31 Mar '17, 11am

The Right Circuit Turns Doppler Module into a Sensor

The Right Circuit Turns Doppler Module into a Sensor

Can you buy a working radar module for $12? As it turns out, you can. But can you make it output useful information? According to [Mathieu], the answer is also yes, but only if you ignore the datasheet circuit and build this amplification circuit for your dirt cheap Doppler module . The module in question is a CDM324 24-GHz board that’s currently listing for $12 on Amazon . It’s the K-band cousin of the X-band HB100 used by [Mathieu] in a project we covered a few years back, but thanks to the shorter wavelength the module is much smaller — just an inch square. [Mathieu] discovered that the new module suffered from the same misleading amplifier circuit in the datasheet. After making some adjustments, a two-stage amp was designed and executed on a board that piggybacks on the module with a 3D-printed bracket. Frequency output is proportional to the velocity of the detected o...

Full article: http://hackaday.com/2017/03/31/the-right-circuit-turns-do...

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