Devlog – Day 1

Date: August 13, 2026
Time Worked: 3 hours 30 minutes

Today I started working on my DIY radar speed gun project. I researched different microwave Doppler sensors and selected the CDM324 24GHz sensor because of its better resolution and ability to detect smaller and faster-moving objects.

I also planned the complete signal-processing system, from filtering and amplifying the sensor’s Doppler signal to processing it with an ESP32 and displaying the calculated speed on an SSD1306 OLED.

I sourced the main components and designed a custom two-stage conical horn antenna in CAD to improve the sensor’s directionality and range. I also researched how horn antenna size affects gain, which helped me set more realistic expectations for the additional detection range.

Next Steps

• Design the main body of the radar speed gun.
• Continue developing the wiring diagram.
• Plan the placement of the electronics inside the enclosure.