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Hourglass reva

geschmit·hourglass·hourglass_reva/hourglass_reva.kicad_pcb

Hourglass reva PCB layout, top view — open source AVR/Arduino board by geschmit

About the Hourglass reva PCB

Hourglass reva is an open source AVR/Arduino PCB design by geschmit, published on GitHub under the Apache-2.0 license. It is a 4-layer board measuring 34 × 45.9 mm, with 93 components from 23 distinct parts.

Its main chip is the ATmega32U4-M, from the AVR/Arduino family. Other key parts include the IS31FL3731-QF, LSM9DS1, DS3231MZ and RT9080-33GJ5. By type, the board carries 65 diodes, 9 resistors, 6 capacitors, 5 ICs, 4 connectors and 2 switches.

From the project

Hack Club Onboard submission project

Hourglass reva, from the project README
From the project README

Main components on the Hourglass reva

ATmega32U4-MIS31FL3731-QFLSM9DS1DS3231MZRT9080-33GJ5

Hourglass reva bill of materials (BOM)

93 components, 23 distinct parts.

QtyPartRefs
1
ATmega32U4-M
U1
1
IS31FL3731-QF
U2
1
LSM9DS1
U3
1
DS3231MZ
U4
1
RT9080-33GJ5
U5
1
DMG3414U
Q1
1
8MHz
Y1
1
Conn_RESET
J1
1
Conn_BATT
J2
1
AVR-ISP-6
J3
1
USB_C_Receptacle_USB2.0_14P
J4
1
SW_User1
SW1
1
SW_User2
SW2
12
LED
D1, D6, D11, D16, D21, D26, D31, D36 +4
52
LED
D2, D3, D4, D5, D7, D8, D9, D10 +44
1
MBR0540
D65
2
0.1uF
C1, C3
3
10uF
C2, C4, C6
1
0.22uF
C5
2
5.1k
R1, R3
Show 3 more
QtyPartRefs
2
22
R2, R7
3
10k
R4, R8, R9
2
20k
R5, R6

Hourglass reva design files

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

Hourglass reva: common questions

What microcontroller does the Hourglass reva use?

The Hourglass reva is built around the ATmega32U4-M, from the AVR/Arduino family.

How big is the Hourglass reva PCB?

The Hourglass reva measures 34 × 45.9 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Hourglass reva?

93 components, from 23 distinct parts. The full bill of materials is listed on this page.

Where can I download the Hourglass reva design files?

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

Can I use the Hourglass reva design in my own project?

Yes, under the terms of its Apache-2.0 license, which geschmit chose for the repository.

Can I test firmware for the Hourglass reva 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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