You can buy a remote switch for the Canon 400D, but that costs at least $35 and at the end of the day it is just a switch on the end of a cable. This project adds a nifty timer to the cable in the form of a PIC 12F675 (or PIC 12F629) micro-controller for about the same price - or less if you build it from scavenged parts as I did.
It can be used to take photographs at intervals from 1 to 65535 seconds (approximately 18 hours). It features:
- A single button to control all functions
- Audible feedback via a piezo speaker
- Visual feedback via a bi-color LED
Using one button to control the timer is surprisingly easy and makes it really cheap to build.