I have had to replace the fan (and the original A/V cabinet, as the current TV is 50") but almost 14 years later the simple PICAXE project on a piece of perfboard is still cooling things (primarily the cable TV DVR) in an A/V cabinet. Does anyone track the longevity of PICAXE projects?
papaof2--your water detection circuit from along about 2007 (I think for a daughter's house) was one of my earliest picaxe inspirations. Now that my 11-year-lasting 3-AA blinker has run down I no longer have any really aged (in PICAXE years) active projects--a bunch of temperature sensors from 6-8 years ago.
My rivercam pan and tilt 08M from 2009 is still working, though I have disabled public access to the pan and tilt part (because people were leaving the camera pointing to the mildewed corner of the window the camera is mounted in).
I have to adjust the pan and tilt after a power outage. That picaxe is dead-bug wired to fit into a router case. If it were accessible I might re-program it to remember where it had been pointed, but if it ain't (too badly) broke, don't fix it.
Back in 2011 I build an accelerometer for my home built aircraft. I don't have the plane anymore, but I still have the accelerometer and it still works. It uses an 18M and a two line LCD to implement a digital and analog reading. Calibration is done use good old natural gravity. A single push button controls it. I must confess I've forgotten how to access the various functions with the single button.
It does help to write up the "how to" somewhere with your projects ;-) After more than 850 months on this planet, I've learned that having good comments in software source code and findable notes about "how things work" are both very useful ;-)
I've got 2 PICAXE talking to each other via 433 MHZ radio for about 9 years now....a 20x2 in the pump-house, monitoring temperatures and well pump status, and a 08M in the house, connected to an LCD and LEDs that receives the message and displays temperatures, pump status, etc...if I recall, I used 254 of the 255 available bytes on that receiver program!
I have a 20x2, 28x1, 18m2 and 2x 14m2's on stripboard circuits running a central heating thermostat and 3 bar rainwater pump controller 24/7 for 7 years - no faults at all. I also have raspberry Pis running 24/7 for a few years, but I had to reinstall the OS on all of them once a year to keep them running. I've been using PICAXEs for 12 years, and all chip failures are my fault (overvoltage / short circuits / ESD)
My first 08M project has been operating the crossing lights and gates on my model train layout since 2001, and my second surviving 08M project that detects when the track switches have been routed towards the removable swing bridge and the bridge has been opened has been preventing me running trains off the open edge where the bridge should be since 2005. They've since been joined by an assortment of 28X / 14M2 / 18M2+ boards doing a variety of other things and a series of model train signalling modules that I'm actively developing to this day.