Lowest-Cost Communication with Light

ELPRO Buchs AG with their "Libero" series of trackers is a leading provider of transport monitoring devices for temperature sensitive goods like pharmaceuticals during shipment from the manufacturer to the final user. These devices are typically packed with a full box of goods and communicate their tracking data over USB.

To track small packages or vaccine doses, ELPRO wanted to develop a much smaller and cheaper device that basically consist only of a battery, a mixed-signal ASIC, a single button and 3 LEDs (green, yellow and red) to indicate, whether the cool chain was maintained or whether the medication is no longer safe to use..