uno v3 3 stepper controller l293d

Projects General Guidance
1

ok my first post guys, I have Jut recently found arduino and to be honest i have fallen in love

I am looking to create a cnc type machine mainly i just have a few questions on how to set it up

parts:

  1. arduino uno
  2. 3x L293D ICs
  3. 7508 voltage regulator
  4. 2x 10 uf caps (50v)
  5. 6x 4 pin headers
  6. 30v .83a power source (printer power)
  7. 3x bipolar steppers (salvaged from printers, m35sp-9 (24v); m35sp-7t (6v); m42sp-6nka (24v)

mainly i have questions on if my layout will work or if i need more caps

I believe I have it right, i know with that i can't run more than 1 of the 24v and the 6v at the same time

the main thing I'm not sure on is

  1. am 1 allowed to use dig pin 1 (tx) since i plan to have the uno connected to the pc for gcode.
  2. do i need a 100uf cap between the 30v and L293D pin 8's.
  3. do i need 0.1uf caps between each motors a1<->a2 and b1<->b2's.
  4. do i need to regulate the voltage on the 6v stepper? if so what would be a good way to do it?

thank you in advance

2

update:

alternative power supplies

i have 2 32/16vdc printer power supplies (has 3 output pins {32vdc grnd 16vdc})

my L293ds should be in sometime within the next few days

3

Hello
I want to make a cnc with arduino but I have a problem with L293D.

When 3 motors are rotating ,they lost speed and power.
Could you help me please.
I'm using 3 steppers motors 350Am 12v, 3 L293d , arduino mega 2560,power supply ATX 800w 30A pc
thanks

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4

Hello
I want to make a cnc with arduino but I have a problem with L293D.

This is Tgrwilde's post. If you have a problem , start your own post. Otherwise the Moderator may notice
and order you to do it. We like to keep posts separate because the replies are problem specific and a reply for one L293 issue may not apply to another.

@Tgrwilde,
Do you absolutely HAVE to use L293s ? You would be much better off with a chopper driver like the RAMPS
A4988 or Pololu A4988. If you are interested in those let us know and we'll post links.

I'm not going to trace all the wires in your circuit. If you
don't know how to draw a schematic, post a wiring list that shows what arduino pin goes to what L293 pin
or power supply voltage or ground. Fritzings are not schematics and take more time to process because you have trace each wire whereas a wiring list can be quickly compared against the datasheet.

Is this YOUR schematic ?

1- It only shows one motor.
2- Have you tested your motors yet ? (if so , with what code ?)

There are many links on Google to L293 stepper motor code. Please post your code or code you have actually run and tested or state whether or not you have any code or have done any testing.
That information is part of what I like to call a SITREP (SITUATION REPORT).
Please post a SITREP.

. am 1 allowed to use dig pin 1 (tx) since i plan to have the uno connected to the pc for gcode.

NO.
2. do i need a 100uf cap between the 30v and L293D pin 8's.
YES
3. do i need 0.1uf caps between each motors a1<->a2 and b1<->b2's.
NO
4. do i need to regulate the voltage on the 6v stepper? if so what would be a good way to do it?
YES
LM2596 BUCK SWITCHING REGULATOR

5

Look at stepper motor basics. If you want to make a CNC machine don't use L293 / L298 h-bridge drivers.

...R