dual h bridge shield help

heres what i made:
http://s1019.photobucket.com/albums/af315/frostin2k8/?action=view&current=hbridgeshield.jpg
will this work by powering the arduino from the shield?

Edit: I seen a cool little laser project. Spirograph. I be using 3 12v dc fans.

I am not sure what you are asking?

will this work by powering the arduino from the shield?

This is just a PCB layout, without knowing what ICs you are using or how you are wiring it up I can't tell if it will work.

I am not clear about the "powering the arduino from the shield" bit. Generally you don't do this.

Its the 16 pin h bridge commonly found on the playground. so id need to step up the voltage and take out the regulator? i have the eagle board file if you want to look at it. i didnt make a sch

so id need to step up the voltage and take out the regulator?

No if you need more voltage than 5V then take it from an external power supply like a wall wart. For things like motors it is advisable to use an external supply anyway. See:- http://www.thebox.myzen.co.uk/Workshop/Motors_1.html

http://www.thebox.myzen.co.uk/Tutorial/Power_Supplies.html and http://www.thebox.myzen.co.uk/Tutorial/De-coupling.html

K. think ill just use a 12v wall wart to power the arduino and shield. Looks luke I can just take the power connector jack off the pcb and regulator. Looks like i canuse the 3.3v power for the laser diode. But my question is.. why on a driver schematic is the lm317 backwards? Thought Vin would be the left pin/prong, adjust in middle and Vout on the right pin...?

i only need the motors run one way. i could harvest steppers. if i only go one direction ill just need one chip if the current can handle it from the motors correct?basically high/low all i need. also im wanting to manually control the motors via pots. so could i just wire in a pot off the motor by itself and if i wanted the arduino to do a custom rotations, turn the pot down and power on tne arduino?

i only need the motors run one way.

In that case you only need half of the H bridge, connect one end of the motor to a power rail (+ or -) and the other end to one of the outputs of the H bridge.

also im wanting to manually control the motors via pots.

woo You just hit a whole other lode of stuff. What do you men by control, speed?

so could i just wire in a pot off the motor

No pots usually take only a very small amount of current, if you connect a regular pot to a regular motor you will fry the pot.

Do say what you want to do please.

I want to manuually control each motor with a knob. then be able if i wanted to to have the arduino do it with a written program turning on/off the motors via delay. Theres a guy who used a PIC but id rather use an arduino. and you see my question for the laser circuit? shouldnt voltage flow only one way through a regulator not backwards? heres the link: www.instructables.com/id/Laser-show-for-poor-man/

To control a DC motor with a pot, you'll need to wire the pot to 5V, GND, and one of the Arduino's analog inputs. You can then write code to read a value between 0 and 1023 from the analog pin, based on the position of the pot.

To convert this into motor speed control, you will take that value, divide it by 4 (to convert it to 0-255, the range of values for PWM'ing a motor) and analogWrite it to the port that your motor driver is connected to. Make sure you're using a PWM-capable port for that, they are marked as such on the Arduino PCB.

should i put in any capacitors? little better picture of board: http://img710.imageshack.us/i/hbridgeshield.jpg/

Ok I think I'm understanding more now. Basically wire 3 pots to 3 pwm pins. I could then add a button or switch for the arduino to automatically control them ( puttin the button in high/low) if high then it will automatically do a routine, if low I could manually do with the pots. Am I correct?