Yes, but options for the Nikon D40 are limited compared with newer bodies. Based on the community replies, there do not appear to be many common ready-made intervalometers specifically for the D40, so people often look at DIY or less-common third-party solutions.

Reported options include IR-based intervalometers such as bigmike, Pclix, and gentLED, as well as some battery grips with built-in timers. A DIY camera-control solution was also suggested.

The main limitation to know is that the D40’s IR receiver may go to sleep after about 15 minutes, which can limit how long your interval can be if you rely on an infrared trigger. Some timer grips may also be limited to a fixed number of shots per sequence.

So, for a D40, the most realistic paths are:

• an IR intervalometer compatible with Nikon IR release control
• a battery grip with timer functions
• a DIY/custom trigger solution
• laptop tethering if portability is less important

If your timelapse needs short-to-moderate intervals, an IR-based accessory is the simplest place to start.