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Arvinszhang edited this page Apr 14, 2019 · 52 revisions

Welcome to the 2D-Printer wiki!

Introduction

This project is a realtime writing machine, which enable user to write information remotely. This design controls the movement of the pen on the x and y axes through two stepping motors and the up and down movement of the pen through a servo motor. This Wiki page details how to recreate the machine.

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Hardware Design

Bill of Material

BOM for 2D Printer

component Description Quantity Supplier
NEMA-17 Stepper motor 2 onecall MC02060
SG90 Micro servo motor 1 eBay
Stepper motor coupler Flexible shaft couplings 5mm to 8mm stepper motor coupler aluminium alloy joint connector 2 Amazon
Screw rod 200mm 3D printer T8-2 8mm lead threaded screw rod linear rail bar shaft 2 Amazon
Brass nut Dia 22mm Brass 8mm 4-Start Flange Nut for CNC 3D Printer Rod Lead Screw 4 Amazon
M8 hexagon nut Toolcraft Hexagon Nuts DIN 934 Galvanised Steel 8 M8 4 Rapid 51-3428
Stainless steel solid rod 250mm*5mm 2
Type ①②③④ acrylic board The corresponding size and quantity can be found in datasheet 10

BOM for PCB

component Description Quantity Supplier
L293DNE Quadruple high current half-H driver 2 onecall 1470423
CTB0500/2 2 way 14 A low profile interlocking terminal block 5 Rapid 21-1540
CTB0500/3 3 way 14A low profile interlocking terminal block 1 Rapid 21-1545
M20-6102045 2.54mm pitch PC/104 40 connectors 1 Farnell 1569230
10ML100MEFC6.3X5 Electrolytic Capacitor, Miniature, 100 µF, 10 V, ML Series, ± 20%, Radial Leaded, 6.3 mm 1 Farnell 8126160

Wiring Diagram

wiring diagram

Servo Motor Control Motor Driver Board Control Stepper Motor Control
Raspberry Pi Servo Motor
Pin4(Power) 5V
Pin12(GPIO1) Signal
Pin20(Ground) Ground
Raspberry Pi L293D Drive Board
Pin31(GPIO22)/Pin32(GPIO26) Pin2(1A)
Pin33(GPIO23)/Pin36(GPIO27) Pin7(2A)
Pin35(GPIO24)/Pin38(GPIO28) Pin10(3A)
Pin37(GPIO25)/Pin40(GPIO29) pin15(4A)
L293D Drive Board Stepper Motor
pin3(1A) Red
Pin6(2A) Green
Pin11(3A) Yellow
Pin14(4A) Gray

PCB Design

PCB This 83mm*75mm double sided PCB is manufactured at University of Glasgow. There has some difficulties in the soldering process. All the files required to recreate this PCB can be found in PCB design folder of this repository.

Evaluation

*现况分析 around 40ms delay, the movement of 鼠标（显示器上图形会和实际绘画的图像有偏差）现在电机运行基于像素比较，实际运行中鼠标运动速度和电机运行速度不匹配，
*未来提升 pcb 无稳压源，电压随运行时间降低，导致电机运行 需要稳压源增加电源电压 控制笔换成更稳定的机械结构

Team Coordination

  • Wei Zhang - Hardware and software designer
  • Honghao Wang - Researcher and film editor
  • Huanyu Zhang - GitHub maintenance and material purchase

Social Media

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