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MMDVM HS Hat

VR2VYE·MMDVM_HS_Hat

MMDVM HS Hat layout, top view — open source STM32 board by VR2VYE
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About the MMDVM HS Hat

MMDVM HS Hat is an open source STM32 PCB design by VR2VYE, published on GitHub. It is a 2-layer board measuring 65.1 × 30.2 mm, with 75 components from 42 distinct parts.

Its main chip is the STM32F103C8T6, from the STM32 family. Other key parts include the ADF7021. By type, the board carries 31 capacitors, 19 resistors, 9 diodes, 6 inductors, 4 connectors and 2 ICs.

It belongs with the displays & leds and dev boards & breakouts designs in this gallery.

From the project

This project provides a Raspberry Pi Hat for the MMDVM_HS Hotspot. It was designed for the Raspberry Pi Zero, but should work on any other Pi with the Hat interface.

This project provides a Raspberry Pi Hat for the MMDVM_HS Hotspot. It was designed for the Raspberry Pi Zero, but should work on any other Pi with the Hat interface.

First revisions of the board have been built successfully!

The PCB is designed in KiCad and the necessary libraries are included. The supplied Gerber files can be used to order PCBs, for example at Elecrow or DirtyPCBs. The board's dimensions are 65x30mm.

MMDVM HS Hat, from the project README
From the project README

Main components on the MMDVM HS Hat

ADF7021STM32F103C8T6

MMDVM HS Hat bill of materials (BOM)

75 components, 42 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ADF7021
U1
1
STM32F103C8T6
U2
1
TCXO
X1
1
8MHz
Y1
1
I2C
P1
1
DISPLAY
P2
1
SMA
P3
1
STLINK
P4
1
CERAMIC_ANTENNA
AE1
1
DNI
SW1
3
red
D1, D4, D8
2
green
D2, D5
2
yellow
D3, D6
1
amber
D7
1
blue
D9
1
22n
L1
1
20n
L2
1
13n
L3
1
27n
L4
1
10u
L5
Show 22 more
QtyPartRefs
1
18n
L6
2
6p8
C1, C6
6
10n
C2, C7, C9, C17, C19, C22
1
220p
C3
1
10p
C4
1
4p7
C5
11
100n
C8, C10, C15, C16, C20, C24, C25, C26 +3
1
22n
C11
1
470p
C12
1
15n
C13
1
1n
C14
1
22p
C18
2
20p
C21, C23
1
10u/10V
C30
1
10u
C31
2
10k
R1, R7
1
1k1
R2
1
3k8
R3
1
3r9
R4
1
560
R5
1
270
R6
12
1k
R8, R9, R10, R11, R12, R13, R14, R15 +4

MMDVM HS Hat design files

The KiCad project lives in the VR2VYE/MMDVM_HS_Hat repository on GitHub; these links point at the commit this page was built from.

MMDVM HS Hat: common questions

What microcontroller does the MMDVM HS Hat use?

The MMDVM HS Hat is built around the STM32F103C8T6, from the STM32 family.

How big is the MMDVM HS Hat?

The MMDVM HS Hat measures 65.1 × 30.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the MMDVM HS Hat?

75 components, from 42 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the MMDVM HS Hat design files?

From the VR2VYE/MMDVM_HS_Hat repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the MMDVM HS Hat design in my own project?

The repository has no license, so all rights stay with VR2VYE. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the MMDVM HS Hat 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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