2 layers101.6 × 53.3 mm
2 layers100 × 36 mm
OpenXPot
mcquintao/OpenXPotPlaca de condicionamento de sinal para Potenciostato de 3 Eletrodos, projetada para aplicações em eletroquímica e biossensores.
- Size
- 100 × 36 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 35
- Nets
- 27
- Pads
- 133
- Tracks, vias
- 179, 0
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 17 Aug 2026
- Updated
- 20 Aug 2026
Overview
OpenXPot is an open-source printed circuit board by mcquintao, from the mcquintao/OpenXPot repository on GitHub. It is a 2-layer board of 100 × 36 mm with 35 parts on 27 nets, routed with 179 tracks and 0 vias.
It is built around the LMC6482IN. Its parts include 12 capacitors, 9 resistors, 5 connectors and 2 ICs.
Main components
1README
README.md🔬 OpenXPot (v0.1)
🇧🇷
Placa de condicionamento de sinal para Potenciostato de 3 Eletrodos, projetada para aplicações em eletroquímica e biossensores.
⚠️ Status do Projeto (v0.1): Esta versão representa o primeiro protótipo enviado para fabricação e aguarda validação e testes experimentais em bancada.
🚀 Destaques da Versão 0.1 (Primeira Revisão de Hardware)
- Arquitetura Eletroquímica de 3 Eletrodos: Controle preciso de Contra-Eletrodo (CE), Eletrodo de Referência (RE) e Eletrodo de Trabalho (WE).
- Amplificador de Transimpedância (TIA) de Alta Sensibilidade:
- Estágio baseado no LMC6062 / LMC6482 (corrente de bias ultra-baixa de ≈ 10–20 fA).
- Ganho do TIA: 1 MΩ (1 V/µA).
- Faixa dinâmica de medição: ±1,65 µA com resolução na escala de sub-nanoamperes.
- Compensação de Queda Ôhmica (iR Drop Compensation):
- Malha de realimentação positiva com trimpot (
RV1) acionável por jumper (JP1).
- Malha de realimentação positiva com trimpot (
- Conversão A/D de 24 Bits:
- Módulo ADS1220 integrado via barramento SPI para leitura diferencial.
- Fabricação e montagem simplificada:
- Componentes THT (Through-Hole Technology) para fácil montagem!
📐 Especificações Técnicas (v0.1)
| Parâmetro | Valor Operacional |
|---|---|
Tensão de Alimentação (VCC) | 3,3 V (regulados) |
Massa Virtual (V_BIAS) | 1,65 V |
Resistor de Ganho do TIA (R1) | 1 MΩ |
Capacitor de Estabilidade (C1) | 470 pF ($f_c \approx 338,6\text{ Hz}$) |
Filtro da Linha do DAC (R10 / C7) | 10 kΩ / 100 nF ($f_c \approx 159\text{ Hz}$) |
| Op-Amps Compatíveis (Pinout DIP-8/SOIC-8) | LMC6062, LMC6482, MCP6002 |
📚 Referências
BARD, Allen J.; FAULKNER, Larry R. Electrochemical Methods: Fundamentals and Applications. 3. ed. New York: John Wiley & Sons, 2022.
CAUX, Mélicia et al. PassStat, a simple but fast, precise and versatile open source potentiostat. HardwareX, v. 11, e00290, 2022. DOI: https://doi.org/10.1016/j.ohx.2022.e00290.
DEVELOPMENT and Evaluation of a Mini-Potentiostat for Electrochemical Measurements. IEEE Transactions on Biomedical Circuits and Systems, 2021.
FRANCO, Sergio. Design with Operational Amplifiers and Analog Integrated Circuits. 4. ed. New York: McGraw-Hill Education, 2015.
GOMES, Nathalia Oezau. Desenvolvimento de dispositivos eletroquímicos baseados em papel para monitoramento não invasivo de lactato em suor. 2019. Dissertação (Mestrado em Química Analítica e Inorgânica) – Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, 2019.
KNY, Erich et al. State of the art and future research directions of materials science applied to electrochemical biosensor developments. Analytical and Bioanalytical Chemistry, v. 416, n. 10, p. 2247–2259, 2024. DOI: https://doi.org/10.1007/s00216-023-05054-2.
