I've designed a basic IoT architecture to measure biosignals. I am not an expert in the field so I have doubts in basic battery consumption calculation and considerations.
The proposed system consists of:
- Box: Contains bluetooth (15mA) and 5000mAH Li-on battery. 3.8V.
- ECG Sensor with 12.5mW power dissipation.
- Three accelerometers. 2mA consumption.
- Oximeter with 4.8mW power dissipation
The calculation that I've done so far is (the 3 is because the amount of time, 3 hours):
Battery consumption in 3 hours = 0.015 * 3 (bluetooth) + 0.0048/3.8 * 3 (ECG) + 3 (accelerometers) * 3 hours * 0.002A each + 0.0048/3.8 * 3 (oximeter) = 0.077A = 77 mA battery consumption each 3 hours.
I am pretty sure that I am missing something and that some considerations are not included.
I need to get continuous information from the sensors because is for monitoring user activity and I can't build a prototype.