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README.md
cordwood-three.fzz

README.md

#411 cordwood-three

Custom build of the Boldport Club Cordwood Puzzle III, Project #25, May 2018, with an archway layout and a spring-loaded LED trigger machanism.

Build

Here's a quick demo of the build on a custom test jig "LED Blinky Machine"..

clip

▶️ return to the LEAP Catalog

Notes

This is the third Boldport Club project in the Cordwood series. See my build of the first and second. Here they are all together:

cordwood_series

The Kit

The kit arrrived in the familar brown paper

kit_arrival

kit_parts

If you want to build this kit, the easiest way is to join the club and order the BoldportClub kit. But you could do it without the kit: the PCB design is open source so it is relatively easy to make an identical (or similar) set of boards, and the parts are relatively easy to obtain:

Qty Original Part Mouser Equivalent
x6 220Ω 2W resistor, Multicomp MCF 2W 220R 603-RSF2WSJR-52-220R
x6 10KΩ 2W resistor, Multicomp MCF 2W 10K 588-OY-10K-E
x6 MOSFET n-channel transistor, Fairchild 2N7000_D26Z 512-2N7000
x1 1µF ceramic capacitor, AVX SA305E105MARC 80-C440C105Z5U-TR
x6 10mm green LEDs, Kingbright L-813GD 696-SSLLX100133SGD
x1 25mm M3 female-female standoff, ETTINGER 05.03.251 761-M1272-3005-SS
x1 25mm M3 female-male standoff, ETTINGER 05.13.251 761-M2120-3005-SS
x2 M3 screws, DURATOOL M38 CSSTMCZ100-
x1 10-pin 2.54mm header, Multicomp MC34739 710-61301011121
x5 6cm of 20AWG wire

Schematic

The circuit is similar to the other cordword projects: essentially an array of LEDs with low-side NFET switches. By default, the LEDs are on with a pull-up resistor on the MOSFET gates. The gate is exposed via pin header so it can be pulled low (turning off the LED).

Schematic

Construction

The conventional construction is a vertical stack. The Boldport guide outlines the construction:

conventional_layout

I played around for a bit looking for alternatives, and settled upon an archway style which I found quite appealing;-)

build-side

So that's working fine - I can toggle the LEDs by pulling any of the 6 gate pins low.

build-powered

Here are my working notes for re-arranging the connections...

custom_layout

A Custom Test Jig - LED Trigger Machine

So without getting too fancy, I wanted a nicer way of mounting and testing the project. One thing lead to another, and soon I had a completely pointless LED blinking machine:

  • I used the box from The Boldport Gent project as a base
  • 4 x AAA in the box
  • power switch
  • and a spring-loaded trigger mechanism for blinking the LEDs

Build

Close up on the trigger machnism - a bit of ad-hoc wire craft and a spring:

cordwood-three_build-trigger

Power and switch connections inside the box:

cordwood-three_build-power

Side view..

cordwood-three_build-side

Credits and References