What cool projects do you suggest I build with a Raspberry Pi 2W

Almost same question, but quite tangential: I'd like to have a plant watering system with least complexity involved. I would assume a fish tank pump plugged into any PC. The plugging part however is not quite-well thought out, neither the output to multiple pots. Could you suggest some ideas? Arduinos, valves, etc? The watering is not automatic and should happen with a push of a PC keyboard key.

I want to put one on a model train, with camera; possibly with pan & tilt on the camera. have it stream video, offer camera controls, maybe put audio output on it.

I wanna do this in N scale.

I doubt i'll ever get the full vision of the idea realized but i've got a few seconds of footage from train POV as it runs around the table from a taped together prototype test and that may be enough to keep me interested in the idea.

Automate parts of your home life with Node-RED:

https://hackaday.com/2020/01/15/automate-your-life-with-node...

Alternatively, if you are interested in making or playing back music, one idea is to turn the Raspberry Pi into a MIDI synthesizer:

MiniDexed: 8 DX7 Tone Generators

- https://github.com/probonopd/MiniDexed

- https://www.youtube.com/watch?v=Z3t94ceMHJo

MT32-Pi: Roland MT-32 emulator

- https://github.com/dwhinham/mt32-pi

- https://www.youtube.com/watch?v=vaSD_wbzJRw

Optionally, buy a PCM5102/PCM5122 or ES9018K2M I2S DAC to improve the output sound quality:

https://raspberrypi.stackexchange.com/questions/76188/how-to...

PCM5102 (~$7): https://www.aliexpress.com/wholesale?SearchText=PCM5102+DAC

ES9018K2M (~$12): https://www.aliexpress.com/wholesale?SearchText=es9018k2m+i2...

Buy a bunch of cheap sensors from Amazon and learn to interact with them. Learn what I2C is, and learn how to chain a bunch of devices together. Get a few relays or servos and you can learn how to start interacting with the physical world through machines. Find a recurring task in your life and automate it

You could try to build a bluetooth / wifi audio receiver (!) with push buttons for Play, Pause, Forward, Rewind, etc.

I always wanted to try this for having bluetooth to aux in my car, but I never finished it.

Here is a project, that tried to accomplish this: https://github.com/BaReinhard/Super-Simple-Raspberry-Pi-Audi...

And my personal notes and scripts: https://github.com/sandreas/raspberry-bluetooth-receiver

Get a few RGB bulbs and install Home Assistant, instant disco!

https://www.home-assistant.io/

Attach a battery, a camera, a 1 inch screen and a big button -- make a doorbell.

If you make music, my project lets you send midi over Bluetooth via the PI

https://github.com/Mylab6/PiBluetoothMidSetup