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Lens-Maker PCB

Creative Commons License

This repository contains the design files for a printed circuit board (PCB) that enables the control of three stepper motors using an A4988 driver and an ESP32-WROOM32E microcontroller module. The PCB provides a compact and convenient solution for incorporating stepper motor control into your projects.

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Overview

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The purpose of this PCB design is to simplify the process of controlling three stepper motors in your projects. By integrating an A4988 driver and an ESP32-WROOM32E module on a single board, you can easily interface with the motors and leverage the features of the ESP32 for advanced control and communication capabilities. In this design in particular three 2(A) stepper motors where needed to be controlled for a lens maker lathe, and the PCB was designed to fit the casing of the lathe.

Features

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  • Compact: The PCB is designed to be as small as possible while still providing the necessary features for stepper motor control.
  • Integrated A4988 Driver: The A4988 driver is integrated into the PCB, eliminating the need for a separate driver module.
  • Integrated ESP32-WROOM32E Module: The ESP32-WROOM32E module is integrated into the PCB, eliminating the need for a separate microcontroller module.
  • Integrated WiFi and Bluetooth Antennas: The ESP32-WROOM32E module includes integrated WiFi and Bluetooth antennas, eliminating the need for external antennas.
  • Integrated Power Supply: The PCB includes a 5V power supply that can be used to power the ESP32-WROOM32E module and the A4988 driver.
  • Integrated USB to UART Converter: The PCB includes a USB to UART converter that can be used to program the ESP32-WROOM32E module and communicate with it via serial.
  • Integrated Reset Button: The PCB includes a reset button that can be used to reset the ESP32-WROOM32E module.
  • I2C, SPI and GPIO Headers: The PCB includes headers that can be used to connect I2C, SPI and GPIO devices to the ESP32-WROOM32E module.
  • JTAG Header: The PCB includes a header that can be used to connect a JTAG debugger to the ESP32-WROOM32E module.
  • USB-C Connector: The PCB includes a USB-C connector that can be used to power the PCB and communicate with the ESP32-WROOM32E module via USB.

Repository Structure

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The repository is organized as follows:

  • Lens-Maker: This directory contains the Altium design files for the PCB.
    • Project Outputs for Lens-Maker: This directory contains the Output files of the project.
      • GerberX2: This directory contains the Gerber files of the PCB.
      • Lens-Maker_Schematic.PDF: This file contains the PDF of the PCB.
      • ExportSTEP: This directory contains the 3D model of the PCB.
      • BOM: This directory contains the Bill of Materials of the PCB.
  • docs: This directory contains the documentation images for the PCB.
  • LICENSE: This file contains the license for the PCB design.
  • README.md: This file contains the documentation for the PCB design.

PCB Design

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This PCB was design using Altium Designer 23.4.1. The PCB design files can be found in here. The PCB was designed to be as small as possible while still providing the necessary features for stepper motor control. The PCB is a 6-layer board with the following stackup:

The PCB was designed to fit the casing of the lens maker lathe, and the dimensions of the PCB are as follows:

Microcontroller

Design

The design of this PCB starts at the desition of the MCU chosen for this purpose. Because of its simplicity and WiFi and Bluetooth antennas already integrated, an ESP32-WROOM-32E is chosen for this design. The main advantages of choosing this microcontroller are:

  • The form factor: Its a MCU with WLAN capabilities in a size of a regular MCU.
  • Antennas integrated: The benefits of using an ESP32 module and not an ESP32 MCU is to have the antennas already routed an integrated.
  • Easy to use: Its many integration generated that ESP32 is a widely used MCU around the world, and this means there's a lot of information and resources to program this MCU.
  • Versatility: If there is a future design, a new ESP32 module can be changed and the software will 'just work'.

Stepper Driver

Design

For the Stepper driver, since this design is a prototype approach for the final goal, an A4988 driver was chosen, because of its previous use on a concept desing using the A4988 module from arduino. For future progress a driver change is needed to drive more heavy power Stepper motors. However this driver has a lot of advantages, its ease of use and simplicity makes it really easy tu use and code it, and its application in its own module has the heritage needed for the circuit to rely on.

Schematic

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The Schematic of this PCB can be found in here. And below are some images sumarizing it.

