Left is Wearable, Middle is Hub, Right is Receiver
Wearable pinout
Hub pinout
Receiver pinout
A normal resting heart rate is from 60 to 100 beats per minute (bpm) [1]. During exercise and during activations of the sympathetic nervous system (colloquially known as the fight-or-flight response), the heart rate will further approach one’s maximum heart rate. According to A. E. Meuret et al [2], Heart rate briefly peaks 40-50 minutes before the panic attack, drops back down to normal, and gradually increases until the panic attack occurs. We can use this information in order to predict a panic attack before it occurs and warn the user of it.
(Left is before and during a panic attack, right is regular rate with no panic attack)
Breathing rate is also affected by the sympathetic nervous system. It abruptly decreases by 1 breath/min ~45 minutes before the attack and returns back to normal around ~30 minutes before the attack [2]. We can use this information in order to predict a panic attack before it occurs and warn the user of it.
(Left is before and during a panic attack, right is regular rate with no panic attack)
Skin conductivity is affected by the activation of the sweat glands which can be exited by the sympathetic nervous system. It will be elevated by 2.5 points (micro-siemens) around an hour before the attack [2]. We can use this information in order to predict a panic attack before it occurs and warn the user of it.
The light intensity inverse squared law is I = S/(4pi*r) where S is the light intensity at the source (infrared emitter) and r is the radius away from the source. The design must ensure that the transmitted light is easily detectable by the detection mechanism and that the data carried by the light ensures the integrity of the source, that other people with not accidentally trigger it with their own infrared-emitting devices.