HardLabs

LockLoop

rmingon·LockLoop·hardware/hardware.kicad_pcb

LockLoop PCB layout, top view — open source AVR/Arduino board by rmingon

About the LockLoop PCB

LockLoop is an open source AVR/Arduino PCB design by rmingon, published on GitHub under the CERN-OHL-P-2.0 license. It is a 2-layer board measuring 37 × 49 mm, with 34 components from 26 distinct parts.

Its main chip is the ATmega328PB-A, from the AVR/Arduino family. Other key parts include the DRV8825PWPR, LM1117S-5 and CH340C. By type, the board carries 16 capacitors, 6 resistors, 4 ICs, 4 connectors, 2 diodes and 1 crystal.

It belongs with the robotics & motion and usb & debug tools designs in this gallery.

From the project

Hands-free rotary lock cracker: custom AVR board and stepper-driven rig brute-force every dial combination with blink-and-you’ll-miss-it automation.

- Purpose-built platform that brute-forces 40-position rotary combination locks with a stepper motor. - Firmware (Arduino on AVR) methodically sweeps every triple-number combination and flashes status through an onboard LED. - Custom PCB in KiCad couples an ATmega microcontroller, DRV8825 stepper driver, CH340C USB interface, and power regulation for a self-contained rig.

LockLoop, from the project README
From the project README

Main components on the LockLoop

ATmega328PB-ADRV8825PWPRLM1117S-5CH340C

LockLoop bill of materials (BOM)

34 components, 26 distinct parts.

QtyPartRefs
1
ATmega328PB-A
U1
1
DRV8825PWPR
U2
1
LM1117S-5
U3
1
CH340C
U4
1
Crystal_GND24
Y1
1
Conn_01x02
J2
1
AVR-ISP-6
J3
1
Conn_01x04_Pin
J4
1
USB_C_Plug
P1
1
10k
RV2
2
LED
D1, D2
2
10pf
C1, C2
2
10n
C5, C14
1
0.1u
C6
1
0.47u
C7
1
100n
C8
3
100nF
C9, C17, C18
2
100n
C11, C12
1
1p
C15
2
10nF
C16, C20
Show 6 more
QtyPartRefs
1
10pF
C19
1
1.1K
R1
1
500
R2
1
10K
R3
1
1M
R4
2
0.10
R5, R6

LockLoop design files

The KiCad project lives in the rmingon/LockLoop repository on GitHub; these links point at the commit this page was built from.

LockLoop: common questions

What microcontroller does the LockLoop use?

The LockLoop is built around the ATmega328PB-A, from the AVR/Arduino family.

How big is the LockLoop PCB?

The LockLoop measures 37 × 49 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the LockLoop?

34 components, from 26 distinct parts. The full bill of materials is listed on this page.

Where can I download the LockLoop design files?

From the rmingon/LockLoop repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the LockLoop design in my own project?

Yes, under the terms of its CERN-OHL-P-2.0 license, which rmingon chose for the repository.

Can I test firmware for the LockLoop without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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