In a previous post I discussed how I make use of an online appointment system to save time and reduce email traffic. Here's another aspect to this, how students can book appointments directly from my office door. Very straightforward to implement - I use Calendly because it works with MS Exchange but if you use a google calendar it works fine with that as well.
This is all very straight forward - it contains three different ways that students can check my available slots and book in.
1) They can manually type in the URL
2) They can use the phone on their camera to read a QR code - if you have never used this before there are many website that will generate these for free for you.
3) Finally they can directly tap their phone against the notice if they have an NFC enabled phone. NFC tags are fairly cheap to buy and you don't need any special equipment to set them up. Any NFC capable phone can be used to write to the sticker - in this case the URL of my diary.
The whole thing took less than ten minutes from start to finish and the longest bit was waiting for the laminator to warm up...