MOTCHENBACHER, Curtis D.; FITCHEN, Franklin C. Low Noise Electronic Design. New York: John Wiley & Sons, 1973.
PORTABLE Electrochemical DNA Biosensors Using Low-Cost Printed Circuit Boards. Analyst, v. 147, 2022.
ROWE, Aaron A. et al. CheapStat: an open-source, "do-it-yourself" potentiostat for analytical and educational applications. PLoS ONE, v. 6, n. 9, e23783, 2011. DOI: https://doi.org/10.1371/journal.pone.0023783.
SHAMKHALICHENAR, Hamed; BUECHE, Collin J.; CHOI, Jin-Woo. Printed Circuit Board (PCB) Technology for Electrochemical Sensors and Sensing Platforms. Biosensors, v. 10, n. 11, 159, 2020. DOI: https://doi.org/10.3390/bios10110159.
STMICROELECTRONICS. RM0440 Reference Manual: STM32G4 series advanced Arm®-based 32-bit MCUs. Rev. 9. Geneva: STMicroelectronics, 2025.
TSENG, Hsiu-Yang et al. Development of an electrochemical biosensor array for quantitative polymerase chain reaction utilizing three-metal printed circuit board technology. Sensors and Actuators B: Chemical, v. 204, p. 459–466, 2014. DOI: https://doi.org/10.1016/j.snb.2014.07.117.
TURNER, Anthony P. F.; KARUBE, Isao; WILSON, George S. (ed.). Biosensors: Fundamentals and Applications. Oxford: Oxford University Press, 1987.
VEZZA, Vincent et al. Low-cost printed circuit board (PCB) electrochemical biosensors for rapid and label-free detection of Streptococcus pneumoniae. Sensors & Diagnostics, v. 5, p. 1–10, 2026. DOI: https://doi.org/10.1039/d5sd00210a.
XU, Chengtao et al. Electrochemical DNA synthesis and sequencing on a single electrode with scalability for integrated data storage. Science Advances, v. 7, n. 46, eabk0100, 2021. DOI: https://doi.org/10.1126/sciadv.abk0100.
🤖 DESENVOLVIMENTO AUXILIADO POR IA: Este projeto está em desenvolvimento com auxílio de ferramentas de Inteligência Artificial.
Parts
35| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 100nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C3, C5, C9, C11, C12 |
| 4 | 100K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4, R5, R6, R7 |
| 3 | 10uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C4, C6, C10 |
| 2 | Conn_01x08_Pin | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J1, J3 |
| 2 | LMC6482 | Package_DIP:DIP-8_W7.62mm_Socket | U1, U2 |
| 2 | NetTie_2 | NetTie:NetTie-2_SMD_Pad2.0mm | NT1, NT2 |
| 1 | 100pF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C1 |
| 1 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R9 |
| 1 | 1Meg | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3 |
| 1 | 1nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C8 |
| 1 | 1uF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C7 |
| 1 | 220R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2 |
| 1 | 470pF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C2 |
| 1 | 47R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8 |
| 1 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J5 |
| 1 | Conn_01x05 | Connector_PinSocket_2.54mm:PinSocket_1x05_P2.54mm_Vertical | J2 |
| 1 | Conn_01x10_Pin | Connector_PinHeader_2.54mm:PinHeader_1x10_P2.54mm_Vertical | J4 |
| 1 | Jumper_2_Bridged | TestPoint:TestPoint_2Pads_Pitch2.54mm_Drill0.8mm | JP1 |
| 1 | R_Potentiometer_Trim | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV1 |
The 32 most common of 35 parts.
Questions
How big is the OpenXPot PCB?
It measures 100 × 36 mm and has 2 copper layers, 1.6 mm thick.
What parts does the OpenXPot use?
35 parts, built around the LMC6482IN. 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 OpenXPot KiCad files?
From the mcquintao/OpenXPot repository on GitHub, at the commit this page was made from: the board is OpenXPot.kicad_pcb and its schematic OpenXPot.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the OpenXPot design in my own project?
Its repository states no licence, so its author keeps all rights: ask mcquintao before reusing the design.
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