2 layers40 × 120 mm
Photodiode board v3
0x23/nmWave-Interferometer
An Open Source Interferometer for Accurate Distance Measurements
65 parts151MIT
4 layers40 × 60 mm
Control board v2.0
0x23/nmWave-Interferometer151An Open Source Interferometer for Accurate Distance Measurements
- Size
- 40 × 60 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 106
- Nets
- 85
- Pads
- 331
- Tracks, vias
- 740, 251
- Pours
- 22
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 9 Nov 2024
- Updated
- 23 Sep 2026
Overview
Control board v2.0 is an open-source printed circuit board by 0x23, from the 0x23/nmWave-Interferometer repository on GitHub, published under the MIT licence. It is a 4-layer board of 40 × 60 mm with 106 parts on 85 nets, routed with 740 tracks and 251 vias.
It is built around the LMV321, PMEG4010CEJ and PRTR5V0U2X, with the BCX56 and IRLML6244 among its other parts. Its parts include 35 capacitors, 22 resistors, 11 diodes, 8 connectors and 6 ICs. It belongs with the STM32 boards of this library.
Main components
5
LMV321
SOT-23-5L-2.75V~-1.25V、1.25V~2.75V 0℃~+70℃ 1 10pA 10pA 1MHz 2.1V~5.5V 20mA 20nV/√Hz@10kHz 520V/ms 60uA 70dB 800uV Built-in compensation Rail-to-Rail Input, Rail-to-Rail Output SOT-23-5L Operational Amplifier ROHSJiangsu Changjing Electronics Technology (CJ)Operational Amplifier
PMEG4010CEJ
SOD-323F1 Independent 10A 1A 40V 50uA@40V 570mV@1A SOD-323F Schottky Diodes ROHSNexperiaSchottky Diodes
PRTR5V0U2X
SOT-143-55℃~+125℃ 0.3pF、0.8pF 100W 10V、15V 5V 6.5V 6A 80nA ESD IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 Three channels Unidirectional SOT-143 ESD and Surge Protection (TVS/ESD) ROHSTECH PUBLICESD And Surge Protection (TVS/ESD)
BCX56
SOT-89-3Lhfe=100~250Jiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)
IRLML6244
SOT-23-55℃~+150℃ 1 N-channel 1.1V 1.3W 20V 21mΩ@4.5V 6.3A 700pF 8.9nC@4.5V 98pF SOT-23 MOSFETs ROHSGuangdong HottechMOSFETs
README
README.mdAn Open Source Interferometer for Accurate Distance Measurements
The goal of this project is to provide plans and techniques for building an interferometer that can accurately measure changes in distance over a range of hundreds of millimeters with sub-micrometer precision. The objective is to use low-cost, widely available components and achieve a good balance between ease of manufacturing and performance.
This repository is currently work in progress...
[!WARNING]
This project involves collimated laser beams with power levels above eye-safe limits able to cause permanent eye damage. Please use proper precautions, do your own research, and respect laser safety guidelines.
Electronics
The KICAD design files for the electronics have been updated to the newest development version. The design is still work in progress but all functions have been successfully tested on a prototype.
CAD Models
[NEW DESIGN - Version 5] FreeCAD models of the design are now online, take a look!
Beam Splitter
The Beam splitter is made from regular float glass with a thickness of about 6 mm. It does not requre any coatings and uses the inherent reflectivity of glass surfaces. It is ground to size using a diamond wetstone and a series of 3D printed jigs. The models for 3d printing can be found here:
Laser Diodes
The current recommandation is the: $${\color{lightgreen}Osram \space PLT5 \space 516FA}$$ costing about 12$
For this project the laser source requires a long coherence length, which only certain laser diode models can provide.
