Commit 4d3d7287 authored by Grace Copplestone's avatar Grace Copplestone

Update README.md

parent 42263602
...@@ -25,9 +25,13 @@ The Hall Effect Sensor draws xmA @ 3.3V ...@@ -25,9 +25,13 @@ The Hall Effect Sensor draws xmA @ 3.3V
Assume whole device runs at peak load for 5% of the time Assume whole device runs at peak load for 5% of the time
P = IV = 5e-3 * 3.3 * 0.05 = 0.825 mW P = IV = 5e-3 * 3.3 * 0.05 = 0.825 mW
1 Wh = 1 watt for 1 hour 1 Wh = 1 watt for 1 hour
0.825 mW for 365 days = 7.2 Wh 0.825 mW for 365 days = 7.2 Wh
E [wh] = (Q [mAh] * V [V])/1000 E [wh] = (Q [mAh] * V [V])/1000
Q = (1000 * 7.2)/3.3 = 2181 mAh Q = (1000 * 7.2)/3.3 = 2181 mAh
The CR2477 is one of the largest coin cell batterys (20mm diameter and 4.7mm thickness) and has a capacity of ~1000 mAh. The CR2477 is one of the largest coin cell batterys (20mm diameter and 4.7mm thickness) and has a capacity of ~1000 mAh.
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