HardLabs

NeedleDCF77

Dzalex·NeedleDCF77·hardware/NeedleDCF77/NeedleDCF77.kicad_pcb

NeedleDCF77 PCB layout, top view — open source STM32 board by Dzalex

About the NeedleDCF77 PCB

NeedleDCF77 is an open source STM32 PCB design by Dzalex, published on GitHub. It is a 2-layer board measuring 130 × 30 mm, with 85 components from 54 distinct parts.

Its main chip is the STM32L051C8Tx, from the STM32 family. Other key parts include the LTC3558, MAS6180_77kHz, LT1617, PT6312 and LM4871. By type, the board carries 30 resistors, 24 capacitors, 7 connectors, 6 ICs, 4 diodes and 4 inductors.

It belongs with the displays & leds and power & battery designs in this gallery.

From the project

Using needle meter and DCF77 receiver to show current time.

Schematic and PCB are designed in KiCad — see hardware/NeedleDCF77, including a rendered schematic PDF.

The project can also be opened directly in STM32CubeIDE.

Main components on the NeedleDCF77

LTC3558STM32L051C8TxMAS6180_77kHzLT1617PT6312LM4871

NeedleDCF77 bill of materials (BOM)

85 components, 54 distinct parts.

QtyPartRefs
1
LTC3558
U1
1
STM32L051C8Tx
U2
1
MAS6180_77kHz
U3
1
LT1617
U4
1
PT6312
U5
1
LM4871
U6
1
AO3401A
Q1
1
AO3400A
Q2
1
32.768kHz
Y2
1
USB_C_Receptacle_USB2.0
J1
1
Battery
J2
1
SWD
J3
1
UART
J4
1
Hours
J5
1
Minutes
J6
1
Seconds
J7
1
2A
F1
1
~
JP1
3
10k
RV1, RV2, RV3
1
ShowDate
SW1
Show 34 more
QtyPartRefs
1
FG95A
VFD1
1
SSL14
D1
1
BZV55B5V6
D2
1
CD4148W
D3
1
6.2V
D4
2
15uH
L1, L2
1
4.7uH
L3
1
2.2uH
L4
5
100nF
C1, C6, C10, C19, C24
5
10uF
C2, C4, C5, C7, C9
1
0.22uF
C3
7
10pF
C8, C12, C13, C15, C17, C18, C25
1
4.7nF
C11
1
1nF
C14
1
4.7uF
C20
2
4.7uF
C21, C22
1
1uF
C23
2
5k1
R1, R2
5
100k
R3, R4, R8, R12, R28
2
820k
R5, R13
1
1k8
R6
1
300k
R7
1
1k
R9
1
120k
R10
1
270k
R11
1
68k
R14
1
15k
R15
1
390k
R16
1
10k
R17
4
22k
R19, R20, R29, R30
3
51k
R21, R22, R23
2
3R9
R24, R27
2
470
R25, R26
1
1M
R31

NeedleDCF77 design files

The KiCad project lives in the Dzalex/NeedleDCF77 repository on GitHub; these links point at the commit this page was built from.

NeedleDCF77: common questions

What microcontroller does the NeedleDCF77 use?

The NeedleDCF77 is built around the STM32L051C8Tx, from the STM32 family.

How big is the NeedleDCF77 PCB?

The NeedleDCF77 measures 130 × 30 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the NeedleDCF77?

85 components, from 54 distinct parts. The full bill of materials is listed on this page.

Where can I download the NeedleDCF77 design files?

From the Dzalex/NeedleDCF77 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the NeedleDCF77 design in my own project?

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

Can I test firmware for the NeedleDCF77 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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