gca186-en
Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| gca186-en [2018/12/24 16:28] – [Why hallsensors?] phg | gca186-en [2018/12/24 22:18] (current) – [The prototype board] smitt48 | ||
|---|---|---|---|
| Line 21: | Line 21: | ||
| Now the basic is to fix at least two magnets under the train, one in front, and one under the last waggon.\\ | Now the basic is to fix at least two magnets under the train, one in front, and one under the last waggon.\\ | ||
| More than two is no problem, the limit = 255.\\ | More than two is no problem, the limit = 255.\\ | ||
| - | Next we need four hall sensors to be mounted between the sleepers, so that they will sense the magnets | + | Next we need 4 hall sensors to be mounted between the sleepers, so that any magnet |
| **NOTE: | **NOTE: | ||
| Be sure that the train should fit completely between sensor A and sensor C, and/or between point D and B.\\ | Be sure that the train should fit completely between sensor A and sensor C, and/or between point D and B.\\ | ||
| Line 46: | Line 46: | ||
| The flashing lights are only shut off after the barriers are completely up again.\\ | The flashing lights are only shut off after the barriers are completely up again.\\ | ||
| If you swap A with D and B with C in this text, you have the explanation for the opposite way.\\ | If you swap A with D and B with C in this text, you have the explanation for the opposite way.\\ | ||
| - | For a one way traffic, different firmware will be available,but not necessary, also for double track .\\ | + | For a one way traffic, different firmware will be available, also for double track.\\ |
| This board cannot service more than doubletrack, | This board cannot service more than doubletrack, | ||
| That would need many more sensors , which there is no input for.\\ | That would need many more sensors , which there is no input for.\\ | ||
| Line 53: | Line 53: | ||
| ===== Why hallsensors? | ===== Why hallsensors? | ||
| It is obvious that sensing the length of a train can only be done if sensors count correctly.\\ | It is obvious that sensing the length of a train can only be done if sensors count correctly.\\ | ||
| - | Current detection is also possible, but in this case not very accurate, and also the last waggon should consume any current from the rails\\ | + | Current detection is almost impossible and very inaccurate, and also the last waggon should consume any current from the rails\\ |
| Reed switches are not suitable because one action could generate multiple pulses.\\ | Reed switches are not suitable because one action could generate multiple pulses.\\ | ||
| In fact, current detection (or ground loop detection with Märklin) shows the same problem.\\ | In fact, current detection (or ground loop detection with Märklin) shows the same problem.\\ | ||
| - | IR gates also show the same problem, it is never sure that only one pulse is generated for each loc/ | + | IR gates also will not work, unless you will be 200% sure that only one pulse is generated for each loc/ |
| Hall-sensors are ideal for it.\\ | Hall-sensors are ideal for it.\\ | ||
| The large hysteris guarantees one pulse from each passing magnet.\\ | The large hysteris guarantees one pulse from each passing magnet.\\ | ||
| Line 65: | Line 65: | ||
| ===== The prototype board ===== | ===== The prototype board ===== | ||
| - | The usual item, to proove | + | The usual item, to prove that it works.\\ |
| | {{: | | {{: | ||
| \\ | \\ | ||
gca186-en.txt · Last modified: 2018/12/24 22:18 by smitt48