K8000 : Opening request for a cabinet lock from a computer

Kits PC Related Projects
1

Hi!

First, I will explain you my project :
The aim is to open and close doors for a clothingroom (the best would be 80 doors…)
So, I have to send 24V to an electrical system to open them. On this system, I also have 2 positions to know if the door is closed or opened.
All this would be requested by a computer working on Windows.

So in fact :
A member of the club will come in front of the screen, put his card in front of a barcode reader and the program gives him a door number and open it a few seconds later (the time that the member needs to get there).
When the member will want to leave, he will be able to get his door free with another barcode reader.

In the end, I need a card between the computer and the 80 electrical systems on the doors.
I was asking myself if the K8000 cards from Velleman would work? I’m worrying when I read in the specifications file that only 4 cards can be connected (1 master and 3 slaves)
If the cards doesn’t work, do you know another that would?

Thanks a lot for any answer and sorry for my english! If what I wrote is not understandable, I put the french version down.

Tony Neirynck

K8000 : commande d’ouverture de vestiaires à partir d’un PC

Bonjour,

Avant tout, je vous explique la théorie du projet que je dois réaliser :

Le but est de commander des portes de vestiaires (idéalement 80 portes).

J’ai donc 80 casiers (portes avec gâche électrique).

Sur une gâche, je dois envoyer du 24V pour ouvrir la porte et j’ai également un contact 2 positions qui me dit si la porte est ouverte ou fermée.

La commande de ce système est commandée par un Pc sous Windows.

Cas pratique :

Un membre se présente devant le Pc, il passe sa carte devant un lecteur code barre, le programme lui attribue alors un vestiaire disponible et la porte de celui-ci s’ouvre après 5 secondes. Le vestiaire pourra être libéré par le membre via un autre lecteur code barre.

Je suis donc à la recherche d’un interface entre le programme que je dois faire et les 80 gâches électrique des casiers.

Je me demande si la carte K8000 de Velleman pourrait convenir ? je m’inquiète de lire dans la documentation que c’est 4 cartes interconnectés (1 maitre et 3 esclaves) ?

Si cette carte ne convient pas, connaissez-vous d’autres cartes qui pourrait convenir ?

Merci de me renseigner à ce sujet.

Tony Neirynck

2

One alternative may be to use the K8061 cards. Using the digital and analog outputs you need 5 units to get 80 outputs.
But - you can’t control the relays directly from the analog outputs. You have to add transistors.

3

Hi !
Thank you so much for this answer!
That would be perfect! I just wonder : some people told me that it wasn’t possible to connect more than one card by USB… Are you sure we’ll be able to command the 5 cards from just one computer?
What do you mean by “transistor”? Will we need to put another card behind the first?
Thanks again!
Tony Neirynck

4

[quote]Are you sure we’ll be able to command the 5 cards from just one computer?[/quote] Yes it is possible to connect up to 8 cards (K8061) to one computer.
You’ll get 64 digital outputs. Those can be easily used to drive the relays.

[quote]What do you mean by “transistor”? Will we need to put another card behind the first?[/quote] Yes, if you use the analog outputs of the card to drive the relays, you have to do a separate card for the transistors.
It is much easier to use only the digital outputs.

5

That sounds great!

I just don’t understand what you mean by relays and transistors… Are the relays the electrical deadlocks on the doors that open/close them? What will do the transistors? Will they transform the 5V to 12V?

So, if I understand you well, as I need to open/close 80 doors :
I use only 5 cards, with those, I use 40 digital outputs directly to drive the electrical deadlocks and 40 analog outputs that will need transistors between the K8061 and the deadlocks.
Am I right?

Thank you again for your fast answers!

Tony Neirynck

6

[quote]So, if I understand you well, as I need to open/close 80 doors :
I use only 5 cards, with those, I use 40 digital outputs directly to drive the electrical deadlocks and 40 analog outputs that will need transistors between the K8061 and the deadlocks.
Am I right? [/quote]You are right.

Please check what is the current of the electrical deadlocks. Should be less than 100mA for direct connection to the digital outputs of the K8061.