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gca186-en [2018/12/24 16:28]
phg [Why hallsensors?]
gca186-en [2018/12/24 22:18]
smitt48 [The prototype board]
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 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 ​under the train. see [[http://​wiki.rocrail.net/​doku.php?​id=gca173-en|GCA173]]\\+Next we need hall sensors to be mounted between the sleepers, so that any magnet ​under the train will be detected. see [[http://​wiki.rocrail.net/​doku.php?​id=gca173-en|GCA173]]\\
 **NOTE:​** ​ For a one way traffic, only sensor A and C are needed!\\ **NOTE:​** ​ For a one way traffic, only sensor A and C are needed!\\
 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.\\
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 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,​ nor can it service double track with each two direction driving.\\ This board cannot service more than doubletrack,​ nor can it service double track with each two direction driving.\\
 That would need many more sensors , which there is no input for.\\ That would need many more sensors , which there is no input for.\\
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 ===== 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 problemit is never sure that only one pulse is generated for each loc/​waggon/​coach.\\+IR gates also will not workunless you will be 200% sure that only one pulse is generated for each loc/​waggon/​coach.\\
 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.\\
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 ===== The prototype board ===== ===== The prototype board =====
-The usual item, to proove ​that it works.\\+The usual item, to prove that it works.\\
 |  {{:​gca:​gca186_pict03.png}} ​ | |  {{:​gca:​gca186_pict03.png}} ​ |
 \\ \\
gca186-en.txt · Last modified: 2018/12/24 22:18 by smitt48