2 layers60 × 40.5 mm
Environmental Monitoring Node
kothanikhil9/Environmental-Monitoring-Node
The system continuously measures environmental temperature using a digital sensor and processes the data through a microcontroller.
35 parts
2 layers127.5 × 122.9 mm
Lockbox
yummCat/lockboxThe latest brilliant innovation we were able to come up with, was a box, that locks! 🤯
- Size
- 127.5 × 122.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 41
- Nets
- 48
- Pads
- 188
- Tracks, vias
- 436, 18
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 6 Jun 2025
- Updated
- 29 Jul 2025
Overview
Lockbox is an open-source printed circuit board by yummCat, from the yummCat/lockbox repository on GitHub. It is a 2-layer board of 127.5 × 122.9 mm with 41 parts on 48 nets, routed with 436 tracks and 18 vias.
It is built around the MT3608, AMS1117-3.3 and AT24CS16-MAHM-E, with the TP4056-42-ESOP8 and SS14 among its other parts. Its parts include 10 switches, 9 resistors, 7 capacitors, 4 ICs and 4 diodes. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
5
MT3608
SOT-23-6-40℃~+85℃ 1 1.2MHz 100uA、1.6mA 2A 2V~24V Adjustable Boost Boost Built-in No SOT-23-6 DC-DC Converters ROHS西安航天民芯DC-DC Converters
AMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
AT24CS16-MAHM-E
UDFN-8-EP(2x3)-40℃~+85℃ 1,000,000 cycles 1.7V~5.5V 16Kbit 1MHz 5ms Hardware write protection function、Noise suppression function、Built-in power-on reset (POR) I2C UDFN-8-EP(2x3) EEPROM ROHSMicrochip TechnologyEEPROM
TP4056-42-ESOP8
ESOP-8-40℃~+85℃ 1 1A 2uA 4.2V 4V~8V Charging IC Lithium Battery Support ESOP-8 Battery Management ROHSTOPPOWERBattery Management
SS14
SMA(DO-214AC)-55℃~+150℃ 1A 25A 300uA@40V 40V 550mV@1A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
README
README.mdlockbox
The latest brilliant innovation we were able to come up with, was a box, that locks! 🤯
This device was meant to be small and cute, and importantly baby friendly. Designed for baby professionals, colloquially known as "Boss Babies" this device is meant to be carried around in a briefcase, unlocked with an RFID badge and four digit pin. In the process we learned a lot about RFID and how encryption worked(when we got sidetracked).
This project started with a schematic:
Next we made the pcb design:
Next we made the 3d model:
Lastly the BOM:
Parts
41| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | SW_Push | Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9 |
| 3 | 10mF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C3, CAMSIN1, CAMSOUT1 |
| 2 | 0.1mF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C2, CAMSOUT2 |
| 2 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3, R9 |
| 2 | 22mF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C1, C4 |
| 2 | 4.7k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5, R7 |
| 2 | SS14 | Diode_SMD:D_SMA | D3, D4 |
| 1 | 100 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8 |
| 1 | 100k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 10mH | Inductor_THT:L_Axial_L26.0mm_D9.0mm_P5.08mm_Vertical_Fastron_77A | L1 |
| 1 | 1N5819 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D2 |
| 1 | 20k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 220 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6 |
| 1 | 22mH | Inductor_THT:L_Axial_L26.0mm_D9.0mm_P5.08mm_Vertical_Fastron_77A | L2 |
| 1 | 2N7000 | Package_TO_SOT_THT:TO-92L_Inline_Wide | Q2 |
| 1 | 2k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U3 |
| 1 | AT24CS16-MAHM | Package_DFN_QFN:DFN-8-1EP_3x2mm_P0.5mm_EP1.3x1.5mm | U2 |
| 1 | Arduino_Nano_v3.x | Module:Arduino_Nano | A1 |
| 1 | Battery_Cell | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | BT1 |
| 1 | LED | LED_THT:LED_D5.0mm | D1 |
| 1 | MT3608 | Package_TO_SOT_SMD:SOT-23-6 | U4 |
| 1 | RFID-RC522-MODULE | micustom2:RC522_I2C_B30x20mm | P1 |
| 1 | SSD1306 | micustom2:Adafruit_SSD1306 | Brd1 |
| 1 | SW_RST | Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB | SW10 |
| 1 | TP4056-42-ESOP8 | Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm_ThermalVias | U1 |
Questions
How big is the Lockbox PCB?
It measures 127.5 × 122.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Lockbox use?
41 parts, built around the MT3608, AMS1117-3.3, AT24CS16-MAHM-E and TP4056-42-ESOP8. 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 Lockbox KiCad files?
From the yummCat/lockbox repository on GitHub, at the commit this page was made from: the board is pcb/lockbox.kicad_pcb and its schematic pcb/lockbox.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Lockbox design in my own project?
Its repository states no licence, so its author keeps all rights: ask yummCat before reusing the design.
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