| ??? 03/02/07 18:52 Read: times |
#134132 - Consider the following: Responding to: ???'s previous message |
If "IR transmitter receiver" = slotted optical interrupter, then the positional accuracy of the switch, which is around 0.2-0.3mm is a fairly large fractional percentage of the size of the 2mm "plate" you are sending through it.
Additionally, the size of the object is pretty small compared to the typical size of the photo transmitter in these devices. You might not be able to sense the "plate" at all... And finally, unless you are interested in measuring pulses that are faster than 1 ms (which would mean your plate would be moving at speeds around 80 inches/second), you could tune your system by measuring a known signal of say a pulse width of 25 usec, then use your interrupt to count 25 usec increments, thereby reducing your inaccuracy. My guess is you should focus your attention more on the sensor, and less on the crystal for the micro you'll be using... Just a thought... Dave |
| Topic | Author | Date |
| Crystal Oscillator Accuracy | 01/01/70 00:00 | |
| Its probably highly non-linear | 01/01/70 00:00 | |
| commercial crystal oscillators | 01/01/70 00:00 | |
| You should tell us the speed of your moving object | 01/01/70 00:00 | |
| speed of shock absorber | 01/01/70 00:00 | |
| Induced voltage | 01/01/70 00:00 | |
| calibration problem | 01/01/70 00:00 | |
| Calibration | 01/01/70 00:00 | |
| just a thought | 01/01/70 00:00 | |
| Temperature extremes of your watch | 01/01/70 00:00 | |
| good one Lynn :) | 01/01/70 00:00 | |
| Consider the following: | 01/01/70 00:00 | |
| correct, but incorrect | 01/01/70 00:00 | |
| reconsider this... | 01/01/70 00:00 | |
| I have seen far worse than this | 01/01/70 00:00 | |
| my thought | 01/01/70 00:00 | |
| the plate vibrates which it WILL do | 01/01/70 00:00 | |
| that will be big problem then | 01/01/70 00:00 | |
I think Steve has it... | 01/01/70 00:00 |