Reduce power consumption and heat

[aditydcp]

          Data collection is working, but not function completely correct.

A run using all 3 PPG running concurrently may only go for about 100-200 seconds before the smartwatch went overheat.
(I'm pretty sure this run goes for 216 seconds, but the duration recorded and the data count on PPG Red and IR are all different (probably the PPG Red and IR stopped working at around 100 seconds without me noticing))
The smartwatch is still physically safe, no damage to my skin on this run, but the watch turns itself off to cool off for a bit.

This pose a problem as PPG Red and IR are the ones with high enough frequency to barely match the HRM frequency. An effort to reduce power consumption and heat needs to be worked on.

Originally posted by @aditydcp in #7 (comment)

[aditydcp]

working on dimming the screen.
reference:
https://developer.android.com/training/wearables/views/always-on

[aditydcp]

using foreground service and enabling ambient mode on the wear module allows it to stay on for a little bit more. longest attempt hold out up to ~543000 data taken, (Even though this translates to 543 seconds of run, the actual run time is longer because of a lag in the PPG IR and Red capture rate) which should be enough for this research's purpose

[aditydcp]

One other problem is how my phone just froze throughout the recording session.
Tried to hide the plots, but the freezing persists. It is to be expected though, because all the underlying mechanics are still going.
It's not a breaking problem though, as the app still receives the data from wear module, just take a long time to visually appear.
Might be because of not enough power on my phone.

One solution I can think of right now is using a remote server to store the data instead of using the phone. But might need to search for a free option.