# Recommended Sensor / Type of the sensors to be used

For example, I have a board (A plain board or a board with sensors, this needs to be decided depending on sensors ). On this board, I will place small objects. These small objects are having 2 sides (like a coin). I just want to know how many objects are placed on this board.

What kind of sensors can I fit on the board?
What sensors can I use on these small objects? (might be some sort of magnetic strip attached to these small objects and the sensor on the board can detect these object)

The objects can be placed randomly(not one at a time) on the board. Each object can be of different weight.

• Mount a camera above (or below) the board? – geometrikal Dec 26 '13 at 13:50
• Individual RFID tags? You'd have to check whether they can detect more than one tag at once. – pjc50 Dec 26 '13 at 23:13