HardLabs

Mainboard

LOEWE-emergenCITY·freespeaker·electric_design/FreeSpeaker/Mainboard/Mainboard.kicad_pcb

Mainboard PCB layout, top view — open source AVR/Arduino board by LOEWE-emergenCITY

About the Mainboard PCB

Mainboard is an open source AVR/Arduino PCB design by LOEWE-emergenCITY, published on GitHub. It is a 2-layer board measuring 100 × 100 mm, with 36 components from 24 distinct parts.

Its main chip is the ATmega32-16A, from the AVR/Arduino family. Other key parts include the 74LVC1G125, ARJM11D7502AB, slice_connector_male and PCF85063AT/AAZ. By type, the board carries 11 resistors, 6 ICs, 6 capacitors, 5 connectors, 4 diodes and 1 crystal.

It belongs with the iot & wireless designs in this gallery.

From the project

The modular, research-friendly smart home hub

For developing we used KiCAD which is an open source CAD software. It was used by the Raspberry Pi Foundation for their IO Board and the Compute Module.

ONLY store files we already build. First step will only have project and schematics!

Each subdir is a stand alone KiCAD project.

The top level project is - for referencing the different schematics - showing the dependencies between the different PCBs - documentation - generating a full bill of material

Main components on the Mainboard

74LVC1G125ARJM11D7502ABATmega32-16Aslice_connector_malePCF85063AT/AAZ

Mainboard bill of materials (BOM)

36 components, 24 distinct parts.

QtyPartRefs
2
74LVC1G125
U1, U2
1
ARJM11D7502AB
U3
1
ATmega32-16A
U4
1
slice_connector_male
U5
1
PCF85063AT/AAZ
U6
1
Q13FC1350000400
Y1
1
Debug Uart F232RL USB to TTL
J1
1
AVR-JTAG-10
J2
1
Conn_02x04_Odd_Even
J4
1
USB_OTG
J5
1
Conn_01x02_Male
J6
1
Battery_Cell
BT1
1
ComputeModule4-CM4
Module1
2
LED Green
D1, D2
1
BAT54C,215
D3
1
LED Red
D4
1
10m
L1
4
100n
C1, C4, C5, C6
1
10n
C2
1
100n
C3
Show 4 more
QtyPartRefs
3
120
R1, R4, R11
2
470R
R2, R3
4
2K2
R5, R6, R7, R8
2
510K 1%
R9, R10

Mainboard design files

The KiCad project lives in the LOEWE-emergenCITY/freespeaker repository on GitHub; these links point at the commit this page was built from.

Mainboard: common questions

What microcontroller does the Mainboard use?

The Mainboard is built around the ATmega32-16A, from the AVR/Arduino family.

How big is the Mainboard PCB?

The Mainboard measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Mainboard?

36 components, from 24 distinct parts. The full bill of materials is listed on this page.

Where can I download the Mainboard design files?

From the LOEWE-emergenCITY/freespeaker repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Mainboard design in my own project?

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

Can I test firmware for the Mainboard 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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