HardLabs

Harma

TDHolmes·Harma·Pensel/board/Pensel.kicad_pcb

Harma PCB layout, top view — open source STM32 board by TDHolmes

About the Harma PCB

Harma is an open source STM32 PCB design by TDHolmes, published on GitHub under the Unlicense license. It is a 4-layer board measuring 60 × 13 mm, with 43 components from 23 distinct parts.

Its main chip is the STM32F302x6/8, from the STM32 family. Other key parts include the LSM9DS1, NCP114 and NCP508. By type, the board carries 16 capacitors, 11 resistors, 4 ICs, 3 connectors, 3 switches and 2 diodes.

It belongs with the sensors designs in this gallery.

From the project

A project to assist over-caffeinated electrical engineers in soldering.

Pensel, or brush/pencil in Swedish, is the device the user interfaces with to control the robotic arms. It is this sub-component that I will first tackle to make the whole system. The design as it stands is as follows:

There will be one unified design to control the iron, solder, and/or wire/components. As such, there must be a generic control methodology built into the Pensel. The Pensel will have as follows:

Main components on the Harma

STM32F302x6/8LSM9DS1NCP114NCP508

Harma bill of materials (BOM)

43 components, 23 distinct parts.

QtyPartRefs
1
STM32F302x6/8
U1
1
LSM9DS1
U2
1
NCP114
U3
1
NCP508
U4
1
24 MHz
Y1
1
JTAG
J3
1
COMS
J4
1
USB_PROC
P1
2
0.1 uF
C_NOSTUFF1, C_NOSTUFF2
1
Jumper
JP1
1
TACT_4.2MM
SW1
1
MAIN
SW2
1
AUX
SW3
1
LED0
D2
1
LED1
D3
1
10 uF
C1
6
0.1 uF
C2, C4, C6, C7, C12, C13
1
10 nF
C3
1
4.7 uF
C5
5
1 uF
C8, C9, C10, C11, C14
Show 3 more
QtyPartRefs
2
8 pF
C15, C16
9
4K7
R1, R2, R3, R4, R8, R9, R10, R11 +1
2
330R
R5, R6

Harma design files

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

Harma: common questions

What microcontroller does the Harma use?

The Harma is built around the STM32F302x6/8, from the STM32 family.

How big is the Harma PCB?

The Harma measures 60 × 13 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Harma?

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

Where can I download the Harma design files?

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

Can I use the Harma design in my own project?

Yes, under the terms of its Unlicense license, which TDHolmes chose for the repository.

Can I test firmware for the Harma 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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