Has anyone successfully made a doppler radar for measuring bullet speeds using hb100?
>>2957765No, but I made a light sensor for measuring airgun bullet speeds that attaches to the barrel. 2 pairs of 2 IR LEDs at fixed distance, microcontroller on interrupts measures timing, calculates speed.
OP here. that's quite simple but not challenging enough people have used PC sound card for that too, just an op amp, few IR leds and two photodiodes
>>2957765You need to calculate the frequency range for the proposed bullet speeds then bandpass filter and amplifier. Most likely you can filter this out of whole rubbish.
>>2958299Also you'll have to open that box to get behind comparator BC iirc those shitty motion detectors output a meander for the most massive moving object. That wouldn't do . take the signal right from the mixer, filter the needful and perhaps that'll do.
>>2957765did you ask chatgpt? i asked it something about your idea and this is what I got.Yes — you *can* write code for the cheap Doppler radar motion modules (like the **HB100**, **RCWL-0516**, or **CDM324**) to measure BB or pellet velocities… **BUT** you need to understand their limits first.Below is a breakdown of what works, what doesn’t, and an example of how you *could* build a small Doppler-based FPS meter.and it spit out a bunch of code, you should ask it if you haven't