Below is a table of laser diodes that I tested or want to test in future:
| Part Number | Nominal Current | Optimal Drive Current | Power | Wavelength | Notes | Plus on case |
|---|---|---|---|---|---|---|
| SLD3232VF | 55mA | ? | 50mW | 405nm | Not good | Yes |
| QL65E7SA | 50mA | 30mA | 7mW | 650nm | Good | Yes |
| QL65E7SB or C | 50mA | 30mA | 7mW | 650nm | Good | Yes |
| PLT520B | 225mA | ? | 110mW | 520nm | Very good (coherence length >4m) | Yes |
| PLT5 516FA | 100mA | 36mA | 30mW | 516nm | (Very) good (CURRENT CHOICE) | No |
| PLT5 520EB_Q | - | ? | 20mW | 520nm | Not tested (datasheet suggests very good) | No |
| PLT5 450(G)B | 80mA | 21mA | 100mW | 450nm | Okay | No |
| PLT5 520DB | - | ? | 10mW | 520nm | Not tested (probably not good) | No |
| PLT5 518FB_P | - | ? | 30mW | 518nm | Not tested (probably not good) | No |
Photo Diodes
For the project fast photodiodes for the visible spectral range are required. Silicon PIN Photodiodes satisfy these requirements and are readily available. To get a good signal a small active area of about 1mm² without a lens is prefereable.
The current choice is the $${\color{lightgreen}SFH229}$$ photodiode in a 3mm LED casing costing about 0.70$.
It is sensitive in the range of 380 nm bis 1100 nm and has a switching time of 10ns. To to reduce the footprint and remove the lense a 3D printed jig and sandpaper can be used. Mor information on this subject is coming soon..
Parts
106| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | 0.1µF | Capacitor_SMD:C_0603_1608Metric | C4, C7, C10, C14, C15, C16, C17, C19, C22, C24, C26, C28, C31, C34, C35 |
| 8 | 10µF | Capacitor_SMD:C_0603_1608Metric | C3, C5, C6, C8, C11, C12, C13, C18 |
| 5 | 10K | Resistor_SMD:R_0603_1608Metric | R4, R7, R11, R17, R18 |
| 4 | 100pF | Capacitor_SMD:C_0603_1608Metric | C9, C27, C32, C33 |
| 4 | 1µF | Capacitor_SMD:C_0603_1608Metric | C20, C21, C23, C25 |
| 4 | 4K7 | Resistor_SMD:R_0603_1608Metric | R8, R9, R14, R15 |
| 4 | FerriteBead | Inductor_SMD:L_0603_1608Metric | FB1, FB2, FB3, FB4 |
| 4 | MountingHole | MountingHole:MountingHole_2.7mm_M2.5_ISO14580_Pad | H1, H2, H3, H4 |
| 4 | PMEG4010CEJ | Diode_SMD:D_SOD-323F | D1, D2, D3, D8 |
| 4 | PRTR5V0U2X | Package_TO_SOT_SMD:SOT-143 | D5, D9, D10, D11 |
| 3 | 1.5k | Resistor_SMD:R_0603_1608Metric | R20, R21, R22 |
| 3 | LED | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D4, D6, D7 |
| 3 | TestPoint | TestPoint:TestPoint_THTPad_D1.0mm_Drill0.5mm | TP5, TP6, TP7 |
| 2 | 100K | Resistor_SMD:R_0603_1608Metric | R10, R13 |
| 2 | 10µF, 16V | Capacitor_SMD:C_0805_2012Metric | C1, C2 |
| 2 | 15pF | Capacitor_SMD:C_0603_1608Metric | C29, C30 |
| 2 | 33k | Resistor_SMD:R_0603_1608Metric | R12, R19 |
| 2 | MHF_SMD | ConMFH_SMD:LINX_CONMHF1-SMD-T | J3, J8 |
| 1 | 0 | Resistor_SMD:R_0603_1608Metric | R16 |
| 1 | 10 | Resistor_SMD:R_MiniMELF_MMA-0204 | R5 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 12V | Connector_AMASS:AMASS_XT30U-F_1x02_P5.0mm_Vertical | J1 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 2K | Potentiometer_THT:Potentiometer_Bourns_3266X_Horizontal | RV1 |
