Combine a Yocto-Altimeter with a YoctoHub-GSM-3G-EU to get an autonomous appliance with built-in network connectivity:
The Yocto-Altimeter device is a USB altimeter : it will give you an altitude estimate based on atmospheric pressure. The Yocto-Altimeter is precise enough to detect 25cm altitude changes. It will also give you the current pressure and temperature. Data can be recorded on the internal flash memory, in order to build a data history that can be retrieved later on over USB.
This circuit has been designed so that the sensor itself can be moved further away from the USB connector by a few meters: simply split the board into two parts and solder a 4-wire cable on the designated pads.
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The YoctoHub-GSM-3G-EU is a wireless-enabled module that can host three Yoctopuce modules to access them remotely through a 3G GSM cellular network (UMTS and HSPA). It can be powered either by a USB Micro-B cable and a regular phone charger, or a 5V battery pack.
The radio module supports the two GSM frequency bands 900 MHz and 1800 MHz used in Europa, Middle-East, Africa, Asia and Pacific. For a detailed list of frequency bands supported in each country, please refer to the Wikipedia page GSM_frequency_bands.
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