A) Components selected :
The main motherboard responsible for performing the calculations, the choice is the Fox board Board G20
His features
| Power |
+ 5 Volts |
|
Consumption |
60 mA |
| Processeur | ARM9™ AT91SAM9G20400 MHz d’Atmel™ |
| Memory | 64mbyte@ 32bit 133MHZ |
| I/0 | – 28 portsd’entrées/sorties
– 2 ports série (niveau 3,3 V) – 4 entrées de conversion “A/N” – bus I2C™ / SPI™ – Sortie PWM |
The GPS is the MediaTek MT3329
His features
| Channels | 66 channels |
| Sensitivity | -165dBm tracking |
| Maximum update rate | up to 10Hz |
| Dimension? | 16mm x 16mm x 6mm |
| Position Accuracy | Position Accuracy |
| Cold Start | under 35 seconds (Typical) |
| Warm Start | under 34 seconds (Typical) |
| Hot Start | under 1 second (Typical) |
| Low Power Consumption | 48mA @ acquisition, 37mA @ tracking |
| Low shut-down current consumption? | 15uA, typical |
The magnetometer is the HMC5843 three axes:
|
Alimentation |
voltage of 2.5-3.3VDC |
|
Sorties |
|
|
Dimensions |
0.5×0.5″ (12.7×12.7mm) |
|
Alimentation |
|
|
Consommation |
|
|
Résolution |
|
|
Précision |
|
|
Filtrage |
|
|
Sorties |
I2C interface |
The accelerometer is the ADXL335
His features
| Dimensions | 4 mm × 4 mm × 1.45 mm LFCSP |
| Sensing | 3-axis sensing |
| Consommation | Low power – 350 ?A (typical) |
| Excellent temperature stability | |
| Single-supply operation1.8 V to 3.6 V |
Communication is based on XBee
|
Alimentation |
+ 3.3 Volts |
|
Consommation |
210 mA |
|
Puissance |
50 mW (+17 dBm) power output |
| Point-to-multipointnetworking ideal for low-latency applications
Support for large, dense networks128-bit AES encryption RPSMA connector Industrial temperature rating (-40° C to +85° C) Advanced mesh networking and low-power modes supported |
|
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