[bee_rider]

Depends on the park, I guess. Any electronic system will definitely require electricity, at least! Involving a QR code and a website seems to add a lot of complexity (what if the camper's phone is out of juice, what if they just have a flip phone, what if they just didn't bring their phone with them to the garbage? Plus we'll need a network connection).

An electronic keypad might work, still need electricity but it is a lot simpler. IMO you'd want something that doesn't require even simple written instructions -- I mean rarely, but still occasionally you might get a visitor with limited English literacy (people from other countries, etc). But a keypad with a number over printed above it should be kind of obvious... or a combination lock with the same. Although you'll always get somebody who doesn't make the link.

[orthoxerox]

> An electronic keypad might work, still need electricity but it is a lot simpler.

There are mechanical keypads where you have to press three buttons simultaneously.

> Although you'll always get somebody who doesn't make the link.

I once came home to see the apartment block superintendent overseeing the installation of a new mechanical keypad. The door was covered with sticky notes saying "130" over and over again, but I still almost asked him what the new code was going to be.

[bee_rider]

>> An electronic keypad might work, still need electricity but it is a lot simpler. [...] or a combination lock [...]

> There are mechanical keypads where you have to press three buttons simultaneously.

The combination lock has the benefit of being a little more familiar.

>> Although you'll always get somebody who doesn't make the link.

> I once came home to see the apartment block superintendent overseeing the installation of a new mechanical keypad. The door was covered with sticky notes saying "130" over and over again, but I still almost asked him what the new code was going to be.

It makes sense that you'd be confused -- what's the point of a keypad with the combination on the door? Unless bears are breaking into the apartment!

This does seem to indicate a problem with the keypad/combination lock idea though. Since most people are familiar with them as a form of human-blocking access control, they might not assume the number above is the password (somebody might think it is an ID number for the garbage can, for example).