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Ligra back

Jana-Marie·ligra·ligra_back/ligra_back.kicad_pcb

Ligra back PCB layout, top view — open source STM32 board by Jana-Marie
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About the Ligra back PCB

Ligra back is an open source STM32 PCB design by Jana-Marie, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 106.7 × 106.7 mm, with 55 components from 28 distinct parts.

Its main chip is the STM32F030F4Px, from the STM32 family. Other key parts include the AL8843, NCP1117-12_SOT223, NCP1117-3.3_SOT223 and DRV8231. By type, the board carries 18 capacitors, 12 resistors, 9 connectors, 5 ICs, 3 transistors and 3 diodes.

From the project

an open source image projector build from scratch and based off of flea market parts.

This board serves as power-input and LED controller for a 0-3A 0-5V LED. It currently is v1.0.0 and has an additional DC-motor speed controller onboard, you can safely ignore it. I plan to build a different version for myself, that is a bit more advanced, feel free to then also use it. Generally this board is fully optional, but may prove to be very useful.

[Todo, add BOM and assembly instructions here]

Ligra back, from the project README
From the project README

Main components on the Ligra back

AL8843NCP1117-12_SOT223NCP1117-3.3_SOT223STM32F030F4PxDRV8231

Ligra back bill of materials (BOM)

55 components, 28 distinct parts.

QtyPartRefs
1
AL8843
U2
1
NCP1117-12_SOT223
U4
1
NCP1117-3.3_SOT223
U5
1
STM32F030F4Px
U7
1
DRV8231
U8
2
BC807
Q1, Q3
1
AO3401A
Q2
1
POWER
J5
1
POWER
J6
1
LED
J7
1
FAN
J8
1
Motor
J9
1
USB-vertical_footprint
J10
1
USB_C_Receptacle_PowerOnly_6P
J11
1
XT60
J12
1
TC2030-CTX-Tag-Connect
P1
1
jmp
JP1
2
10k
RV1, RV2
1
SW_SP3T
SW2
2
D210
D1, D2
Show 8 more
QtyPartRefs
1
LED
D5
1
47uF
L2
9
100n
C1, C3, C4, C10, C11, C12, C16, C17 +1
7
4u7
C2, C5, C6, C8, C9, C13, C14
2
100u
C7, C15
2
R33
R1, R9
9
5k1
R2, R3, R4, R5, R6, R7, R8, R12 +1
1
LDR
R10

Ligra back design files

The KiCad project lives in the Jana-Marie/ligra repository on GitHub; these links point at the commit this page was built from.

Ligra back: common questions

What microcontroller does the Ligra back use?

The Ligra back is built around the STM32F030F4Px, from the STM32 family.

How big is the Ligra back PCB?

The Ligra back measures 106.7 × 106.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Ligra back?

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

Where can I download the Ligra back design files?

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

Can I use the Ligra back design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which Jana-Marie chose for the repository.

Can I test firmware for the Ligra back without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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