CDM324 Doppler Speed Sensor - Arduino Compatible

Name: CDM324 Doppler Speed Sensor - Arduino Compatible
SKU: 9134
Price: 36.00 USD
Availability: Discontinued
Rating: 3.31 (4 reviews)

(4 Reviews)

Speed and Pseudo-Distance Sensor Using the Doppler Effect

Designed by Stephan Electronics in Switzerland

Product Retired

This product is no longer available for sale.

The seller may be offering an improved version or it may be hanging out on the beach, enjoying the retired life.

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CDM324 Doppler Speed Sensor - Arduino Compatible 1

CDM324 Doppler Speed Sensor - Arduino Compatible 2

CDM324 Doppler Speed Sensor - Arduino Compatible 3

CDM324 Doppler Speed Sensor - Arduino Compatible 4

CDM324 Doppler Speed Sensor - Arduino Compatible 5

CDM324 Doppler Speed Sensor - Arduino Compatible 6

2017-03-12T15:35:30.669Z-cdm324_assembled_quarter.JPG

2017-03-12T15:35:30.669Z-cdm324_assembled_patch.JPG

2017-03-12T15:35:30.669Z-cdm324_assembled.JPG

2017-03-12T15:35:30.669Z-cdm324_pcb1.JPG

2017-03-12T15:35:30.669Z-cdm324_pcb2.JPG

2017-03-12T15:35:30.669Z-cdm324_size.JPG

Speed and Pseudo-Distance Sensor Using the Doppler Effect

This product has been discontinued, its replacement can be found here Overview The CDM324 Doppler modules you can find on eBay need some electronics to be operated. This listing is for a CDM324 with…

Overview

The CDM324 Doppler modules you can find on eBay need some electronics to be operated. This listing is for a CDM324 with its backpack, which contains all the necessary components.
To make it work, you just need to apply 5V and you're good to go! You may find Arduino sample code on my webpage.
Shipping will be done from Switzerland or Shenzhen depending on current stock and customer location.
Another batch is in production and should be ready around August 15th

Input & Output signals

5V / 50mA input
Frequency output, proportional to the object's speed
Voltage output, proportional to the amount of reflected RF signal

Please have a look at the video below which shows what you should expect.
For advanced technical specifications, please have a look at my webpage.
Please also check that this Doppler sensor follows your country regulations.

Speed measurement capabilities

As you can see in the video below this Doppler sensor is made to measure walking / running speeds from tens of meters away.
It will however be able to measure much faster objects when they are close to the sensor. For more advanced details on what to expect you may read the dedicated paragraph on this webpage.
Don't hesitate to also read about my cheaper HB100 doppler module on tindie.

Review Breakdown

Average Ratings

Product: (3.00)

Documentation: (3.25)

Shipping: (3.75)

Communication: (3.25)

Mohd | March 20, 2020

HQ Product, Fast Shipping, Useful Doc.

Hi Sir,
first of all thank you for fast shipping, but I paid two shipping fees and get it in same box :)

I've question, in CODE you use "19" for HB100 , and for CDM324 use "44" ..

From where you get this constant??

Rodrigo | May 16, 2019

Unfortunately does not work as shown on site. Bad for me.

I bought this 24GHz Doppler Motion Sensor for building speed radar.
Points I highlight as negatives:
- VOUT: It does not vary with frequency, so it's good for nothing.
- FOUT: It is not stable, the frequency varies wildly when there is no movement.
- Program: Since the signal in FOUT is unstable, I am trying to improve the software to prevent false reading. So far not good enough but I understand that this concern should be from the supplier to deliver a stable solution.
- I included a HC-05 in the project but had to withdraw because the 24GHz Doppler Motion Sensor was affected by interference and got worse than it was already ...
- I can not use the 24GHz Doppler Motion Sensor because I imagine the credibility of a radar that madly charges values on your display, even without cars passing by.
I'm disappointed, does anyone have any idea how to help me?

Response from Stephan Electronics | May 16, 2019

Hello Rodrigo,
We're very sorry to hear about your experience:
- VOUT: as mentioned in the documentation, this voltage is proportional with the distance between the moving object and the sensor
- FOUT: stability depends on the object moving and the environment the sensor is placed in. Have you tried averaging?
- HC-05: did you add decoupling capacitors?

Prakasit | March 29, 2019

Be bad!!

Is a hoax This circuit does not help increase the ability of CDM324, so it should be checked so as not to fool others.

Response from Stephan Electronics | March 29, 2019

Hello,
Could you let us know the problems you're encountering with your sensor?
We will be more happy to help, or refund you if you have a defective item.

Gary | June 7, 2017