A studant in need!!!

Y

your mum

New Member

• Jan 10, 2005

• #1

Hello! Im a student in need of help!

Is there anyone that can tell me how to effectivly boost the output power of a L293D chip when its in conjunction with a PIC chip. my robot moves like a slug. I know one way is to stack them on top of each other or but i want to see if there are any altenatives.

Thanks

 

bloody-orc

New Member

• Jan 10, 2005

• #2

first look how many amps your motor needs to run.

and be shure not to mesure the amps used in free run... try to mesure the real and maximum current your motor needs.

and then see if it stays under 0,6A.
if not then yes you need two (or more) chips stacked or need to construckt a new h-bridge.

 

firsthightower

New Member

• Jan 10, 2005

• #3

HI!

i've added a drawing of an H-bridge that is controlled with any HIGH - LOW output. The 4 little chips (4427) just switches the voltage of the motor depending what the logic output of your Microcontroller is. However this drawing is in the topic : "How to control 9V motor with digital out".

goodluck.

a student.

 

Y

your mum

New Member

• Jan 11, 2005

• #4

Thanks for that!! i'll have a go.

But i need to concider other possibilities so does anyone know how to connect a L293D chip up with a ULN2003A chip to boost its power.

 

bloody-orc

New Member

• Jan 11, 2005

• #5

nope uln can let less current through it then LM 500mA for ULN and 600mA for LM if you put uln between LM and motor it will reduce the power