan

The vias are placed so you can file this 29mm board down to 28mm and not be cutting into the vias at all. 8mm exposed spring pad, mask can be scraped to expand it to a 10mm pad if needed. -Dan

RECOMMENDING ORDERING V2 BOARDS HERE: https://oshpark.com/shared_projects/lxP339Oa

21mm FET+1 board, designed specifically for an old light that you cant even buy anymore but it’s a common size so I shared it if you want to build it w/o the switch and AUX 5mm LED (you can wire you own switch wires and AUX LED) Build FW for GT_Mini target.

v1.01 (this board supersedes v1.0)

            NEW FOR VERSION 1:

-Improved silkscreen and labeling!

-Improved .sch!

-All silk readable w/o magnification!

-I’m still using a 4x4SMD tact button but now nearly any switch you can find will work with a little solder mask scraping!

-Provisions for >3S battery input!

If you want to run over 3S you have a new option- dont put the LM317 and it’s associated components on the board, instead use a UBEC (such as a Poloulu) and supply the board with 6V direct at the 2-pin input (upper right corner opposite antenna) and close the solder jumper on the right two legs of the LM317 (SJ1), when you do this STOP APPLYING POWER ON THE VIN PIN! DONT FORGET THIS STEP, YOU MUST REMOVE POWER INPUT FROM THE SIG/VIN/GND CONNECTOR! This will run the entire board (including arduino & Hope RF module) at 6v from any voltage your chosen UBEC can accept. (If you dont close the jumper the arduino will continue to receive it’s RAW power from the main source then you can use your own voltage supply for the Hope RF module, effectively making it run at any power level you wish. This also makes it easier for people who dont want to source LM317’s and have other LDO’s laying around). This method provides easy provisions for two groups of users, those wanting to independently supply the voltage to the Hope RF modue (either cause they have another type of Vreg and dont want to buy LM317’s or maybe because they want to adjust the power output on demand), it will also provide a easy way to run it on higher voltage systems (the reason I needed it)

All 0805 size components (including LEDs). All component values are marked on the silkscreen except for C4 and C5, please decide if you want to use them and choose appropriate values based off the datasheet

Project links:

Discussion thread @ RCGroups

Official .sch

LM317 datasheet

ATTN: You MUST file / sand the edges of the Arduino mini down so they essentially become board edge vias. Dont worry, this process is very simple and makes very clean looking edge connections that are very easy to solder with very minimal work. Quickly sand / file the board edges down about 2/5 of the way threw the vias.

Note In the project thread on RCGroups I have pictured of built boards I’ve completed using a very strange Arduino Pro Mini clone with a double row of pins at the bottom for SPI and A4-A7, please DO NOT BE CONCERNED that you cant find that specific arduino clone, the pins needed for Ultimate LRS mini are all 1-to-1 compatible with the standard Arduino Pro-Mini and all it’s exact clones. Pretty much any 328p mini board you find will work and ULRS is using the most common pins that are [even on boards with slight differences] always in the same spot!!