Here’s a startrails image that I managed to take with the Raspberry Pi and it’s camera module. I used the Python-PiCamera module to take a picture exposed for 6 seconds(which I think is the maximum right now), and repeat it every 2 minutes. Here’s the final somewhat-processed image:
I took about 50-60 pictures for about an hour and a half, after which the clouds started creeping in. The code is rather simple, and is available in PiCamera documentation. I hope to try this again and capture more number of pictures, and with reduced or no sleep time, just to get smoother trails.