CDM324 Doppler modules you can find on eBay need additional electronics to be operated. This listing therefore offers a CDM324 with its speed sensing board, which contains all the necessary components and even a display/expansion board (if selected).
To make it work, simply apply 5V and you're good to go!
2 expansion connectors provide access to the following inputs/outputs:
For more technical specifications and testing, have a look the dedicated webpage.
The CDM324 conforms to ETSI #300 440 (Europe), its 24.125GHz operating frequency is included in the IARU 1 & 2 Regions (Americas & Europe).
Please make sure that this Doppler sensor follows your country regulations.
The expansion board connects to the main device to offer the following features:
Together with stm32loader or our framework, one click firmware updates are possible using the RTS & DTS lines of the USB-UART converter:
A python user interface is available on our repository and can be used when connecting the speed sensor to your computer using a USB-UART adapter or our expansion board.
Note that the firmware update feature is only available when using our expansion board.
In this framework is also included the above tool (Windows only) to get advanced speed data information.
Speeds from 3.4km/h to 180km/h, (2.1mph to 112mph) may be measured.
Sensitivity will depend on the sensed object size and material, as metallic objects reflects RF waves much better than organic materials.
Please have a look at the video below to get an idea of what the sensor can do.
Given the extremely high amplification used, in some cases the noisy power supplies present in old computers and laptops may generate some unwanted spikes in the amplified spectrum, as can be shown below:
As a way to potentially mitigate this issue when connected to the sensor through USB, you may add a USB isolator to your purchase.
All of our devices are shipped from Shenzhen, China. It takes between 2 to 3 weeks to receive your order.