Motor driver LMD18200T schematic

[blackietje]

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So I've finished drawing my first motor driver. Please bare with me as it is my first driver.

JP1 => JP5 Goes to motor

I have added a Shmitt trigger to condition the pulses coming from my encoder (PIN JP4)
I'll also try to use current sensing, i suppose i have to add this to an analog input port on my axon?
I've tried to add use battery monitor, like the schematic on this website. (JP11)

This board should be able to drive a 2,8A 12V DC motor. So before i start soldering it up, i'd like your experience to help me out and tell me if this board will do the trick.
My robot will use differential drive but because the LMD18200T only has one full h-bridge, i will have to make 2 of these boards. The other one is identical so i posted the drawing of only one motor driver (to be clear).
There could be a bunch of errors in the schematic, i'm only a starting robot hobbyist.

Thank you in advance for your advice

greetz

[blackietje]

Uploaded with ImageShack.us

Component List:

C1,C2,C3,C4:       10nF
C5,C6:          68nF
C9,C10:       220µF
C11,C12,13,C14:    470nF

R1,R5:          10kohm
R2, R6:       2,7Kohm

R3:          50K
R4:          yet to be determined (battery monitor)

X2: Left motor
X3: Right motor
X4: Supply

Description

So i got my act together and drew a new schematic. As the previous one was for the most part based on another schematic that i adapted to my needs, this one is for me far more readable as i draw the connections instead of just putting GND and VCC symbols everywhere (confuses me). It also has a few 'improvements'. Screw clamps for motors and supply instead of pinheaders. I searched the net on how to connect the current sensing and added the battery monitor properly.

Still have a few questions tough:

The 74HCT13N IC contains 2 Shmitt triggers, so the ones you see in the schematic are part of the same IC. My problem is how do i supply this IC, as it needs 5V. Do i manually have to draw it in my eagle board? There is no pin in the eagle schematic to connect it to some sort of supply. I would take a 5V regulated from the axon and have it supply this IC.

Do i need a fuse?

What is the common method for connecting the axon microcontrollerboard to a seperate motor driver. I use the pinheaders, but i'm a bit unsure if this is good for connecting it to my axon.

Plz tell me if there are mistakes in the schematic, there probably are still some left but it's a much better one then my first (imo)



Thank you!

[Soeren]

Hi,

Please use the "monochrome" feature when exporting schematics from the v5+ of Eagle, as they have P*** poor color contrast.

This keeps me from going above V4.16, even though the newer versions have better controls - They simply take too much time and brain power deciphering, they took a large step ahead with version 5, but the missing contrast means they F'd up badly anyway

[blackietje]

so this is the monochrome version?

Direct Link:

http://img411.imageshack.us/f/boardl.png/


Can't seem to get the image big enough in this forum, don't know why. Probably cuz i'm newb at forum posting