....One of the projects we did many years ago ... Nice! On 11/25/14, Dwayne Reid wrote: > One of the projects we did many years ago was an automatic block > heater cord unplugger. The female end of the extension cord was > plugged in as normal. When the engine was started, a screw mechanism > retracted the blades of the male plug and caused the female end of > the extension cord to simply drop away. Really cool and worked quite > well - but I never heard anything about it after we had built the > proof-of-concept prototype. > > As I recall, the screw mechanism was driven by the motor assembly > from a really cheap Chinese-made hand drill. The engine running > detect was done by wrapping a wire around one of the spark plug > wires. Pretty simple stuff, really. But the customer was ecstatic > when he got it. > > dwayne > > > At 01:51 AM 11/22/2014, Justin Richards wrote: >>Thanks rich, >> >>I can imagine from your explaination that there's many stories of people >>driving of without unplugging first. >> >>And wrt the plugs I take it from the description it is what I know as a >>welch or core plug that are used to plug the holes that the moulding sand >>is poured out of. >> >>Cheers Justin >> >> > There is another type that is inserted in to the engine block in >> > place of what we Americans call a freeze plug. I believe you folks cal= l >> > it a soft plug. Again you plug it in at night and it will keep the >> > coolant at about freezing in 30 or 40 degree f below zero temperatures= .. >> > >>-- >>http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >>View/change your membership options at >>http://mailman.mit.edu/mailman/listinfo/piclist > > > -- > Dwayne Reid > Trinity Electronics Systems Ltd Edmonton, AB, CANADA > (780) 489-3199 voice (780) 487-6397 fax > www.trinity-electronics.com > Custom Electronics Design and Manufacturing > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .