Open Frame Solenoids

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marlep

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I'm doing a school project now that uses an open frame solenoid to automatically open a drawer. I need help for the driver circuit for the solenoid. Can you pls give me some suggestions....
 
marlep said:
I'm doing a school project now that uses an open frame solenoid to automatically open a drawer. I need help for the driver circuit for the solenoid. Can you pls give me some suggestions....
Click to expand...
it depends upon how much current the solenoid will draw
 
Still about solenoids

the solenoid is an open frame 12V DC solenoid. can u pls give me some specifications and descriptions about the NA51 transistor?
 
Re: Still about solenoids

marlep said:
the solenoid is an open frame 12V DC solenoid. can u pls give me some specifications and descriptions about the NA51 transistor?
Click to expand...

u said only 12v , what about the resistance of that?
i'm sorry is didn't find anything for na51.. what r u going to do with it?
 
NA51 NPN 40x 45v 2.5MHz 4A (TO-220)
You will need a diode across the solonoid or the transistor will zap.
 
open frame solenoid

my project is a pc interfaced mini automated library using the parallel port. It consist of ten drawers which will automatically open (using solenoid to unlock the lock) once selected. I need some suggestions on what type of decoder will i use? Parallel Port-Decoder-Solenoid Driver-Solenoid-Drawer.
 
Since you don't have 10 outputs, use Do thru D3 in BCD and use a CD4028 BCD to decimal decoder, or 74145.
 
open frame solenoid

i need some suggestions on how to connect the sensor circuit of my project to the parallel port. The sensor will serve as an input, everytime the sensor is cut, it will update the database. There are 10 sensors.
 
Re: open frame solenoid

marlep said:
i need some suggestions on how to connect the sensor circuit of my project to the parallel port. The sensor will serve as an input, everytime the sensor is cut, it will update the database. There are 10 sensors.
Click to expand...
so ur sensor will(should) output 0-5V , connect it to the standard i/p pins (10,11,12,13,15) of the LPT , if u r using dos/linux+c/c++ , an inportb will get the pin status.
for 10 sensors u need to multiplex the data.
refer **broken link removed**
 
open frame solenoid

yes the output of my sensor is 0-5V. I'm using visual basic for the interfacing. can i use encoder for the 10 sensors?
 
sensor as an input to the parallel port

what multiplexer can i use to my 10 sensors? can i just connect it to pins D4-D7? D0-D3 are already used for my solenoid driver used to open the drawer. My project as a whole is like this, it is like an automated library. The user will login and borrow books using the computer. The books are placed individually in a drawer. Once a book inside that drawer is selected, the drawer will automatically open. There is a sensor placed on the drawer, if the user will get the book, the sensor will be cut. Once the sensor is cut, the database will be updated that, that book is unavailable already. Hope u'l have time to help me with this one. I'm already done with the drawer. my problem now is how to connect the sensor to the parallel port port which will serve as an input.
 
still on sensor connections to the parallel port

is there a multiplexer that has 10 inputs?
 
Re: still on sensor connections to the parallel port

marlep said:
is there a multiplexer that has 10 inputs?
Click to expand...

Give it a little thought?.

Three inputs allow 8 outputs (binary 0 to 7), four inputs (binary 0 to 15) obviously allow 16 outputs - 10 isn't a round binary number.

So you need four pins for a multiplexer, and ignore the six you don't need.
 
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