Woo hoo..just found this forum and it might just be what i'm looking for
Check **broken link removed** It's a frost alarm to close/open a relay when things get cold, but what i want to do is reverse this and have it operate when things get hot, typically above 30-35 degrees. Its hopefully going to be used to start a fan running when the air inside my pc gets above that temperature and stop itself when the air reaches a low enough temperature. But only having a fairly rudimentary knowledge of electronics, not beginner, but not advanced, i dont know the correct thermistor to replace the 15k one. If indeed this would be neccesary, if anyone can help then i'd be most grateful.
Check **broken link removed** It's a frost alarm to close/open a relay when things get cold, but what i want to do is reverse this and have it operate when things get hot, typically above 30-35 degrees. Its hopefully going to be used to start a fan running when the air inside my pc gets above that temperature and stop itself when the air reaches a low enough temperature. But only having a fairly rudimentary knowledge of electronics, not beginner, but not advanced, i dont know the correct thermistor to replace the 15k one. If indeed this would be neccesary, if anyone can help then i'd be most grateful.