Logger specifications
| Logger: | |
|---|---|
| Power supply | Standard button-cell battery BR1225, 3V, 50 mAh |
| Battery life (continuous measurement duration) | Up to 3 months |
| Operating temperature range [2] | -20 to 60 °C |
| Sampling rate [3] | 12 Hz |
| Communication/Download | Serial RS232, using a dedicated interface device |
| Acceleration sensors: | |
| Measurement range | ±2 g (±20 m/s2) |
| Measurement noise | 5 mg (0.05 m/s2) |
| Resolution | 1 mg (0.01 m/s2) |
| Temperature sensor: | |
| Resolution | 0.07 °C |
| Measurement range |
Egg specifications
The following egg sizes are available. Prices shown in the list are total prices, which are driven mainly by the 3D-printing material costs. Besides material costs, the eggs require some additional manual labour. For instance, due to production tolerances, the egg halves not always fit to each other and additional sanding is required. All these costs are included in the price.
| Type nr | Height [mm] | Width [mm] | Shape | Image | Birds | Price [€] |
|---|---|---|---|---|---|---|
| 1 | 25 | 19 |  |  | 8 | |
| 2 | 52 | 37 | |  | Duck | 20 |
| 3 | 67 | 48 | | 24 | ||
| 4 | 55 | 37 |  |  | Godwit | 20 |
| 5 | 47 | 33 |  |  | Lapwing | 18 |
| 6 | 45 | 33 | |  | Teal | 18 |
| 7 | 100 | 65 | |  | Black swan | 68 |
| 8 | 75 | 55 | |  | Crowned crane | 43 |
| 9 | 30 | 23 |  |  | Turtle Dove | 35 |
Standard colors for the eggs are:
Battery life
The EggLogger is powered by a standard CR1225 3V Lithium battery (datasheet). This battery has a capacity of 48mAh. The average current consumption of the EggLogger is approximately 10µA (measured over a number of devices). The current consumption increases slightly if a lot of measurements are taken. But under normal circumstances, 10µA is a good estimate.
Given this current consuption, the battery can last approximately 4800 hours (over 6 Months). So, an EggLogger should, theoretically, be able to perform continuous measurements in a birds nest for more then 6 months. This is more then sufficient to bridge any incubation period.
Actual battery capacity has been measured. The figure below shows a typical measurement. As can be seen, actual battery capacity is even higher then the 48mAh specified and battery life may be beyond 7 months.
It is advised to start a new measurement with a full battery. A full, never used battery has a voltage of above 3V (usually close to 3.3V). When inserted in the logger, the battery voltage very rapidly drops to a voltage under 3V. This is shown in the discharge graph in the figure. This information can be used to select or inspect a battery before a new measurement. A battery with a voltage above 3V can safely be assumed to be full. Batteries with a voltage below 2.5 V should never be used for any new measurement. Below 2V, the battery can be assumed to be empty. Above 2.5V, the battery can be used for short measurement periods of a couple of weeks.
