HardLabs

Speedometer hardware

gpgreen·speedometer_hardware

Speedometer hardware PCB layout, top view — open source AVR/Arduino board by gpgreen

About the Speedometer hardware PCB

Speedometer hardware is an open source AVR/Arduino PCB design by gpgreen, published on GitHub. It is a 4-layer board measuring 70 × 34 mm, with 51 components from 28 distinct parts.

Its main chip is the ATMEGA644-20AU, from the AVR/Arduino family. Other key parts include the US1881, LT1762-3.3, 4N25 and LT1762-5. By type, the board carries 21 capacitors, 13 resistors, 5 ICs, 5 diodes, 3 connectors and 1 transistor.

From the project

KiCAD project for digital speedometer project

Main components on the Speedometer hardware

US1881LT1762-3.34N25LT1762-5ATMEGA644-20AU

Speedometer hardware bill of materials (BOM)

51 components, 28 distinct parts.

QtyPartRefs
1
US1881
U1
1
LT1762-3.3
U2
1
4N25
U3
1
LT1762-5
U4
1
ATMEGA644-20AU
U5
1
BSS138
Q1
1
16MHz 18pF
Y1
1
Conn_01x08
J1
1
Conn_01x10
J2
1
Prog Header
J3
1
SW_Push
SW1
4
D
D1, D2, D4, D5
1
D_Schottky
D3
1
10uH
L1
6
100nF
C1, C15, C16, C17, C18, C20
1
4.7nF
C2
2
1uF
C3, C4
1
1nF
C5
4
10nF
C6, C11, C14, C23
2
10nF
C7, C9
Show 8 more
QtyPartRefs
3
10uF
C8, C10, C19
2
20pF
C12, C13
1
390
R1
7
10K
R2, R3, R5, R7, R8, R9, R12
1
4.7K
R4
1
100K
R6
2
1K
R10, R11
1
18K
R13

Speedometer hardware design files

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

Speedometer hardware: common questions

What microcontroller does the Speedometer hardware use?

The Speedometer hardware is built around the ATMEGA644-20AU, from the AVR/Arduino family.

How big is the Speedometer hardware PCB?

The Speedometer hardware measures 70 × 34 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Speedometer hardware?

51 components, from 28 distinct parts. The full bill of materials is listed on this page.

Where can I download the Speedometer hardware design files?

From the gpgreen/speedometer_hardware repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Speedometer hardware design in my own project?

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

Can I test firmware for the Speedometer hardware 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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