This upgrade-kit comes with all parts required to transform the sand clock into a laser writer.
This kit is a variant of Elektor’s earlier published sand clock. Instead of writing the time in a layer of sand, it uses a laser module to plot the time onto a piece of glow-in-the-dark sticker material. The afterglow time of this phosphorescent material varies with ambient light conditions. Best performance is achieved under normal room light.
The original design of the sand clock was modified to fit a laser module running on 3-5 V. A switch allows starting the time writing sequence at will rather than at a preset interval.
By the way, if you already have a sand clock and if you install the most recent software for this device, you can choose your own refresh lapse and add a button, so your sand clock writes the time just when you want.
For the Laser Time Writer, the arms of the pantograph mechanism were extended, enabling the sketch to write the time (or text) upside down.
Where necessary, the original sand clock software was adapted to the new hardware.
The upgrade-kit comes with all parts required to transform your sand clock into a laser writer: all acrylic parts assembled in a precut plate, glow in the dark sticker material, laser module, pushbutton and wire, brass spacer and small mounting hardware
The software for the Laser Time Writer is available as an Arduino sketch for download. For programming the Uno and first-time calibration of the servo motors you need a computer with the Arduino IDE installed. A detailed construction manual is available for download.
Remark: This kit was conceived as an upgrade for an existing Sand Clock.