Bill of Materials

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Designator Footprint Value Manufacturer Manufacturer Part Number Supplier Supplier Part Number Description Quantity
C1_1, C1_2, C1_3, C2_1, C2_2, C2_3, C4_1, C4_2, C4_3, C5_1, C5_2, C5_3, C16, C24_1, C24_2, C24_3 0805 100nF YAGEO CC0805KRX7R9BB104 JLCPCB C49678 50V 100nF X7R ±10% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHS 16
C3_1, C3_2, C3_3 0805 220nF Samsung Electro-Mechanics CL21B224KBFNNNE JLCPCB C5378 50V 220nF X7R ±10% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHS 3
C6_1, C6_2, C6_3, C7_1, C7_2, C7_3, C15, C17, C18, C19, C20, C21, C22, C23 0805 4.7uF Samwha Capacitor CS2012X7R475K350NRE JLCPCB C560882 35V 4.7uF X7R ±10% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHS 14
C8_1, C8_2, C8_3, C9_1, C9_2, C9_3, C10_1, C10_2, C10_3, C11, C12, C13, C14 1206 47uF TDK C3216X5R1E476MTJ00E JLCPCB C76659 25V 47uF X5R ±20% 1206 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHS 13
D1, D2 0805 Hubei KENTO Elec C2297 JLCPCB C2297 0805 Light Emitting Diodes (LED) ROHS 2
H1, H2, H3, H4, H5 HOLE_M3 Hole M3 5
P1 DC-005 2.0 BOOMELE(Boom Precision Elec) DC-005 2.0 JLCPCB C16214 Shrouded DC Power Receptacle 2mm 6.4mm Plugin AC/DC Power Connectors ROHS 1
P2, P3, P4 1727036 Phoenix Contact 1727036 JLCPCB C457200 TERM BLK 4P SIDE ENT 3.81MM PCB 3
P5 1727010 Phoenix Contact 1727010 JLCPCB C89123 TERM BLK 2P SIDE ENT 3.81MM PCB 1
P6 PZ254V-11-05P XFCN PZ254V-11-05P JLCPCB C492404 Straight Square Pins 2.5mm 6mm -40℃~+105℃ 3mm 5 2.54mm Black Brass 1x5P Plugin,P=2.54mm Pin Headers ROHS 1
P7, P8, P9_1, P9_2 HEADER 3X2 BOOMELE(Boom Precision Elec) C65114 JLCPCB C65114 Straight 2 6 2.54mm Black Straight,P=2.54mm Pin Headers ROHS 4
P10 TYPE-C-31-M-12 Korean Hroparts Elec TYPE-C-31-M-12 JLCPCB C165948 USB C SMD Connector 1
Q1, Q2 SOT-23-3 JSMSEMI S8050 JLCPCB C916390 25V 300mW 500mA SOT-23 Bipolar Transistors - BJT ROHS 2
R1_1, R1_2, R1_3, R9, R11, R12, R14_1, R14_2, R14_3, R15_1, R15_2, R15_3, R16_1, R16_2, R16_3, R21 0805 10K UNI-ROYAL(Uniroyal Elec) 0805W8F1002T5E JLCPCB C17414 125mW Thick Film Resistors ±1% 10kΩ 0805 Chip Resistor - Surface Mount ROHS 16
R2_1, R2_2, R2_3 0805 0R PANASONIC ERJ6GEY0R00V JLCPCB C169855 125mW 0Ω 0805 Chip Resistor - Surface Mount ROHS 3
R3_1, R3_2, R3_3, R5_1, R5_2, R5_3 0805 50m YAGEO PE0805FRF7W0R05L JLCPCB C858613 250mW ±1% 50mΩ 0805 Chip Resistor - Surface Mount ROHS 6
R4_1, R4_2, R4_3, R6_1, R6_2, R6_3 0805 100K FH (Guangdong Fenghua Advanced Tech) RS-05K104JT JLCPCB C118844 125mW ±5% 100kΩ 0805 Chip Resistor - Surface Mount ROHS 6
R8 0805 1K6 Resistor.Today AECR0805F1K60K9 JLCPCB C352253 125mW Thick Film Resistors ±1% 1.6kΩ 0805 Chip Resistor - Surface Mount ROHS 1
R10, R13, R17, R22 0805 470R UNI-ROYAL(Uniroyal Elec) 0805W8F4700T5E JLCPCB C17710 125mW Thick Film Resistors ±1% 470Ω 0805 Chip Resistor - Surface Mount ROHS 4
R18 0805 5.1M TA-I Tech RM10FTN5104 JLCPCB C156163 125mW Thick Film Resistors ±1% 5.1MΩ 0805 Chip Resistor - Surface Mount ROHS 1
R19, R20 0805 2K2 LIZ Elec CR0805J80222G JLCPCB C101970 125mW Thick Film Resistors ±5% 2.2kΩ 0805 Chip Resistor - Surface Mount ROHS 2
S1, S3 PUSHBUTTON_2 C&K PTS645SM43SMTR92LFS JLCPCB C221880 SWITCH TACTILE SPST-NO 0.05A 12V 2
S2_1, S2_2, S2_3 SDA03H0SBR C&K SDA03H0SBR JLCPCB C221950 SWITCH SLIDE DIP SPST 25MA 24V 3
TP1, TP2, TP3, TP4, TP5 5015 Ronghe RH-5015 JLCPCB C5199798 Thimble/Copper Rod/Test Ring ROHS 5
U1_1, U1_2, U1_3 28-QFN Allegro MicroSystems, LLC A4988SETTR-T JLCPCB C38437 IC MTR DRVR BIPOLAR 3-5.5V 28QFN 3
U2 ESP32-WROOM-32E Espressif Systems ESP32-WROOM-32E-N4 JLCPCB C701341 RX TXRX MOD WIFI TRACE ANT SMD 1
U3 CP2102N SILICON LABS CP2102N-A02-GQFN28R JLCPCB C964632 QFN-28 USB ICs ROHS 1
U4 SOT-223 Shenzhen Fuman Elec AMS1117-3.3V JLCPCB C173386 IC-1117 V.reg. 1A 3V3 SOT223 SMD Ams 1

Fabrication Instructions

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The fabrication instructions can be found in here and the Gerber files are located in this directory. For the PCBA the assembly drawing can be found here.

3D Model

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A 3D model of the PCB is available for the design and manufacture of the lathe casing located in here.

Some pictures

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Contributing

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Please do not hesitate to reach out to me if you find any issue with the code or if you have any questions.

License

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Creative Commons License

Copyright 2023 Ian Cruz Diaz. 

This project and all its components, including the PCB design files, Schematics and Output Files are 
licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. You 
can find a copy of the License at ./LICENSE.md or at https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode.