Motor

[toto11]

Hello,

**broken link removed**

I want read frequency via parallel prot (378) , using inpout32.dll .

could you help me with the code vb.net 2005

Regards

 

[toto11]

UP UP UP Up

 

[mneary]

It's extremely difficult to read an arbitrary frequency using the parallel port on modern computers. It's best to run an external counter for a known period of time (need a dependable time base) and then read the counter when it is complete.

 

[bananasiong]

Will the motor run on 12 V?

 

[toto11]

yes motor run on 12 V
but wire with connected with parallel port run on 5 V

 

[ericgibbs]

hi toto,
I have attached a Visual Basic 5 coding example, it may help.

Its an example I did for another member, it does work.

 

[bananasiong]

yes motor run on 12 V
but wire with connected with parallel port run on 5 V

Really?? Isn't this emitter follower? The voltage to the motor is 5 V - 0.7 V, because the driving transistor is the npn type. Or I'm wrong?

 

[ericgibbs]

Really?? Isn't this emitter follower? The voltage to the motor is 5 V - 0.7 V, because the driving transistor is the npn type. Or I'm wrong?

hi,
The drawing isnt very clear, but the collectors of the two motor drive transistors are connected to +/-12Vdc, so the motor should get a voltage -0.7V less than what is coming out of the Serial Port TXD pin.

If the Serial TXD swings +/-12V then the motor should get +/-11.3V approx.

 

[bananasiong]

hi,
The drawing isnt very clear, but the collectors of the two motor drive transistors are connected to +/-12Vdc, so the motor should get a voltage -0.7V less than what is coming out of the Serial Port TXD pin.

If the Serial TXD swings +/-12V then the motor should get +/-11.3V approx.

Ya, right. I forgot that serial port supplies up to 12 V.

Thanks