Happy to share about my first Arduino project... !! I built an automatic volume controller using Arduino Uno with 2 sensors, audio sensor and IR transmitter.
It controls TV volume, it will bump up the volume when TV is hard to hear, and lowers the volume, when it gets too loud..!!
Project video in on YouTube at: Auto Volume Controller Using Arduino Uno - YouTube
Most challenging part was the logic to reduce the volume.. Decreasing the volume is an easy decision.. but when to increase was tough to code.. But was able to crack it, please let me know if you are working on something similar, I might have some useful tips !!