HardLabs

Lr 40

Dade3e·laser_rifle·Kicad/lr_40/lr_40.kicad_pcb

Lr 40 PCB layout, top view — open source AVR/Arduino board by Dade3e

About the Lr 40 PCB

Lr 40 is an open source AVR/Arduino PCB design by Dade3e, published on GitHub. It is a 2-layer board measuring 39 × 19 mm, with 27 components from 21 distinct parts.

Its main chip is the ATtiny85V-10P, from the AVR/Arduino family. Other key parts include the MCP1700x-300xxTT and BQ21040. By type, the board carries 8 resistors, 6 capacitors, 3 ICs, 3 switches, 3 diodes and 2 connectors.

Main components on the Lr 40

MCP1700x-300xxTTATtiny85V-10PBQ21040

Lr 40 bill of materials (BOM)

27 components, 21 distinct parts.

QtyPartRefs
1
MCP1700x-300xxTT
U1
1
ATtiny85V-10P
U2
1
BQ21040
U3
1
MMBT3904
Q1
1
Screw_Terminal_01x02
J1
1
USB_C_Receptacle_PowerOnly_6P
J3
1
Battery_Cell
BT2
1
SW_DIP_x01
SW1
1
SW_DIP_x01
SW2
1
SW_DIP_x01
SW3
1
LED
D1
2
LED
D2, D3
4
1uF
C1, C2, C6, C7
1
10uF
C3
1
0.1uF
C4
1
330R
R1
2
10k
R2, R6
1
220R
R3
2
5K1
R4, R5
1
1k5
R7
Show 1 more
QtyPartRefs
1
1k
R8

Lr 40 design files

The KiCad project lives in the Dade3e/laser_rifle repository on GitHub; these links point at the commit this page was built from.

Lr 40: common questions

What microcontroller does the Lr 40 use?

The Lr 40 is built around the ATtiny85V-10P, from the AVR/Arduino family.

How big is the Lr 40 PCB?

The Lr 40 measures 39 × 19 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Lr 40?

27 components, from 21 distinct parts. The full bill of materials is listed on this page.

Where can I download the Lr 40 design files?

From the Dade3e/laser_rifle repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Lr 40 design in my own project?

The repository has no license, so all rights stay with Dade3e. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Lr 40 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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