Electronic components are very sensitive. Anything beyond the tolerable range within a fraction of a second is enough to destroy most of them. I learned this lesson in the hard way. A tiny piece of exposed metal of a hanging wire touched the high voltage side of the voltage regulator and destroyed the OLED 20x2 LCD Display (I bought this from eBay for $20) and the SHT11 Humidity Sensor (I got this free but worth more than $40). I can live without the display since there are alternatives but loosing the humidity sensor is a real blow. Buying a new one at this moment is very unlikely. It seems I have to postpone (abandon ?) my weather station. I was about to finish it by adding the barometer module using an atmospheric pressure sensor.
But hey... I got a new project... this time, I have to be extra cautious because it involves 230v. A small mistake can be deadly. Will post the details later...
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