Made by CMU, this can be used to collect visual information from the surrounding, allowing the Arduino to detect changes in light, color, or motion.
2. VoiceBox Shield
With a sound synthesizer, we can generate voice, thus allowing the Arduino to speak. This can be very useful to communicate messages en masse.
3. TFT Shield
We can display images via this shield, and with some modifications we can display text also. This allows for a wide range of outputs.