2 layers40.6 × 110 mm
Europi surface mount
Allen-Synthesis/EuroPi
EuroPi: A reprogrammable Eurorack module based on the Raspberry Pi Pico
92 parts584CC0-1.0
2 layers155.5 × 75.5 mm
Smart RFID lock
eirode/Smart-RFID-locksimple PCB design for Hack Club Half Life that works as an esp32-c3 controlled RFID lock
- Size
- 155.5 × 75.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 16
- Nets
- 29
- Pads
- 62
- Tracks, vias
- 107, 0
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 9 Oct 2026
- Updated
- 12 Oct 2026
Overview
Smart RFID lock is an open-source printed circuit board by eirode, from the eirode/Smart-RFID-lock repository on GitHub. It is a 2-layer board of 155.5 × 75.5 mm with 16 parts on 29 nets, routed with 107 tracks and 0 vias.
It is built around the L7805. Its parts include 3 diodes, 3 connectors, 2 capacitors, 2 resistors and 2 ICs. It belongs with the radio and wireless boards and the ESP32 and RISC-V boards of this library.
Main components
1README
README.mdSmart-RFID-lock
simple PCB design for Hack Club Half Life that works as an esp32-c3 controlled RFID lock
Firmware wiring
The firmware uses the MFRC522 reader over SPI:
| RC522 signal | ESP32-C3 GPIO |
|---|---|
| SCK | 8 |
| MISO | 9 |
| MOSI | 10 |
| SDA/SS | 6 |
| RST | 7 |
| 3.3V | 3.3V |
| GND | GND |
The RC522 should remain configured for SPI. The SDA pin on an RC522 SPI
module is the SPI chip-select signal, not an I²C data connection.
Before uploading, replace AUTHORIZED_UID in
Smart-lock firmware/src/main.cpp with
the UID of the card that should unlock the relay. The relay is energized for
five seconds after an authorized card is detected.
Parts
16| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | LED | LED_THT:LED_D1.8mm_W3.3mm_H2.4mm | D1, D2 |
| 1 | 0.1μF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C2 |
| 1 | 0.33μF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C1 |
| 1 | 12V alim connexion | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | J2 |
| 1 | 1K | Resistor_THT:R_Axial_Power_L20.0mm_W6.4mm_P7.62mm_Vertical | R2 |
| 1 | 68 | Resistor_THT:R_Axial_Power_L20.0mm_W6.4mm_P7.62mm_Vertical | R1 |
| 1 | Buzzer | Buzzer_Beeper:Buzzer_12x9.5RM7.6 | BZ1 |
| 1 | D | Diode_THT:D_DO-15_P15.24mm_Horizontal | D3 |
| 1 | L7805 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | U2 |
| 1 | Lock 12V output | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | J3 |
| 1 | NPN | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | Q1 |
| 1 | RFID connector | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J1 |
| 1 | SANYOU_SRD_Form_B | Relay_THT:Relay_SPST_SANYOU_SRD_Series_Form_B | K1 |
| 1 | SW_Push | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | SW1 |
| 1 | XIAO-ESP32-C3-SMD | Imported Parts:XIAO-ESP32-C3-SMD | U1 |
Questions
How big is the Smart RFID lock PCB?
It measures 155.5 × 75.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Smart RFID lock use?
16 parts, built around the L7805. 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 Smart RFID lock KiCad files?
From the eirode/Smart-RFID-lock repository on GitHub, at the commit this page was made from: the board is PCB/PCB.kicad_pcb and its schematic PCB/PCB.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Smart RFID lock design in my own project?
Its repository states no licence, so its author keeps all rights: ask eirode before reusing the design.
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