Pololu Extruder Stripboard
Release status: concept
Description | Pololu Extruder Stripboard
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License | GPL
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Contents
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
Under Construction...
Split 12v Power
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
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
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.