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Matrix and Keypad Button Wiring
Matrix wiring of the inputs allows us to use many more pushbuttons than the individual inputs
available.
We use a system of Columns and Rows. Each column and each row is assigned to an input on
the Hydra.
A pushbutton will have 2 terminals. One is connected to a column and the other to a row.
Each intersection of a column and row is a place for a pushbutton. See the example on page 32.
Since the Hydra has 10 input terminals, we can have up to a 5x5 matrix with up to 25 push
buttons.
3x4 Matrix wiring Input terminals marked on the front panel
Button number
Input Connection 1
1
0
2
1
3
2
4
0
5
1
6
2
7
0
8
1
9
2
10
0
11
1
12
2
4x4 Matrix wiring Input terminals marked on the front panel
Button number
Input Connection 1
1
0
2
1
3
2
4
3
5
0
6
1
7
2
8
3
9
0
10
1
11
2
12
3
13
0
14
1
15
2
16
3
Input Connection 2
Plays file named
3
001
3
002
3
003
4
004
4
005
4
006
5
007
5
008
5
009
6
010
6
011
6
012
Input Connection 2
Plays file named
4
001
4
002
4
003
4
004
5
005
5
006
5
007
5
008
6
009
6
010
6
011
6
012
7
013
7
014
7
015
7
016
MedeaWiz® Hydra™
(* clear key on Mode 33, 34)
( zero on Mode 33, 34)
(# enter key Mode 33, 34)
30 |
P a g e
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