Yesterday the second version (V1.1) PCBs arrived so I was able to [almost] fully assemble a proper reagent tracker.

I made a couple of user interaction tweaks to improve feedback to the user though the LED as a result, but here's a video of the tracker in use.

When the bottle is placed on the tracker it flashes the LED and plays the wake tune.

When the bottle is identified it flashes briefly to let the user know it is measuring the weight (it's a little slow to let the scale settle and get a reliable weight).

Once the bottle is weighted the LED lights solid until the bottle is removed, a reliable zero weight is obtained and the measurement published to the internet.

This tracker is made from FormLabs clear resin and coated with clear epoxy (and was that messy!)