| 1 | 3.3K | Resistor_SMD:R_0603_1608Metric | R6 |
| 1 | BCX56 | Package_TO_SOT_SMD:SOT-89-3 | Q1 |
| 1 | Conn_PDBoard | Connector_Molex:Molex_PicoBlade_53261-1271_1x12-1MP_P1.25mm_Horizontal | J5 |
| 1 | DCDC_3.3V | DCDC_Converter:DCDC_17mmx12mm | U2 |
| 1 | Display | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | IRLML6244 | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | LMV321 | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | MCP1700x-300xxTT | Package_TO_SOT_SMD:SOT-23 | U1 |
| 1 | MCP1825S | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U4 |
| 1 | MCP3426Axx-xSN | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U5 |
| 1 | MJ-12.000-33412 | Crystal:Crystal_SMD_5032-4Pin_5.0x3.2mm | Y1 |
| 1 | PA0 | TestPoint:TestPoint_THTPad_D1.0mm_Drill0.5mm | TP1 |
| 1 | PC1 | TestPoint:TestPoint_THTPad_D1.0mm_Drill0.5mm | TP2 |
| 1 | PC2 | TestPoint:TestPoint_THTPad_D1.0mm_Drill0.5mm | TP3 |
| 1 | PC3 | TestPoint:TestPoint_THTPad_D1.0mm_Drill0.5mm | TP4 |
| 1 | PRMG | Connector_PinHeader_2.54mm:PinHeader_2x04_P2.54mm_Vertical | J7 |
| 1 | STM32G431RBTx | Package_QFP:LQFP-64_10x10mm_P0.5mm | U6 |
| 1 | SW_Boot | Button_Switch_SMD:SW_SPST_SKQG_WithoutStem | SW2 |
| 1 | SW_Reset | Button_Switch_SMD:SW_SPST_SKQG_WithoutStem | SW1 |
| 1 | TestPoint | TestPoint:TestPoint_Bridge_Pitch2.54mm_Drill0.7mm | TP8 |
| 1 | UART1 | Connector_JST:JST_PH_B4B-PH-K_1x04_P2.00mm_Vertical | J4 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Amphenol_10118194_Horizontal | J6 |
The 104 most common of 106 parts.
More from 0x23/nmWave-Interferometer
2- 2 layers24.5 × 12.7 mm
LaserDiodeBoard v2
0x23/nmWave-Interferometer
An Open Source Interferometer for Accurate Distance Measurements
19 parts151MIT
Similar boards
- 2 layers139.5 × 130.8 mm
- 4 layers368.2 × 159.8 mm
- 2 layers55 × 100 mm
- 2 layers17.4 × 12.6 mm
TC4056-Bypass
DoImant/TP4056-Power-Path-PCB
TP4056 Power Sharing PCB. Charge battery despite connected load.
8 parts52CC-BY-SA-4.0 - 2 layers99.7 × 49.5 mm
- 2 layers72.6 × 65.5 mm
- 2 layers42 × 42 mm
ControllerBoardSingle v1
0x23/BallJointEmbossingMachine
A motorized linear embossing machine designed to precisely press ball joints. It was designed to automate the production of balljoint linkages for the Open-Micro-Manipulator.
20 parts9MIT - 2 layers75 × 100 mm
Questions
How big is the Control board v2.0 PCB?
It measures 40 × 60 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Control board v2.0 use?
106 parts, built around the LMV321, PMEG4010CEJ, PRTR5V0U2X and BCX56. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Control board v2.0 KiCad files?
From the 0x23/nmWave-Interferometer repository on GitHub, at the commit this page was made from: the board is electronics/control_board_v2.0/control_board_v2.0.kicad_pcb and its schematic electronics/LaserDiodeBoard_v2/LaserDiodeBoard_v2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Control board v2.0 design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).