| ??? 03/14/06 17:58 Read: times |
#112151 - None of them Responding to: ???'s previous message |
Nandhu Kumar said:
I am on a tachometer project. Pls suggest me the best one
1) Count number of pulses in one second and multiply into 60 2) Get the time between two pulses and calculate the frequency None of them. At first you must decide an ergonomical update rate, e.g. every 300ms. If the update rate was to fast, you see only flickering but no stable reading. Then wait for the first pulse and start the timer and count the pulses. After about 300ms wait for the next pulse and stop the timer. Then you have the time for nn pulses and can calculate the RPM. This trick give you always high accuracy on low speed and also on high speed. And you get always an ergonomical update rate of no faster than 300ms. If you get no pulses during 300ms, then display 0 RPM. Peter |
| Topic | Author | Date |
| tachometer "which one is best" | 01/01/70 00:00 | |
| > Which accuracy do you expect? | 01/01/70 00:00 | |
| accuracy | 01/01/70 00:00 | |
| Both are acceptable | 01/01/70 00:00 | |
| Actually, the choice is only related to | 01/01/70 00:00 | |
| mobike plug | 01/01/70 00:00 | |
| shooting for the moon | 01/01/70 00:00 | |
| resolution | 01/01/70 00:00 | |
| Cleaning input signal | 01/01/70 00:00 | |
| How do you propose to get the signal? | 01/01/70 00:00 | |
| inductive pickup | 01/01/70 00:00 | |
| cleaning input signal from the spark plu | 01/01/70 00:00 | |
yes, mistype | 01/01/70 00:00 | |
| None of them | 01/01/70 00:00 |