Commit 4ab656f0 authored by Grace Copplestone's avatar Grace Copplestone

Update README.md

parent ac28fcfe
......@@ -23,27 +23,26 @@ The nRF52832 draws 5mA peak @ 3.3V
The Hall Effect Sensor draws xmA @ 3.3V
Assume whole device runs at peak load for 5% of the time
P = IV = 5e-3 * 3.3 * 0.05 = 0.825 mW
1 Wh = 1 watt for 1 hour
0.825 mW for 365 days = 7.2 Wh
E [wh] = (Q [mAh] * V [V])/1000
```math
P = IV = 5 * 10^{-3} * 3.3 * 0.05 = 0.825 mW
```
```math
1 Wh = 1~watt~for~1~hour
```
```math
0.825~mW~for~365~days = 7.2 Wh
```
```math
E [Wh] = (Q [mAh] * V [V])/1000
```
```math
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.
An Alkaline AA battery can supply 1.5V with a capacity of 1800–2600 mAh
(Haven't found a good way to embed maths equations in the README and have them render in the Project page of the repo, there's http://www.sciweavers.org/free-online-latex-equation-editor and http://latex.codecogs.com/ but they require editing the equation through their website.)
This is on a separate line
```math
a^2+b^2=c^2
```
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