2 layers70 × 70 mm
2 layers98 × 45 mm
Lockbox2
AlexaWitkin/RFID_LockBoxATMega + RFID + Servo LockBox
- Size
- 98 × 45 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 23
- Nets
- 35
- Pads
- 103
- Tracks, vias
- 189, 24
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 1 Dec 2025
- Updated
- 12 Dec 2025
Overview
Lockbox2 is an open-source printed circuit board by AlexaWitkin, from the AlexaWitkin/RFID_LockBox repository on GitHub. It is a 2-layer board of 98 × 45 mm with 23 parts on 35 nets, routed with 189 tracks and 24 vias.
It is built around the ATMEGA328P-PU, CD40109BE and LTST-C150EKT, with the SD1206S040S2R0 among its other parts. Its parts include 9 capacitors, 4 ICs, 4 connectors, 2 resistors and 2 diodes. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
4
ATMEGA328P-PU
DIP-28-300mil-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 2KB 32KB 8 Bit AVR Built-in FLASH DIP-28-300mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
CD40109BE
PDIP-16-55℃~+125℃ 1 3V~18V 3V~18V 4 Tri-State Unidirectional PDIP-16 Translators, Level Shifters ROHSTexas InstrumentsTranslators, Level Shifters
LTST-C150EKT
1206-55℃~+85℃ 100mW 10mA 130° 2V 621nm 630nm 6mcd Discrete Diode Red-orange Water Clear 1206 LED Indication - Discrete ROHSLite-OnLED Indication - DiscreteSD1206S040S2R0
1206200uA@40V 40V 500mV@2A 1206 Schottky Diodes ROHSKyocera AVXSchottky Diodes
README
README.mdRFID_LockBox
Abstract
This project presents the design and implementation of a compact RFID-controlled lockbox intended to provide secure personal storage for an end user sharing a living space with a roommate. The goal was to create a reliable, stand-alone access-control system while gaining hands-on experience working with the ATmega328P as a discrete microcontroller rather than relying on a full Arduino development board. The system integrates an RC522 RFID reader operating at 13.56 MHz, a custom-designed PCB incorporating power regulation, logic-level shifting, and microcontroller support circuitry, and a servo-based mechanical locking mechanism housed within a laser-cut wooden enclosure. Throughout development, particular attention was given to power constraints, signal-integrity challenges between 5V and 3.3V domains, and practical issues such as servo initialization and UID formatting. The final design successfully demonstrates a functional, durable lockbox that reliably authenticates RFID tags and actuates a locking mechanism, achieving the project’s objectives in both usability and technical learning.
** For more information view 'CMPE 3185 Final Project.pdf'
Parts
23| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 0.1 uF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1, C4 |
| 2 | 10 uF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C2, C3 |
| 2 | 22 pF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C7, C8 |
| 2 | 22 uF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C5, C6 |
| 1 | 10 uF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C9 |
| 1 | 10k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R2 |
| 1 | 16 MHz Crystal | Crystal:Crystal_HC49-U_Vertical | Y1 |
| 1 | 1k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1 |
| 1 | 61300821121 | SamacSys_Parts:61300821121 | J1 |
| 1 | ATmega328P-P | Package_DIP:DIP-28_W7.62mm | U3 |
| 1 | AZ1117CH2-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U2 |
| 1 | AZ1117CH2-5.0 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U1 |
| 1 | BATT_TERM | TerminalBlock_Phoenix:TerminalBlock_Phoenix_PT-1,5-2-5.0-H_1x02_P5.00mm_Horizontal | J2 |
| 1 | CD40109BE | SamacSys_Parts:DIP794W53P254L1930H508Q16N | U4 |
| 1 | LTST-C150EKT | LED_SMD:LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D1 |
| 1 | RFID_TERM | TerminalBlock_Phoenix:TerminalBlock_Phoenix_PT-1,5-6-5.0-H_1x06_P5.00mm_Horizontal | J4 |
| 1 | SD1206S040S2R0 | Diode_SMD:D_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D2 |
| 1 | SERVO_TERM | TerminalBlock_Phoenix:TerminalBlock_Phoenix_PT-1,5-3-5.0-H_1x03_P5.00mm_Horizontal | J3 |
| 1 | TS04-66-50-BK-260-SMT-TR | SamacSys_Parts:TS046650BK260SMTTR | S1 |
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Questions
How big is the Lockbox2 PCB?
It measures 98 × 45 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Lockbox2 use?
23 parts, built around the ATMEGA328P-PU, CD40109BE, LTST-C150EKT and SD1206S040S2R0. 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 Lockbox2 KiCad files?
From the AlexaWitkin/RFID_LockBox repository on GitHub, at the commit this page was made from: the board is PCB_Files/lockbox2.kicad_pcb and its schematic PCB_Files/lockbox2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Lockbox2 design in my own project?
Its repository states no licence, so its author keeps all rights: ask AlexaWitkin before reusing the design.