The probes are composed of custom electronics encased in a strong case made of polyester in our workshop.

2012 probes for Iceland are tougher and slightly larger than recent probes.

The 2011 design of probe case

The GW12 Probe is a new design based on the Energy Micro ARM-based EFM32G230F128 MCU. It has the following features:

32bit ARM Cortex-M3 Processor (16k RAM, 128k flash)
2GB microSD Card for storing readings
3 colour LED
User Switch
Debug Serial Interface
Sensors
HMC5883 Compass Sensor
MMA8451Q Accelerometer Sensor
INA333 Platinum temperature sensing bridge tuned to -5 to +5 degrees C
500psi Pressure sensor
Strain Bridge
Conductivity Sensor

Radio
Radiometrix RPM1 151.3 100mW Radio Module

Details of the previous versions are available.

For more details on the designs see our papers section.