This project uses a micro SD card to store a text file and print it out to a 16x2 liquid crystal display.
Project tutorial by millerman4487
Use a Bluetooth module to replace a traditional wired connection for transmitting serial data.
Use a joystick to control a classic drawing toy through two DC motors.
Play the Chrome Dinosaur Game in real life using physical movements!
Project tutorial by Ryan Chan
Try replacing the speaker with a traditional form of input, like a button, and see if that works. If not, it could be a problem with the led or some other piece of hardware.
The project in the link below uses a raspberry pi, camera, and AI to read and recognize digits: https://www.hackster.io/dhq/ai-digit-recognition-with-picamera-2c017f
This is just a color sensor, so I imagine it would be difficult to distinguish currencies apart using it. A project like that would probably end up using a more powerful board (like a raspberry pi) and a camera, which is basically an entire array of color sensors.
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