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Topic: Solenoid & Stepper Motor power problem. PROTECT ME! (Read 3 times) previous topic - next topic

GuyJustHere

Purpose:
Rotate a  4 wire bipolar stepper motor (32.6 ohm) & activate a solenoid (13.3 Ohm) at different times. Using H-bridge ( LN298 4A) for the stepper & N-Mostfet (tp120) for solenoid.

INPUT
I have burnt multiple 1A H-bridges when using the same power source for all (19V  4.74A).
So, I use a 19V 4.74A for the motor & a 12V 2A for the solenoid. (This sucks)
Arduino is running of USB (Already burnt out an arduino when then other H-bridge blew, so i scared)

Parts
Motor https://www.sparkfun.com/products/9238
Solenoid https://www.sparkfun.com/products/10391
H-Bridge https://www.sparkfun.com/products/9479

PROBLEM
POWER! How do i safely power this, or MORE, with one power supply? I keep burning things out when I try to use one power supply...
I thought the 19V 4.74A voltage supply would work, but it burnt out my arduino and three 1 amp H bridges.. womp womp...

PLEASE HELP ME OPTIMIZE MY LAYOUT. ESPECIALLY BECAUSE I WILL BE ADDING 2 MORE to THE SAME CIRCUIT. (3 motors 3 solenoids 1 ardiuno) (+LEDs & bla bla). POWER PROTECTION; HOW??


holmes4

First Why have you got the 5v output of the uno going to your breadboard?

Second Why do you (think have two Earth's on the upper (in the pic) rails of the breadboard?

Third How are you powering the uno?

Mark

John_S

Show us exactly how you have the H-Bridge connected. "Not Shown Correctly" doesn't help us.

GuyJustHere

#3
Nov 29, 2012, 02:29 am Last Edit: Nov 29, 2012, 02:33 am by GuyJustHere Reason: 1
I need the 5v for the LN298 H-bridge... (also, I use it for LEDs and another IR sensor)

I cannot find the LN298 in the frittzing software, but I have both outputs enabled and it works correctly. (no caps  resistors diodes used). I am trying to draw up a custom part now. Bear with me, because I am learning Fritzing as I go...


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