Assembling the electronics

Introduction

The eMAKER Huxley 3D printer uses the Sanguinololu version 1.3a electronics to control all of its functions. This is powered from a 120W laptop power supply, and controls the hot end and heated bed, as well as axis motion. The Sanguinololu electronics can be configured in many ways, and the eMAKER Huxley kits have been put together with a specific bill of materials, all of which will be detailed below.

Standard Sanguinololu information

The RepRap wiki has a comprehensive guide to the Sanguinololu electronics here.

eMAKER changes to the standard electronics

• Screw terminals for power and heater outputs.

• Molex mini-fit Jr connectors for the heated bed and hot end wiring looms for easy (dis)connection.

• 12v cooling fan and Pololu stepper driver heatsinks supplied to keep the electronics cool.

• SMD heat sinks for the A4988 stepper drivers. These may be fitted using strips of heat transfer tape obtained from the back of the extruder fan.

Schematic

PCB Assembly

Part	Value	Device	Notes	Board
IC100	FT232RL		Surface mounted on the underside of the board.This can be done with a standard soldering iron and some flux. See these videos for inspiration:http://www.youtube.com/watch?v=bvo8Xj_yn3whttp://www.youtube.com/watch?v=t06malVew40
J1	USB		USB Type B socket
R2	100k		1/4 watt axial resistor
R3
R4
R5
R7
R8
R12
R1	1k		1/4 watt axial resistor
R9	4k7		1/4 watt axial resistor
R10
R6	10k		1/4 watt axial resistor
R11
LED1	LED		Red LEDThe short lead (negative) should be in the hole closer to the center of the board.
C6	0.1uF		Capacitor
C7
C8
C11
C13
C14
C15
Y1	16MHz		Resonator
IC2	40pin Sckt		ATMEGA644 socket, careful attention should be paid to the polarity of the socket.
			0.1″ Female headers
			0.1″ Male headers (use spare female headers to align the double headers. The two header sets (::::::: ::) in the bottom right corner also need to be aligned to take the SD breakout board)
C5	.33uF		Capacitor
			Microstep setting shunts. 12 required to set all axes to 1/16th microstepping, and one for the autoreset.
C16	4.7uF		Capacitor (shorter leg is for the hole marked with a “-”)
C9; C10	10uF		Capacitor (shorter leg is for the hole marked with a “-”)
C1 C2 C3 C4	100uF		Capacitor (make sure they lie flat like in the picture, as the stepper drivers will be slotted in over them)
C12	1000uF		Capacitor
	LM7805		Voltage regulator
			Mosfets for driving heaters
			Screw terminals for heater outputs and power input
			Reset switch
			Atmega 644P microcontroller

Stepper driver assembly

Part	Value	Device	Notes	Board
		A4988	Pololu Stepper driver
			0.1″ male header pin strip cut in half.
			0.1″ male header pins pushed into Sanguinololu female headers.
			A4988 stepper driver PCB dropped onto 0.1″ male header pins for soldering. (The heatsink can be attached to the A4988 chip later using the technique described in the Hot End assembly instructions. )

SDSL (Sanguinololu microSD daughter board)

Next step

Wiring