• on Test & Measurement
  • Published in issue 7/2018 on page 48
About the article

Experimental Doppler Radar

or how to build your own speed trap

LABSPROJECT
Based on a Labs project | May 2018 | Find it here
Experimental Doppler Radar
A couple of years ago I read an article about small radars. After that I also began noticing product news items from various companies about small, low-cost radar transceiver chips and modules, and so I decided to do a hobby project on microwave radar. Here’s what I came up with.The aim of the project was to build a microwave Doppler radar by using an, low-cost off the shelf radar module. The most interesting thing as I see it was to learn new things and make electronics bits and pieces work as planned.
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Products
Relevant websites
Extra info / Update
Features
* Measures speed of moving targets
* Commercially available low power radar module
* K-band (24 GHz)
* Range 60 m minimum; 100 m usable
* Resolution 0.24 m/s
* Easy-to-understand digital signal processing
* Universal dsPIC baseboard can be repurposed for other applications

@ www.elektor.com
- Experimental Doppler Radar, bare PCB www.elektor.com/doppler-radar-pcb
- dsPIC33EP128GP502, programmed www.elektor.nl/doppler-radar-dspic
- K-LC5 Doppler radar transceiver www.elektor.com/k-lc5
Component list
Component List
Resistors
R28,R42 = not fitted*
R5-R11,R23,R24,R36,R38,R40 = 1kohm
R12 = 2kohm
R1-R4,R13-R20,R29*,R30,R31,R34,R35,R37,R39,R41,R44* = 10kohm
R25 = 20kohm
R43* = 31.6kohm
R27 = 64.9kohm
R21,R22,R33 = 100kohm
R32 = 180kohm
R26 = 210kohm

Capacitors
C17 = 1nF
C2,C3,C4,C5,C8,C16,C19* = 100nF
C1 = 1µF 16V
C6,C7,C9,C10,C13,C14 = 2.2µF 16V
C11,C12,C15,C18,C20*,C21* = 10µF 16V

Inductor
L1 = 15µH

Semiconductors
D1 = MBRS540
D2* = 1N4148WS
D3* = MBR120
IC1 = dsPIC33EP128GP502-I/SS
IC2 = AD7680-ARJZ
IC3 = ADP3336-ARMZ
IC4* = ADP2370-3.3
IC5 = ADP150AUJZ-3.0-R7
IC6,IC7,IC8,IC9 = SI3865DDV
IC10 = AD8656ARZ
IC11* = MCP16301
LD1,LD2,LD3 = SA10-21SRWA 7-segment display, CA, 1" height,
OSC1 = 8MHz oscillator module, Abracon ASFL1-8.000MHZ-EK-T
T1,T2,T3,T4,T5,T6,T7,T8 = BC847C

Miscellaneous
BAT1 = 9V battery holder (Keystone 1294)
K1,K2 = 2-pin pinheader, 0.1" pitch
K3 = 3-pin pinheader, 0.1" pitch
K4 = 6-pin pinheader, 0.1" pitch
K5,K6,K7,K8 = 5-way pinheader socket, 0.1" pitch
RFBeam type K-LC5 Doppler radar transceiver
Power switch or jumper for K1
Enclosure: Bud Industries PN-1323-C
PCB # 160385-1

* see text for options and considerations
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