# Arduino Nano R4 Wiegand Inline Carrier ## Description 2-layer Arduino Nano R4 inline Wiegand carrier board with reader and panel screw terminals, Brivo-compatible data remapping, and 12V pass-through to VIN. ## Project Details - **Owner:** thomas - **Created:** 3/18/2026 - **Last Updated:** 4/22/2026 - **Visibility:** Public - **Connector J2 Pin Labels:** Panel D0, Panel D1, GND, +12V - **Intentional Signal Swap:** Brivo compatibility: Panel D0 -> Arduino D5, Panel D1 -> Arduino D4 - **Connector J3 Pin Labels:** Reader D0, Reader D1, GND, +12V - **JP1 Annotation:** PWR SEL: 1-2 = REG 5V, 2-3 = USB/VUSB - **System Architecture:** ```mermaid flowchart TD Reader["READER Terminal J2"] --> Protect["Input Protection and Pullups"] Protect --> Nano["Arduino Nano R4 U1"] Nano --> Panel["PANEL Terminal J3"] Input12V["12V Input"] --> Diode["Reverse Polarity Diode D1"] Diode --> Reg["AMS1117 5V Regulator U2"] Reg --> PowerSel["JP1 PWR SEL"] PowerSel --> Nano Reg --> PwrLed["Power LED1"] Nano --> ActLed["Activity LED2"] ``` ## Key Components ### D1 — [1N4007G](https://www.flux.ai/lcsc/1n4007g~gy65.md) - JLCPCB Part Class: Extended Part - Diode Type: Rectifier Diode - Role Details: Series diode from +12V_IN terminal to protected input rail - Manufacturer Part Number: 1N4007G - Role: Reverse Protection - Reverse Voltage: 1000V - Package: SMA - Product Info Url: https://lcsc.com/product-detail/Diodes-General-Purpose_1N4007G-M7_C111122.html - Package or Case Code: SMA_L4.4-W2.6-LS5.0-RD - Part Type: Diodes - General Purpose - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1811131720_Shikues-1N4007G_C111122.pdf - Manufacturer Name: SHIKUES(时科) - LCSC Part Number: C111122 - Forward Voltage: 1.1V **Pins:** - A [pin 2] - C [pin 1] ### D13 — [SMBJ5.0A](https://www.flux.ai/adrian95/smbj5p0a~lvt.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: SMBJ5.0A - Datasheet URL: https://www.littelfuse.com/~/media/electronics/datasheets/tvs_diodes/littelfuse_tvs_diode_smbj_datasheet.pdf.pdf - Role: ESD Protection - Package: SMB - Manufacturer Name: Littelfuse Inc. - Part Type: Diode - Role Details: TVS from READER_D0 to GND **Pins:** - A [pin 2] - K [pin 1] ### D14 — [SMBJ5.0A](https://www.flux.ai/adrian95/smbj5p0a~lvt.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: SMBJ5.0A - Datasheet URL: https://www.littelfuse.com/~/media/electronics/datasheets/tvs_diodes/littelfuse_tvs_diode_smbj_datasheet.pdf.pdf - Role: ESD Protection - Package: SMB - Manufacturer Name: Littelfuse Inc. - Part Type: Diode - Role Details: TVS from READER_D0 to GND **Pins:** - A [pin 2] - K [pin 1] ### J1 — [282837-4](https://www.flux.ai/adrian95/282837-4~o7p.md) - Manufacturer Name: TE Connectivity AMP Connectors - Part Type: Connector - Connector Positions: 4 - Package: Through Hole - Role: Field Connector - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.te.com/usa-en/product-282837-4.datasheet.pdf - Connector Type: Screw Terminal - Manufacturer Part Number: 282837-4 - Connector Pitch: 5.08mm - Role Details: PANEL terminal, left-to-right D0 D1 GND +12V; Brivo-compatible output connector **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### J4 — [282837-4](https://www.flux.ai/adrian95/282837-4~o7p.md) - Manufacturer Part Number: 282837-4 - Connector Type: Screw Terminal - Connector Pitch: 5.08mm - Role Details: READER terminal, left-to-right D0 D1 GND +12V; Wiegand reader input connector - Datasheet URL: https://www.te.com/usa-en/product-282837-4.datasheet.pdf - Package: Through Hole - Role: Field Connector - Connector Positions: 4 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Manufacturer Name: TE Connectivity AMP Connectors **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### LED1 - Y — [APT2012YC](https://www.flux.ai/adrian95/apt2012yc~a7l.md) - Datasheet URL: https://www.kingbrightusa.com/images/catalog/SPEC/APT2012YC.pdf - Manufacturer Part Number: APT2012YC - Manufacturer Name: Kingbright - Role: Indicator - Forward Voltage: 2.1V - Package: 0805 - Role Details: Activity LED on Arduino D13, yellow, 0805 - Part Type: LED - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 2] - K [pin 1] ### U1 — [AMS1117-5.0](https://www.flux.ai/vasy_skral/ams1117-50~zsf.md) - Role: Regulator - Package: SOT-223 - Manufacturer Name: AMS - Role Details: 12V input to 5V rail linear regulator - Manufacturer Part Number: AMS1117-5.0 - Part Type: Integrated Circuit - Datasheet URL: https://datasheet.lcsc.com/lcsc/1810231832_Advanced-Monolithic-Systems-AMS1117-5-0_C6187.pdf **Pins:** - GND [pin 1] - TAB(VOUT) [pin 4] - VIN [pin 3] - VOUT [pin 2] ### U3 — [ARDUINO_NANO](https://www.flux.ai/jecstronic/arduinonano~2x.md) - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Texas Instruments Inc. - Role Details: Arduino Nano footprint controller for Wiegand proxy board - Datasheet URL: https://www.snapeda.com/parts/Arduino%20Nano/Arduino/datasheet/ - Package: Module - Role: Controller - Manufacturer Part Number: ARDUINO_NANO **Pins:** - +5V [pin 27] - 3V3 [pin 17] - A0 [pin 19] - A1 [pin 20] - A2 [pin 21] - A3 [pin 22] - A4 [pin 23] - A5 [pin 24] - A6 [pin 25] - A7 [pin 26] - AREF [pin 18] - COM/GND [pin 4] - COM/GND [pin 29] - D0/RX [pin 2] - D1/TX [pin 1] - D10 [pin 13] - D11/MOSI [pin 14] - D12/MISO [pin 15] - D13/SCK [pin 16] - D2 [pin 5] - D3 [pin 6] - D4 [pin 7] - D5 [pin 8] - D6 [pin 9] - D7 [pin 10] - D8 [pin 11] - D9 [pin 12] - RESET [pin 3] - RESET [pin 28] - VIN [pin 30] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/thomas/arduino-nano-r4-wiegand-inline-carrier~9j](https://www.flux.ai/thomas/arduino-nano-r4-wiegand-inline-carrier~9j).* --- *Generated from [https://www.flux.ai/thomas/arduino-nano-r4-wiegand-inline-carrier~9j](https://www.flux.ai/thomas/arduino-nano-r4-wiegand-inline-carrier~9j)*