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<blockquote data-quote="Rob Spence" data-source="post: 2689" data-attributes="member: 80">I have a really long driveway on the &quot;blind&quot; end of the house from where I often hang out.There are times when I would like to know if someone has come up the drive. For example, the F&amp;^(Ex guy has on many occasions left a sticky note on the door saying no one was home when I was waiting at home for an overnight delivery but I was in the shop or office and didn&#039;t know he was there. Or, when you are waiting for company it would help to head toward the door to welcome them.So, I hooked up a standard motion sensor that is used for turning on flood lights to a relay to a doorbell. It detects cars or people on the drive just fine (after I taped over the photocell) but I am getting lots of false alarms in the morning due to sun and shadows with the wind moving the branches. Sigh...I thought of using a photo detector with a reflector on the other side of the drive but I worry about the reflector getting buried in snow if we have it like last year <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":-)" title="Smile&nbsp; &nbsp; :-)"&nbsp; data-smilie="1"data-shortname=":-)" />With a gravel drive, any mats or things on the ground are not going to work well I think?Any ideas?</blockquote>

[QUOTE="Rob Spence, post: 2689, member: 80"] I have a really long driveway on the "blind" end of the house from where I often hang out. There are times when I would like to know if someone has come up the drive. For example, the F&^(Ex guy has on many occasions left a sticky note on the door saying no one was home when I was waiting at home for an overnight delivery but I was in the shop or office and didn't know he was there. Or, when you are waiting for company it would help to head toward the door to welcome them. So, I hooked up a standard motion sensor that is used for turning on flood lights to a relay to a doorbell. It detects cars or people on the drive just fine (after I taped over the photocell) but I am getting lots of false alarms in the morning due to sun and shadows with the wind moving the branches. Sigh... I thought of using a photo detector with a reflector on the other side of the drive but I worry about the reflector getting buried in snow if we have it like last year :-) With a gravel drive, any mats or things on the ground are not going to work well I think? Any ideas? [/QUOTE]

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