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Radar MCU

ckflight·FMCW-RADAR·Radar MCU/Radar MCU.kicad_pcb

Radar MCU PCB layout, top view — open source STM32 board by ckflight
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About the Radar MCU PCB

Radar MCU is an open source STM32 PCB design by ckflight, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 36.9 × 32.9 mm, with 98 components from 35 distinct parts.

Its main chip is the STM32F405, from the STM32 family. Other key parts include the AP3211, LP2985_10, MCP4022_202, LT1817 and MAX1426. By type, the board carries 44 capacitors, 34 resistors, 7 ICs, 4 connectors, 2 transistors and 2 diodes.

It belongs with the audio designs in this gallery.

From the project

Frequency Modulated Continuous Wave Radar hardware and software design files with 26 dBm output power covering around 250 m.

Check the new design's Python files for better processing and analysis https://github.com/ckflight/FMCWRADAR2v2

$$ Range(radar) = {\sqrt[4]{Pt G^2 \lambda^2 \sigma \over Pmin 4\pi^3}} $$

* Receiver chain has LNA, Gain Block and Mixer. The gain block drops the Noise Figure from 7 dB to 2 dB, which doubles the detection range. To determine the radar detection range, minimum detectable signal is needed. RF receiver chain has thermal noise and it determines the noise floor for Pmin. Signal to Noise (SNR) ratio of 20 dB is assumed for a good detectable signal then:

Radar MCU, from the project README
From the project README

Main components on the Radar MCU

AP3211LP2985_10STM32F405MCP4022_202LT1817MAX1426

Radar MCU bill of materials (BOM)

98 components, 35 distinct parts.

QtyPartRefs
2
AP3211
U1, U2
1
LP2985_10
U3
1
STM32F405
U4
1
MCP4022_202
U7
1
LT1817
U8
1
MAX1426
U9
2
BSS138
Q1, Q2
1
8MHz
Y1
1
SWD_DEBUGGER
J1
1
USB_MicroB
J3
1
Connector_02x15
J4
1
GPIO_EXTRA
J5
2
Led_Diode
3V3, 5V
2
SDM2U30CSP_7
D1, D2
2
4.7uH
L1, L2
4
10uF
C1, C2, C15, C28
5
22uF
C3, C6, C9, C43, C44
3
10nF
C4, C7, C10
7
2.2uF
C5, C11, C16, C17, C19, C20, C29
17
100nF
C8, C12, C13, C14, C18, C23, C24, C26 +9
Show 15 more
QtyPartRefs
2
15pF
C21, C22
2
33pF
C25, C38
2
100pF
C32, C33
2
1uF
C39, C40
3
22
R1, R2, R16
1
14.7K
R3
4
4.7K
R4, R23, R27, R31
3
100
R5, R6, R22
6
10K
R7, R8, R17, R24, R28, R29
3
0
R9, R10, R26
3
DNP
R11, R12, R25
7
1K
R13, R14, R18, R20, R32, R33, R34
2
2.49K
R15, R19
1
49.9
R21
1
24.4K
R30

Radar MCU design files

The KiCad project lives in the ckflight/FMCW-RADAR repository on GitHub; these links point at the commit this page was built from.

Radar MCU: common questions

What microcontroller does the Radar MCU use?

The Radar MCU is built around the STM32F405, from the STM32 family.

How big is the Radar MCU PCB?

The Radar MCU measures 36.9 × 32.9 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Radar MCU?

98 components, from 35 distinct parts. The full bill of materials is listed on this page.

Where can I download the Radar MCU design files?

From the ckflight/FMCW-RADAR repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Radar MCU design in my own project?

Yes, under the terms of its GPL-3.0 license, which ckflight chose for the repository.

Can I test firmware for the Radar MCU 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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