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| Thread ID: 62577 | 2005-10-12 09:36:00 | door counter | jonp (7517) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 395551 | 2005-10-12 09:36:00 | Slightly outside the norm this one. I am looking to make a door counter that'll count the number of persons passing through my shop door. I have one of those buzzer beam thingys. Does anybody know if i can connect a counter within that system say bewtween the box of tricks and the speaker ? or whether it must be more complicated ? (By the way I am not looking to run this through the pc or anything fancy like that) thanks |
jonp (7517) | ||
| 395552 | 2005-10-12 18:51:00 | I think commercial products like this do exist... I have seen one somewhere, but can't remember where. You might want to try asking the regular places - DSE etc. | somebody (208) | ||
| 395553 | 2005-10-13 02:16:00 | If you look around you will probably be able to find a mechanical counter which is operated by pulses of 12V DC. Your existing (mains operated?) detector will almost certainly be easily "got into" to provide the pulse. If it's battery operated, it might be little more tricky, but still not difficult. You don't want an electronic counter --- it's too easy to lose the counts. (It's very easy to convert cheap calculators to work as counters). | Graham L (2) | ||
| 395554 | 2005-10-26 08:57:00 | If you look around you will probably be able to find a mechanical counter which is operated by pulses of 12V DC. Your existing (mains operated?) detector will almost certainly be easily "got into" to provide the pulse. If it's battery operated, it might be little more tricky, but still not difficult. You don't want an electronic counter --- it's too easy to lose the counts. (It's very easy to convert cheap calculators to work as counters). Graham You sound like you know what you're talking about here. I have managed to get a electro mechanical counter (off a photocopier) - took a while - and i have tried to stick it the line between the unit and the buzzer on the door entry beam. No counts. Either I am missing something serious here, or the fact me counter is 24v operated and the door sensor is 9v may have a bearing. Any suggestions ? Cheers |
jonp (7517) | ||
| 395555 | 2005-10-27 01:09:00 | It might squeak in with 9V, but I suppose it's asking a bit from a 24V coil. Copiers have some great parts in them, but they seem to use 24V a lot. You might need a relay and another power brick (or battery). How is the buzzer driven? If it's by a relay there might be a spare set of contacts. (A 12V light duty relay should work on 9V ... ). |
Graham L (2) | ||
| 395556 | 2005-10-27 02:37:00 | P.S. If you use a relay, it'll pay to have a diode (1N4004, etc) connected across the coil (with the band -- cathode --end to the positive side. That will stop the "inductive kick" upsetting things. ( A transistor driver would also like a protection diode across the counter coil.) | Graham L (2) | ||
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