The sensor is just a solenoid about 2m long with, I'd guess, tens of thousands of turns. The electronics is a very sensitive DC coupled amplifier with extremely low low frequency (especially 1/f) noise followed by an ADC. The system is looking at low frequency changes in the local Earth's magnetic field due to changes in current flowing in the ionosphere which is influenced by the solar wind.

A complication for our situation is that everything is running off solar power and there is no network connection available (cellular, POTS or fiber). The main issue we have with the logger is that it doesn't reliably recover from low power situations. It doesn't help that the system is powered over a 60m cable which generates about 1V drop between the 14V boosted supply and the logger. Things were much worse before I put a voltage boost system in at the supply end.

Optimising for fewest key strokes only makes sense transmitting to Pluto or beyond

In reply to Re^6: Quick script to check data logger data by GrandFather
in thread Quick script to check data logger data by GrandFather

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