I’ve just done some current draw tests on our EMX and G120 boards, with interesting results. The boards are basically identical, except for the modules. They have a 16x2 LCD with back-light, microSD card, Hi-Res A-D chip, voltage reference and a couple of LEDs.
Tests were done with LCD back-light at around 25%, LEDs off.
Running identical code and current SDK.
EMX (running) 170mA
EMX (hibernate) 28mA
G120 (running) 179mA
G120 (hibernate) NA (crashes)
Surprising, as I thought the G120 was going to be faster and use less power, while it actually seems marginally slower and consumes slightly more power.
We use a 4000mA lithium cell and a LDO linear regulator (switchers don’t work in our magnetic field), so assuming we can get approximately 50% capacity out of the cell, we should get around 11 hours runtime, or 70 in hibernate. Just have to get the G120 to hibernate now.