It’s been a busy few days building and testing a fresh batch of six, new Light Log prototypes. They are almost all ready to ship out to their new homes, needing only some changes to the 3D printed enclosure (these are a little smaller than the last version), an update to their firmware (improved UI and timing accuracy), and calibration against known light lux sources.
Five will be off to Nigel A. Beacham, whom I met and chatted with at last year’s Northern Lights Conference. He’s a Research Fellow at Aberdeen University setting up a pilot study investigating the effect of light during informal learning periods. The sixth prototype will be winging its way to Talia Radford, a social product designer based in Vienna. She heard my Light Log presentation at the Wearable Futures conference back in December and is looking to include the electronics in her latest wearable project for the Milan Design Week in April.
The electronics are now down to 28mm x 28mm x 14.5mm in size (with a couple of millimetres added once you include the thickness of the 3D printed enclosure), and weigh 11g (14g with the battery). Each device uses two circuit boards stacked one above the other. One holds the micro-controller, memory, sensors for red, green, blue and clear (for low light conditions), with a white LED and tactile button providing a simple user interface for the front face. The second board holds the battery and serial communication components for downloading logged light data to your computer.
If you’d like to see the circuit schematics, component part-list, or perfboard layout (a type of circuit board designed for prototyping circuits), you can find them on the Light Log GitHub repository, along with other documentation. With the small size of these devices it does now need a little patience to build, perhaps an afternoon’s work, with the trickiest part soldering in the link wires.
I’m looking forward to seeing these prototypes fly from the nest later this week!