Matrix Orbital Corp

I'm interested in using TTL to interface to the keypad. Are there more specs available on how it works than what's in the manual? I understand the 'row pin shorts to column pin' concept pretty well, I'm trying to figure out how a device that generated TTL outputs could drive the keypad inputs.
(Without relays)

You could use the same principle I used for the IR-to-keypad-circuit I made earlier. It used 4066s as switches and they can be controlled by TTL, should be...

Stig

Looks promising.

Like Stig says, that's the only way. The key scan works by making the previously grounded pins high one at a time to find out which one is making the previously high pin to be now low. So, you *must* short two pins together. An analog switch attached to the TTL input which connects a column and a row is (I think) the best solution. Though, I suppose a simple transister could do the job... I think... Might require a pullup resister on the row... not sure.

Thanks for the input, Aniso, it gives me a good direction.

Since a 4066 costs less than a buck, I'll take a stab at it that way Plus I can think of a couple other ingenious uses for it...