2 layers123.3 × 24.8 mm
DualPressure RS485
LSDRM/DualPressure-Thermocouple_forVMCGUI
A customized DAQ board through UART protocol, embeding two pressure sensors and one thermocouple. Has been developed to be used with VMCGUI.
43 parts
2 layers107.3 × 24 mm
DualPressure RS422
LSDRM/DualPressure-Thermocouple_forVMCGUIA customized DAQ board through UART protocol, embeding two pressure sensors and one thermocouple. Has been developed to be used with VMCGUI.
- Size
- 107.3 × 24 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 46
- Nets
- 41
- Pads
- 126
- Tracks, vias
- 295, 36
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 22 Jan 2024
- Updated
- 24 Jun 2026
Overview
DualPressure RS422 is an open-source printed circuit board by LSDRM, from the LSDRM/DualPressure-Thermocouple_forVMCGUI repository on GitHub. It is a 2-layer board of 107.3 × 24 mm with 46 parts on 41 nets, routed with 295 tracks and 36 vias.
It is built around the MAX3488EESA+, ADS122U04IPW and SK34A, with the FC681477 among its other parts. Its parts include 14 resistors, 8 diodes, 7 connectors, 6 capacitors and 3 ICs.
Main components
4
MAX3488EESA+
SOIC-8-40℃~+85℃ 1 1 250Kbps 3V~3.6V Thermal shutdown protection Transceiver SOIC-8 RS-485 / RS-422 ICs ROHSMaxim Integrated (Analog Devices)RS-485 / RS-422 ICs
ADS122U04IPW
TSSOP-16-40℃~+125℃ 1.024MHz、2.048MHz 2.3V~5.5V 24 2kHz 315uA 4 Built-in Built-in Built-in temperature sensor、Multiplexers、Integrated modulator、Built-in digital filter Sigma-Delta Support UART Yes TSSOP-16 Analog to Digital Converters (ADC) ROHSTexas InstrumentsAnalog To Digital Converters (ADC)
SK34A
SMA(DO-214AC)Schottky DiodesFUXINSEMIFC681477
-DC Power ConnectorsCliff
README
README.mdDualPressure-Thermocouple_forVMCGUI
A customized DAQ board through UART protocol, embeding two pressure sensors and one thermocouple. Has been developed to be used with VMCGUI. Need to be interfaced through an USB to UART module embeding an FT231X chip.
Hardware installation process
- Choose the standard you'll use between RS485 or RS422.
- I strongly recommend using the RS422 standard since the RS485 isn't optimal for this purpose, the connectors provided by the schematic (micro USB board-to-wire) are not easy to handsolder, and the RS485 version isn't up to date. A USB-to-UART module have been provided under the RS422 standard.
- You can find the ComponentList.txt text file in the RS422 folder, where all the components needed can be found.
- Gerber files are given, so you can directly order the electronic board through a PCB manufacturer.
- Solder all the components, and crimp the connectors.
Software installation process
This section assumes that you've already installed VMCGUI on your computer.
- Download and install the corresponding FT231X driver for your Operating System from the FTDI Chip website.
- After downloading and extracting this repository, go to the repository folder in your command prompt and run the following command :
pip install -r "requirements.txt" - Append the DualPressure - Thermocouple.py file to the "APP/Kits" folder of VMCGUI.
- Append the file(s) from the "libs" folder of this repository to the "APP/Kits/libsForKits" folder of VMCGUI.
- Then, plug the power to your DAQ board and connect it to the computer through the USB to UART module.
Parts
46| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | SK34A | SamacSys_Parts:DIOM5126X230N | D2, D3, D4, D5, D6, D7 |
| 5 | 47 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R3, R4, R5 |
| 4 | TestPoint | TestPoint:TestPoint_THTPad_D2.5mm_Drill1.2mm | P5, PW0, RX0, TX0 |
| 3 | 200 | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R11, R12, R13 |
| 2 | 10n | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C3, C4 |
| 2 | 120 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R0, R10 |
| 2 | 1M | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6, R7 |
| 2 | 1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R8, R9 |
| 2 | ABP2D | SamacSys:ABP2D | ABP2D0, ABP2D1 |
| 1 | 1000u | Capacitor_SMD:CP_Elec_10x10.5 | C1 |
| 1 | 100u | Inductor_SMD:L_0805_2012Metric_Pad1.15x1.40mm_HandSolder | L0 |
| 1 | 100u | Capacitor_SMD:CP_Elec_8x10.5 | C0 |
| 1 | 10u | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C5 |
| 1 | 1u | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C2 |
| 1 | 2-1445057-3 | SamacSys:214450573 | J2 |
| 1 | 205338-0004 | SamacSys_Parts:2053380004 | J1 |
| 1 | ADS122U04IPW | SamacSys:SOP65P640X120-16N | IC1 |
| 1 | AM-K-PCB | SamacSys:AMKPCB | U0 |
| 1 | AP7333-33SAG-7 | SamacSys:SOT96P240X135-3N | REG1 |
| 1 | FC681477 | SamacSys_Parts:FC681477 | J0 |
| 1 | LM2576D2TR4-5G | SamacSys:D2TSUFFIX-CASE936A-02-ISSUEC | REG0 |
| 1 | LOGO | Logos:Mountain | G*** |
| 1 | LOGO | Logos:LSDRM_XL | G*** |
| 1 | MAX3488EESA+ | SamacSys:SOIC127P600X175-8N | IC0 |
| 1 | SBRT3U60SAF-13 | SamacSys:SODFL5226X110N | D0 |
| 1 | SK34A | SamacSys:DIOM5126X230N | D1 |
| 1 | TestPoint | TestPoint:TestPoint_THTPad_2.5x2.5mm_Drill1.2mm | GD0 |
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Questions
How big is the DualPressure RS422 PCB?
It measures 107.3 × 24 mm and has 2 copper layers, 1.6 mm thick.
What parts does the DualPressure RS422 use?
46 parts, built around the MAX3488EESA+, ADS122U04IPW, SK34A and FC681477. 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 DualPressure RS422 KiCad files?
From the LSDRM/DualPressure-Thermocouple_forVMCGUI repository on GitHub, at the commit this page was made from: the board is Electronic Boards/DualPressure-Thermocouple_RS422/DualPressure_RS422.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the DualPressure RS422 design in my own project?
Its repository states no licence, so its author keeps all rights: ask LSDRM before reusing the design.