Discussion in 'The Projects Forum' started by kevin306, Apr 18, 2013.

Apr 18, 2013
7
0

Jun 6, 2011
2,759
2,944
3. ### kevin306 Thread Starter New Member

Apr 18, 2013
7
0
Yes my lecturer was saying that but I didn't fully understand what I am meant to do. what exactly do I do?

4. ### joeyd999 AAC Fanatic!

Jun 6, 2011
2,759
2,944
I'm assuming you're trying to figure which pins relate to which rows and columns with respect to the keyboard, yes?

Well, think about what a key (switch) does in relation to those rows and columns. Then use an ohmmeter to identify which key is represented by which row and which column.

5. ### MrChips Moderator

Oct 2, 2009
12,657
3,461
It is shown on page 6 of the datasheet.
For a 4x4 keypad there are 8 pins, 4 rows x 4 columns.
For a 4x3 keypad there are 7 pins, 3 columns x 4 rows as shown on the datasheet.

6. ### joeyd999 AAC Fanatic!

Jun 6, 2011
2,759
2,944
Ha...I didn't even realize he posted one. You shouldn't have told him...he would have learned more the hard way.

7. ### paulktreg Distinguished Member

Jun 2, 2008
626
125
The information is on the datasheet page 6.

X1 connects to 1,4,7 & *, etc.

Y1 connects to 1,2 & 3, etc.

Still not sure?

8. ### kevin306 Thread Starter New Member

Apr 18, 2013
7
0
Never even saw that to be honest. Thanks for that cheers.

9. ### WBahn Moderator

Mar 31, 2012
18,096
4,920
But do you know whether you have a matrix or a common point keypad? Count the number of pins and compare to the data sheet.

10. ### kevin306 Thread Starter New Member

Apr 18, 2013
7
0
Though I had it wired up correctly but looks like I dont. The way I connected it was the row 1,2 & 3 are X1,X2 & X3 respectively. And the columns are Y1,Y2,Y3 & Y4.

11. ### joeyd999 AAC Fanatic!

Jun 6, 2011
2,759
2,944
Have you tried an ohmmeter yet?