| ??? 05/26/07 16:19 Read: times |
#139876 - Stretching pulses Responding to: ???'s previous message |
Russell said:
Just for discussion, suppose the polling loop takes 120 microseconds to get around to looking at all 12 inputs. Now even though the pulses don't come any faster than 15 Hz, if any given pulse is narrower than that 120 microsecond loop time, the polling loop might miss it.
-- Russ In that case, it would be very simple (with an RC network, probably), stretching the narrow pulses to a more comfortable width. DC |
| Topic | Author | Date |
| 12 parallel pulses counting | 01/01/70 00:00 | |
| How fast are these pulses? | 01/01/70 00:00 | |
| pulses speed | 01/01/70 00:00 | |
| More info | 01/01/70 00:00 | |
| Pulse rate | 01/01/70 00:00 | |
| Isn't it slightly more complicated? | 01/01/70 00:00 | |
| Stretching pulses | 01/01/70 00:00 | |
| Another Quick Way | 01/01/70 00:00 | |
| Sampling timer with a buffer | 01/01/70 00:00 | |
| Showing Vertical Couners | 01/01/70 00:00 | |
| Yes other interrupt are also there | 01/01/70 00:00 | |
| Avoid using interrupts where possible | 01/01/70 00:00 | |
| Run signals frequency... | 01/01/70 00:00 | |
| PLC can be dirt cheap | 01/01/70 00:00 | |
| PLCs | 01/01/70 00:00 | |
an xcellent idea | 01/01/70 00:00 | |
| Sample with 2 74LS165 parallel loadShiftRegisiters | 01/01/70 00:00 | |
| would not the output pins drop... | 01/01/70 00:00 | |
| No Extra Hardware Needed | 01/01/70 00:00 | |
| No Extra Hardware Needed - I do not agree | 01/01/70 00:00 |