> The device takes its measurements by shooting an electrical current into the skin and then analyzing the body’s response, which is known as bioimpedance.
I thought this would be a passive sensor, but this makes it seem like it's not. Is the electrical current produced "wirelessly" using an electromagnetic field (radio), as in those batteryless sensors? The article makes no comment on how this would work practically.
From what I understood the thing described in article are more or less fancy electrodes. You still need the usual electronics, PCBs and powersource to do the actual measurement. So without developing sufficiently small and flexible electronics, battery, and electrodes for connecting the electronics to the rest of e-tatoo you don't get anything of the promised unobtrusive, continuous measurements. As usual press release is dreaming big when only small fraction of the problem is solved.
I thought this would be a passive sensor, but this makes it seem like it's not. Is the electrical current produced "wirelessly" using an electromagnetic field (radio), as in those batteryless sensors? The article makes no comment on how this would work practically.