Multiplexing for my chess robot
November 17, 2009
Base over Apex showed to me that the "ghost piece" i was talking about could be fixed this way below.
Oh yeah i am doing this because my shift registers... well something happened...no im doing this.
This is a common problem. The answer is a diode on every switch. You still need to scan the rows and columns individually.
Here's how to kill the ghost:
Make your board with only 16 wires instead of 65.
Ok my question is how does a diode on every switch change the "ghost piece" problem?
and on the multiplexing where does the gnd go?
i am using arduino so it has a built in pull down resistor but idk how this darn multiplexing works.