| ??? 12/20/04 15:08 Read: times |
#83524 - potential divider / where wires go Responding to: ???'s previous message |
Hi Andy ,
you mentioned a nice idea , but as russell saied i am using 4.7K pull downs along the internal pull ups so i guess this is not the trouble ,this setup should give me 0.23 V for low input,and exactly 5V for high. but there is something that makes me wrong , why whenever i write 0's to the port and disable the pullups ,the inputs are working OK ! ,this tells me the problem should be exactly from a potential-divider or maybe an internal capacitor on inputs is charching and don't discharge till i connect my multimeter!? @:( Hi Erik, after uploading the pictures to 8052.com ,i have previewed the pictures and there was no problem , and Prahlad J. Purohit (and maybe others) don't have any problems viewing it (?). so i am guessing that maybe like the IE ,your browser shows a preview of the larger pictures(Schmeatic's resolution is more than 2024x1280!) in a smaller window ? Best Regards : Farshid J.H. |
| Topic | Author | Date |
| invalid voltage on a pulled up/down Port | 01/01/70 00:00 | |
| replace s with c | 01/01/70 00:00 | |
| Thats not the solution. | 01/01/70 00:00 | |
| please follow the main problem | 01/01/70 00:00 | |
| and some news | 01/01/70 00:00 | |
| s51 is good | 01/01/70 00:00 | |
| Pullup/down | 01/01/70 00:00 | |
| Sorry for Echo. | 01/01/70 00:00 | |
| pull up/downs | 01/01/70 00:00 | |
| pullup+pulldown = potential-divider? | 01/01/70 00:00 | |
| Potential, potential divider? | 01/01/70 00:00 | |
| potential divider / where wires go | 01/01/70 00:00 | |
| blow it | 01/01/70 00:00 | |
| don't blowed it (atleast not untill now) | 01/01/70 00:00 | |
| where does the wires go | 01/01/70 00:00 | |
| To Erik and others | 01/01/70 00:00 | |
| This will not work with 'C51s | 01/01/70 00:00 | |
| Exactly | 01/01/70 00:00 | |
| just got the point :) | 01/01/70 00:00 | |
| And finally the problem solved! | 01/01/70 00:00 | |
| I meant ++hundreds of microampere++ | 01/01/70 00:00 | |
| Wrong question ! | 01/01/70 00:00 | |
| Negative Logic? | 01/01/70 00:00 | |
Yes, negative logic! | 01/01/70 00:00 |