Hi, all, I'm after some advice,please. I recently built a version of Rob Brown's DIY SQM. I mounted the main electronics box in my observatory, with the main sensors in a modified weather station cover outside, on the end of a 1m cable. The sensors I used were a BME280 pressure and temp sensor, an MLX90614 to measure sky temperature and a TSL2591 to measure lux. The cover is a TFA Dostman weather station cover which stops direct rain and sun, but allows airflow to the sensors. The TSL2991 is protected under a plastic lens, and the IR thermometer can is sealed and itself waterproof, but the rest of the board is not. The sensors are connected by STEMM QT connectors.
After 3 weeks, I have extensive water damage to the sensor boards, with corroded components. The problem is humidity, and the boards are wet at least some of the time. I had expected some problems from this, as I live in the UK, but the damage has been greater/faster than I anticipated. My question is what I can do to fix this in a rebuild? I can replace the QT connectors with soldered connections, but what can I do to protect the boards? Potting seems an obvious solution, but what would be suitable? Also, how can I protect the BME280 and the TSL2591, given that these need the active sensors to be exposed? I realise the question is pretty basic, but my previous experience of electronics was in aviation, where the cost is several orders of magniture greater, but buys better spec'ed items.
Any advice gratefully received.
Tim