emmanuel63
Well-known member
Hello,
For a musical project, I need to find a way to identify simple wooden coins lying on a board.
Say we have :
- a board divided in a 64 cells, exactly like a chess board.
- on a few cells, I put some wooden coins. They all have the same shape (say a small cylinder) but have different values printed on them : 10, 50, 100, 1000.
I want to find a way to identify which cells are covered with a coin, and what is the coin's value.
I was thinking of :
- RFID/NFC tags for every coin. But how to read the entire board at once ?
- QR code printed on the bottom of every coins. But same question : how to read the entire board at once ?
- photo resistors. Every cell of the board have a builtin photo resistor. When a coin hide the photo resistor, resistance changes. It is easy to know which cell has a coin, but I don't know if it is possible to discriminate the value of the coin. Maybe painting the bottom of the coins with different shades could induce different reflexion ratios, and thus a different signal ? Seems difficult to calibrate...
Thank you to share your ideas !
Emmanuel
For a musical project, I need to find a way to identify simple wooden coins lying on a board.
Say we have :
- a board divided in a 64 cells, exactly like a chess board.
- on a few cells, I put some wooden coins. They all have the same shape (say a small cylinder) but have different values printed on them : 10, 50, 100, 1000.
I want to find a way to identify which cells are covered with a coin, and what is the coin's value.
I was thinking of :
- RFID/NFC tags for every coin. But how to read the entire board at once ?
- QR code printed on the bottom of every coins. But same question : how to read the entire board at once ?
- photo resistors. Every cell of the board have a builtin photo resistor. When a coin hide the photo resistor, resistance changes. It is easy to know which cell has a coin, but I don't know if it is possible to discriminate the value of the coin. Maybe painting the bottom of the coins with different shades could induce different reflexion ratios, and thus a different signal ? Seems difficult to calibrate...
Thank you to share your ideas !
Emmanuel