A DCC Accessory Decoder to drive four standard servos - based around an Arduino Nano 3 module and incorporating facilities for the precise manual adjustment of all servo throws (as well as via programming of configuration variables (CVs)). This updated version can be powered from a separate Accessory power bus, instead of directly from the DCC track, to reduce the load on the DCC Command Station or Power Booster. Further details at A-Train Systems, Projects (https://www.a-train-systems.co.uk/download.htm#Projects)

uprog2: Universal Programmer for Linux

Programmer firmware and software designed and developed by Jörg Wolfram. http://www.jcwolfram.de/projekte/uprog2/main.php. https://www.mikrocontroller.net/topic/411643

The software and schematic are licensed by Jörg Wolfram as “GPL (GNU General Public Licence) Version 3”

Schematic files, Gerber files and Bill of Materials can be found at https://github.com/5inf/uprog2

Replaced AK9754 with LSM303AGR.

Swapped CCS811INT and CCS811 WAKE to conform with new Katydid pin map.

An Arduino Shield for the Grid SRAM project (https://github.com/DragonMinded/gridsram). Its recommended that you use sockets for all 7400 logic, as well as (obviously) a socket for the SRAM chip. That way, you don’t risk burning out the chips when soldering. There is limited clearance under the board for things like the Arduino USB and the ICSP header. Make sure you snip protruding pins on the bottom side as flush with the board as you can.

BOM:

1x 32 pin DIP socket (https://www.mouser.com/ProductDetail/437-1108763241001101/)

4x 14 pin DIP socket (https://www.mouser.com/ProductDetail/575-1154731441001000/)

1x 74HC00 DIP chip (https://www.mouser.com/ProductDetail/595-SN74HC00N/)

3x 74HC164 DIP chip (https://www.mouser.com/ProductDetail/595-SN74HC164N/)

1x Schottky Diode (https://www.mouser.com/ProductDetail/583-1N5817-T/)

5x 0.1uF ceramic capacitors (https://www.mouser.com/ProductDetail/810-FA28X8R1E10400/)

1x set of arduino stackable headers (https://www.adafruit.com/product/85)

(Mostly) drop-in replacement for the NE558 quad timer using four 555 timer chips. Pins are Mill-Max 0542-0-00-15-00-00-03-0

If you order a set of these, please consider buying me a coffee
Improved rev 3! (not tested yet - order at own risk) order as a flex PCB (or at most 0.8mm regular PCB) for best fit. Intermediate board to allow a drop-in replacement of an improved RGB video encoder chip CXA1645 in place of the usual CXA1145 on Amiga A600/A1200 models. Resistor/Capacitor sizes are all 0603 and the values are listed on the silkscreen. The 16K R needs to be a 1% tolerance (or accurately tested) resistor and Y/C connections are broken out for S-Video mods to be attached (extra 75R + 220uF RC components needed in line with each) This may be applicable to other uses of the CXA1145 if it’s the same SMD package as the Amiga variant and there is sufficient space around the ends for the passive components.

Solder jumper should connect center pad to VIN. 9-pin connector: DigiKey P/N 455-1809-2-ND Pin header is 0.1" pitch; I recommend right angle socket header, mounted on the side of the silkscreen illustration.