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correct energy consumed per day calcs

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Glyn Hudson 2016-11-13 13:25:31 +01:00
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sensor/readme.md
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@ -13,10 +13,10 @@
| Sleep Current | 0.02uA | 0.06uA | 15uA | 750 times less power | 0.1uA - 0.3uA |
| Measurement Current | 0.045mA | 0.09 mA | 0.5mA | 11 times less power | 0.714mA - 0.350mA |
| Measurement time | 0.01s - 0.0026s | 0.01s - 0.0026s | 2s | 200 times faster | 0.013s |
| Energy consumed per sample | 1.5uJ | 2.97uJ | 3300uK | 2000 times less power | |
| Energy consumed per sample | 1.5uJ | 2.97uJ | 3300uJ | 2000 times less power | |
| Time sampling per day* | 14.4s || 2800s | | |
| Time sleeping per day* | 86386s || 83600s | | |
| Energy consumed per day* | 2.36mW [1] || 2836mW [2] | 1201 times less energy per day! | |
| Energy consumed per day* | 7.8mJ [1] || 8700mJ [2] | 1115 times less energy per day! | |
```
energy consumed (joule, J) = potential difference (volt, V) × charge (coulomb, C)
@ -26,10 +26,12 @@ energy consumed (joule, J) = potential difference (volt, V) × current (ampere,
## Energy consumed per day*
- **HTU21D:** (14.4s * 0.045mA) + (86386 * 0.00002mA) = 0.63mW + 1.73mW = **2.36mW** [1]
- **DHT22:** (2800s * 0.55mA) + (86386 * 0.015mA) = 1540mW + 1295.8mW = **2836mW** [2]
Energy consumed per day = energy consumed per sample + energy consumed while sleeping.
\*Assuming 1 sample per min and sleeping in between samples, 1440 min per day = 86400s per day
- **HTU21D:** (1400 * 0.0015mJ) + (3.3V * 0.00002mA * 86386 ) = 2.1mJ + 5.7mJ = 7.8mJ [1]
- **DHT22:** (1400 * 3.3mJ) + (3.3V * 0.015mA * 83600) = 4.6mJ + 4.1J = 8.7J = 8700mJ [2]
\*Assuming 1 sample per min and sleeping in between samples: 1400 samples per day
[Adafruit HTU21D Library](https://github.com/adafruit/Adafruit_HTU21DF_Library)