Hello, I'm trying to build automatic target detection system for .22 Long Rifle ammunition, the hit plate is gonna be made of stainless steel and the ammunition is lead The idea is to use some kind of sensor to detect impact on the hitPlate which you can on the picture here [WhatsApp Image 2021-10…

I can read the values, but sometimes I get high value sometimes I get low value, even I'm hitting the plate the almost the same way, I'm not trying to make it too sensitive since I only wanna detect an ammo hitting it

Does the sensor have any markings on it at all ?

Connect the piezo to the inputs of an opto-isolator and connect the opto outputs to Arduino GND and an IO pin set as INPUT_PULLUP.

Piezo disks can generate some high values albeit for short period of time. I wouldn't use an opto isolator as I don't see a piezo reliably powering the required input. What you need to do is limit the voltage from the Piezo to the Arduino with a 5V TVS or Zener, then add a 10k between the zener an…

[image] JohnRob: The best attachment would be a relatively hard epoxy. Possibly non acid silicone would be much better.

Possibly non acid silicone would be much better. That is your logic for your recommendation of silicone for attachment? Silicone rubber will absorb and dissipate some of the impact, hence a harder material is recommended.

Now I may be being silly here but I am very curious how well an accelerometer, even a hobby grade one, would detect the impact. If the OP ever decides on using an accelerometer post the results here.

[image] JohnRob: Piezo disks can generate some high values albeit for short period of time. I wouldn't use an opto isolator as I don't see a piezo reliably powering the required input. What you need to do is limit the voltage from the Piezo to the Arduino with a 5V TVS or Zener, then add a 10k …

I’d be tempted to put an op amp in to help capture and condition the pulse .

Hit Plate impact detection for .22 Long Rifle ammunition

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wildbill October 25, 2021, 2:09pm 17

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Hit Plate impact detection for .22 Long Rifle ammunition

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