Minimize power consumption

[mortenfyhn]

The entire device (measured on battery input at 4.1 V):

• Active: 50-60 mA
• Sleep: 0.5 mA @ 4.1 V = 2.05 mW

The load cell + amplifier (measured on 3.3 V line):

• Active: 10 mA
• Sleep: 0.0 uA

The displays (measured on battery line at 4.1 V):

• Active: 50 mA
• Sleep: 190 uA @ 4.1 V = 0.78 mW

The push button uses a small amount of power when pressed and nothing when not pressed.

So where is the remaining 1.27 mW going?? An 328P in deep sleep shouldn't use nearly that much.

Standby: 0.5 mA gives around 100 days. Usage: 50 mA gives around 24 hours. So if I use it, say, twice a day, 5 min brew + 5 min timeout each time, that's 20 minutes usage per day + 1420 minutes standby. That's 16.7 mAh (usage) + 11.8 mAh (standby) = 28.5 mAh -> 42 days, assuming 1200 mAh battery. Very back of the envelope.

[mortenfyhn]

• [ ] Do the displays use more power in standby because they're hooked up to the battery line instead of the 3v3 line?

[mortenfyhn]

The TM1637 driver has a parameter bool on. I wonder if the power consumption is changed by this, when all segments are off:

https://github.com/avishorp/TM1637/blob/82214be06742bf187fab4f29aaabb64c289eaae0/TM1637Display.h#L49-L51