| ??? 08/28/09 23:14 Read: times |
#168594 - External resistors for speed or reading slower Responding to: ???'s previous message |
Note that all signals always have some form of bandwidth limitation.
The question here is how fast you must be able to read your switch. You can save money and use weak internal pull-up if you adapt the reading speed. In some cases, it is possible to save cost and board space by removing pull up/down or series resistors. In some other situations, it isn't, because the resistors are needed to reduce the noise by reducing the bandwidth of a signal, or to make the signal low-impedive enough that external noise will not create false readings. |
| Topic | Author | Date |
| dip-switch matrix trouble | 01/01/70 00:00 | |
| Need more information | 01/01/70 00:00 | |
| It's olá ... | 01/01/70 00:00 | |
| ghosting? | 01/01/70 00:00 | |
| Looks like ghosting | 01/01/70 00:00 | |
| Do you have two spare pins? | 01/01/70 00:00 | |
| Please tell us how you've wired your matrix | 01/01/70 00:00 | |
| My working matrix schematic* | 01/01/70 00:00 | |
| It looks OK, but... | 01/01/70 00:00 | |
| maybe, maybe not | 01/01/70 00:00 | |
| thats true | 01/01/70 00:00 | |
| External resistors for speed or reading slower | 01/01/70 00:00 | |
| noise, yes - but | 01/01/70 00:00 | |
| Different use of resistors | 01/01/70 00:00 | |
| I could be mean | 01/01/70 00:00 | |
| Was actually on topic ;) | 01/01/70 00:00 | |
| being off-topic or not... | 01/01/70 00:00 | |
| You need to show us the schematic and more | 01/01/70 00:00 | |
| he did | 01/01/70 00:00 | |
| Not quite enough | 01/01/70 00:00 | |
| not much code to show | 01/01/70 00:00 | |
=) Thanks for the +1 Informative =) | 01/01/70 00:00 |