| ??? 03/04/08 17:25 Read: times |
#151887 - key matrix Responding to: ???'s previous message |
Indeed.
The funny thing is I made this very error when I was young and stupid (albeit in a more complicated configuration, so it blew only upon a multiple keys press, which was quite impossible for anybody but an octopus - yet it still happened from time to time... :-) . It had to be fixed using diodes in series with the column drivers (row inputs were sensed via comparators so the voltage shift was not a problem)). There is no need to blame the user for a "mistaken multiple press" - this is the fault of the designer not to take every possible measure to prevent hardware - and also software - failure as a consequence of any *possible* user input. Good quiz, thanks Erik. JW |
| Topic | Author | Date |
| d n ot answer till Monday, but think about it | 01/01/70 00:00 | |
| Ok, let's hear what you have figured | 01/01/70 00:00 | |
| wired-or outputs, of course... | 01/01/70 00:00 | |
| Shared Reset Pin | 01/01/70 00:00 | |
| Shared Reset Pin #2 | 01/01/70 00:00 | |
| Matrix Keypad Pins. | 01/01/70 00:00 | |
| BitBanged I2C | 01/01/70 00:00 | |
| Yes, Michael that was the one | 01/01/70 00:00 | |
key matrix | 01/01/70 00:00 | |
| The infamious reset | 01/01/70 00:00 |