Magnetometer sensor unit

External enclodure.

External enclosure.

The sensor unit is contained inside a waterproof enclosure approximately 1.1m high which is partially buried to reduce temperature variations and to provide a stable foundation. The sensor itself is placed at the bottom of the enclosure, approximately 0.85m below ground. The microcontroller, radio module and battery are positioned in the top part of the enclosure, above ground level. Insulating material (eg rockwool) is used to fill the space in-between.

The Calunium microcontroller board is based on the popular Arduino platform but uses the more powerful Atmel ATmega1284P microcontroller.

Calunium microcontroller board

Calunium microcontroller board.