controling a contactor with a secure digital timer ?

testing · science forum beginner Joined: 05 Sep 2005 Posts: 7

I am looking for an inexpensive way to have a user enter a security
code and then enter a timer countdown value that will then activate a
relay or contactor. The access panel could not be tampered with or
timer reset unless you knew the security code. I was thinking a keyed
switch would be the easiest way but would not offer any duration,
simple on or off.
Any ideas on harware - I was thinking os some digital lcd hooked to a
keypad of some sorts. But this is outside my range of expertise.

Thanks in advance

Tim Wescott · science forum Guru Wannabe Joined: 03 May 2005 Posts: 292

RG wrote:

Google