| ??? 02/26/05 17:18 Read: times |
#88548 - Dont do this. Responding to: ???'s previous message |
The digital position encoder is device, which is attached on the motor and it generate impulses when the motor is rotating. The encoder has a two output channel with phase shift 90°. I have these output from encoder connected to TH0(P3.4) and TH1(P3.5) pins of my 8052 derivate microcontroller. Please dont connect the encoder signals directly to microcontroller. Search the forum for shaft encoders or quadrature encoders it has been discussed several times and there is a few days old thread too. The boundry line oscillations caused when the motor is stopped is a real danger. The boundry line oscillations issue has been raised several times by Mr. Erik Malund. And there are only two solutions that will work absolutely fine. 1. Use an Agilent quadrature decoder IC such as HCTL2022 or HCTL2032. 2. Use a CPLD you can find the VHDL code by Jez in code library. Regards, Prahlad Purohit |
| Topic | Author | Date |
| Digital position encoder | 01/01/70 00:00 | |
| Dont do this. | 01/01/70 00:00 | |
| Signals are not connected directly | 01/01/70 00:00 | |
| Is assembly ok? | 01/01/70 00:00 | |
| For Mehdi | 01/01/70 00:00 | |
| its easy in software | 01/01/70 00:00 | |
| but | 01/01/70 00:00 | |
| same resolution | 01/01/70 00:00 | |
| But...what if ? | 01/01/70 00:00 | |
| So what is the solution? | 01/01/70 00:00 | |
| absolutely no problem | 01/01/70 00:00 | |
| Thank you | 01/01/70 00:00 | |
| PLEASE not again | 01/01/70 00:00 | |
| Sorry | 01/01/70 00:00 | |
| list.hw.cz | 01/01/70 00:00 | |
| thank you | 01/01/70 00:00 | |
| Re: PLEASE not again | 01/01/70 00:00 | |
| Re frequency | 01/01/70 00:00 | |
| So what frequency do we sample at? | 01/01/70 00:00 | |
| I try to explain Peter's idea again | 01/01/70 00:00 | |
| We know it ! | 01/01/70 00:00 | |
| Nothing ??? | 01/01/70 00:00 | |
| it takes time | 01/01/70 00:00 | |
| Code doesn't function | 01/01/70 00:00 | |
| reverse direction ! | 01/01/70 00:00 | |
| This is not a problem | 01/01/70 00:00 | |
| incorrect operation? | 01/01/70 00:00 | |
| right connection ? | 01/01/70 00:00 | |
| I dunno | 01/01/70 00:00 | |
| Now... | 01/01/70 00:00 | |
| check the sample condition ! | 01/01/70 00:00 | |
| clarify | 01/01/70 00:00 | |
| @Erik | 01/01/70 00:00 | |
| @Peter | 01/01/70 00:00 | |
| Grey code | 01/01/70 00:00 | |
| Grey code more | 01/01/70 00:00 | |
| Grey INCREMENTAL ? | 01/01/70 00:00 | |
| I guess 98 | 01/01/70 00:00 | |
| Gray code | 01/01/70 00:00 | |
| Not a gray code | 01/01/70 00:00 | |
| Grey | 01/01/70 00:00 | |
| Yes of course its Grey code | 01/01/70 00:00 | |
| Absolute Vs Incremental | 01/01/70 00:00 | |
| So now... | 01/01/70 00:00 | |
| Yes it can but only... | 01/01/70 00:00 | |
| Peter is right! | 01/01/70 00:00 | |
| Lover not a fighter :-) | 01/01/70 00:00 | |
| Lover of software | 01/01/70 00:00 | |
| steps lost or not | 01/01/70 00:00 | |
| Determining direction | 01/01/70 00:00 | |
Its not Grey, its Gray ! | 01/01/70 00:00 |