Using an Arduino and a smartwatch to measure liquid consumed from any container

Development of a mobile multi-device nutrition logger

“…Lessel et al [16] used a smartscale as a drink sensor for an app providing gamifications to motivate users to drink more. Soubam et al [22] presented a system that incorporates a smartwatch to detect drinking activity and a smartscale to measure the fluid amount. The prototypes bear some similarities to ours since there are not many design options when a load cell is being used as sensor.…”

“…Quite recently, many tutorials and necessary libraries -especially for Arduinos -can be found on the Internet. Two similar prototypes -also based on load cellshave been developed by Lessel et al [16] and Soubam et al [22].…”

“…The LEDs of the charger indicating the state can be seen from the side. These components are basically the same as used in the work by Lessel et al [16] and Soubam et al [22]. We didn't use a case printed by a 3D printer since those are often less stable which has been a problem reported by Lessel and colleagues.…”

“…26 Euro [16]) and the one by Soubam et al (ca. 22 Euro [22]) since some components are different. The battery lifetime of the prototypes can just roughly be compared since they use different components, but also transmission and power saving strategies.…”

“…The battery lifetime of the prototypes can just roughly be compared since they use different components, but also transmission and power saving strategies. The prototype by Lessel et al runs for about 31 hours [16], the one by Soubam et al for around 8 hours [22], but up to 20 hours with different settings. Our prototypes usually run for about 3 weeks permanently, but there is still room for improvement by adjusting software and hardware.…”