HardLabs

Heart

lime7git·heart·heart-hardware/pcb/heart/heart.kicad_pcb

Heart PCB layout, top view — open source STM32 board by lime7git

About the Heart PCB

Heart is an open source STM32 PCB design by lime7git, published on GitHub. It is a 4-layer board measuring 47.6 × 45.2 mm, with 56 components from 14 distinct parts.

Its main chip is the STM32L031F6Px, from the STM32 family. Other key parts include the TCA6416APWR, LIS3DH and Holtek-Semicon-BS812A-1. By type, the board carries 22 resistors, 16 diodes, 12 capacitors, 4 ICs and 1 switch.

It belongs with the sensors designs in this gallery.

From the project

A small gift. Heart shape PCB with STM32L0 microcontroller, gpio expander, accelerometer and some fancy leds.

It can be used as a keychain. It is operates on a CR2450 coin cell battery. There is a few led patterns which can be start by press a touch button or shake. When the device does not recognize any event in 10 seconds it will enter the low power mode and can be woke up only by touching button. In this mode the power consumption is about 25 uA.

[](https://youtu.be/TwGDAYFjpBY "Heart")

Heart, from the project README
From the project README

Main components on the Heart

STM32L031F6PxTCA6416APWRLIS3DHHoltek-Semicon-BS812A-1

Heart bill of materials (BOM)

56 components, 14 distinct parts.

QtyPartRefs
1
STM32L031F6Px
U1
1
TCA6416APWR
U2
1
LIS3DH
U3
1
Holtek-Semicon-BS812A-1
U4
1
CR2450
CR2450
1
SW_SPDT
SW1
16
LED
D0, D1, D2, D3, D4, D5, D6, D7 +8
1
47uF
C0
6
100nF
C1, C2, C4, C6, C9, C11
3
10nF
C3, C5, C7
1
10uF
C8
1
25pF
C10
16
R
R0, R1, R2, R3, R4, R5, R6, R7 +8
6
10k
R21, R22, R23, R24, R25, R26

Heart design files

The KiCad project lives in the lime7git/heart repository on GitHub; these links point at the commit this page was built from.

Heart: common questions

What microcontroller does the Heart use?

The Heart is built around the STM32L031F6Px, from the STM32 family.

How big is the Heart PCB?

The Heart measures 47.6 × 45.2 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Heart?

56 components, from 14 distinct parts. The full bill of materials is listed on this page.

Where can I download the Heart design files?

From the lime7git/heart repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Heart design in my own project?

The repository has no license, so all rights stay with lime7git. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Heart 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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