Pololu Extruder Stripboard

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Revision as of 23:48, 8 August 2010 by Tbuser (talk | contribs) (Assembly)
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Pololu Extruder Stripboard

Release status: concept

Pololu breadboard wiring overview.jpg
Description
Pololu Extruder Stripboard
License
GPL
Author
Contributors
Based-on
Categories
CAD Models
External Link


Introduction

The idea is to make a dead simple stripboard mounted Pololu A4983 Stepper Motor Driver and connect it to the existing RepRap electronics in order to bypass the noisy inefficient 2 H-bridge hack on the extruder controller. (at least until an all Pololu Electronics PCB design matures) I have it working with a temporary breadboard setup, but a better solution would be to mount it on stripboard...

Parts

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Assembly

Split 12v Power

Pololu stripboard power.jpg

12v needs to split. Half goes to extruder controller for the heater, etc. The other half goes to the new Pololu board. Do the split just like you do for the power plug on your Mendel.

Solder Stripboard Mount

Pololu stripboard diagram.jpg

Pololu stripboard front.jpg Pololu stripboard back.jpg

On the bottom right in the picture a 4 pin header is used, but only 2 pins are needed there for the 12v and GND

Wiring

Pololu stripboard mounted.jpg

4 pins on top right corner of motherboard. 5v, GND, SDA (to STEP), and SCL (to DIR) on Pololu board. 12v and GND from cholocate block split above. Make sure you cross over the SCL and SDA wires to the DIR and STEP pins on the stripboard since the Pololu board's 4 pins are in a different order.

Firmware Changes

In motherboard firmware's configuration.h change E0_STEPS_PER_MM to 32 for 1/16 microstepping.