I've been working on a compact field deployable lighting effects rig. Based on bike brake discs makes them really tough and easy to attach to ropes and cable ties. They can be daisy chained with a single IP68 connector providing both power and data.
A layer of clay between the WS2812 PCB and the brake disc allows the disc to act as a heatsink.
The control model is loosely based on an audio synthesizer - in the sense that there are various properties to change live that interact to produce different effects.
Small thermal printers commonly used for printing receipts have become more affordable and can be useful for all sorts of projects like interactive exhibits, custom Point Of Sale system or just printing notes.
The ESC/POS specification can be found in this document from EPSON however the functionality actually implemented in each model of printer varies.
This ZJ-5802LD printer from ebay can be connected with USB, serial or Bluetooth and contains a lithium battery allowing printing from mobile phones or tablets in the field.
This example implements all the text functionality of the ZJ-5802LD printer and produces the output shown above. We are connecting the printer using the USB port which is presented as /dev/usb/lp0 in Linux.
In a future post I will cover printing barcodes and images.
This is an early stage of a boat design. It mixes ideas from both kayaks with outriggers and from sailing catamarans. The idea is to make a boat that is good for both paddling and sailing and can be packed up to the size of a very large suitcase.
The two outriggers provide all the buoyancy and the tiny cabin in the middle fits one person with their legs stretched out.
The sparse connection between the cabin and outriggers is to allow decent room for paddling (the red stick).