I would like to constantly save data coming from sensors (for an activity tracker) while consuming as less battery as possible (I'd like to have a 4/5 days autonomy on a 3000 mAh battery) but I can't find the best way to save about 2 kBytes/s on a memory large enough to contain several days of data.
Sensors would be read at a rate of 20 times per second and produce about 100 bytes each time.
What options do I have in order to:
- store such an amount of data (hardware)?
- ensure the system can work properly with required autonomy?