Serial port to L293D...???

[iridium]

l293d rs232

Please help me.... i need to program serial port with VB6... do enuone knows how to conect and program serial port to L293D... Thanks!! Ognjen, Serbia

 

[glenjoy]

l293 parallel port

You will not be able to connect it directly. Better use a level converter IC, such as MAX232 or MAX233, and a microcontrolelr in between the PC and the L293D.

At least even w/o a specific visual Basic interface, you can control the motor via the L293D by just using hyperterminal.

 

[iridium]

l293 connect to parallel

"...hyperterminal".... i`m new in electronics and i`ll appreciate if you can explain it to me... Thank you!!!!
/Ognjen

 

[suromenggolo]

serial port l293 max232

hyperterminal is software for communication via serial port, in Windows 98 you can find it Accesoris->Communiction->hyperterminal
but this is only text mode type and you can send character only, but can not send hex type.

Added after 24 minutes:

how to conect and program serial port to L293D... Thanks!! Ognjen, Serbia

L293D have 4 input, you can direct control with serial port via RTS & DTS pin and control this via software, but must have 2 serial port like COM1 and COM 2
so between serial port and L293 must be conveter RS232 to TTL with MAX232 or ICL232 or MC1449.

 

[glenjoy]

rts dts voltage

crazy enough to control it by using two serial ports.

Just use a micro and one serial port.

 

[strombom]

If you don't want to use a microcontroller maybe you should consider using the parallel port...

 

[iridium]

Thanks guys... My project was based on pralell port, but then i found out thet my girlfrieds laptpot dont have a paralell prt... and this project i makin for her. Problem is that softwer for this bot must to work undr XP. I made scheme for connectin l293d with serial... first i need only two input pins(for only one motor), secend, there is one problem... dts and rts pins on serial port givin or -12 or +12v always so i figured that i can use some pnp trans... so when i turn on, for exemple rts pin it will feed pnp and it will let power to l293d input pin... that is same and for dts pin... what you think? THANKS!!
/ognjen

 

[glenjoy]

What I think is, stick with the MAX232 and a microcontroller.

 

[iridium]

Ok... How to use Max232...

 

[nicleo]

You can learn how to use from the datasheet:

**broken link removed**

 

[suromenggolo]

if you using microcontrolle for advance, but for simple circuit, you can direct RTS and DTS to PNP transistor and diode to block -12V, so output RTS and DTS voltage is 0 and +12V.

 

[iridium]

Yea... That was my idea to... So, i can do that... THANKS!

Added after 1 hours 32 minutes:

Hey guys can you tell me which pnp trans. to use... Thanks!
Ognjen

 

[suromenggolo]

you can use 2N2222 for NPN Transistor or 2N3906 for PNP transistor