| ??? 09/21/07 15:26 Modified: 09/21/07 15:28 Read: times |
#144881 - unless ... Responding to: ???'s previous message |
.. your port pin is conficured as push-pull (does the upsd3354D have configurable ports ?) the only possibiliy will be that you are using a contact that requires a ninimum current to always close (such as certain contactors). You can fool a '51 to not see a '1' but not to not see a '0'.
I take it that what you describe is repeatable. Erik [edit]just to make sure, you do mean somewhere close to 0V by ')' and somewhere close to Vcc by '1'[end edit] |
| Topic | Author | Date |
| upsd3354D GPIO input question | 01/01/70 00:00 | |
| Pardon? | 01/01/70 00:00 | |
| Clarifiaction | 01/01/70 00:00 | |
| unless ... | 01/01/70 00:00 | |
| this is easy to check... | 01/01/70 00:00 | |
| Sorry | 01/01/70 00:00 | |
| Problem fixed. | 01/01/70 00:00 | |
| this sounds like a pulldown problem or similar | 01/01/70 00:00 | |
| Thanks, but... | 01/01/70 00:00 | |
| this is exactly what I am talking about | 01/01/70 00:00 | |
| Thanks | 01/01/70 00:00 | |
Welcome | 01/01/70 00:00 |