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  • EliBuilds commented on EliBuilds's instructable Raspberry Pi Laser Security System1 month ago
    Raspberry Pi Laser Security System

    Thanks for checking out the project! I think you could use this exact system to accomplish your goal. In my design I used a specific photodiode that was optimized for the laser that I was trying to detect. This reduced background noise such as lights turning off and on in the room, and in your case, it would reduce noise produced from the sun passing behind the clouds. I don't know how much of this project you have looked at, but if you look at step 8, you could modify the read_pin.py file to log the time to a database (lines 19 through 21). Typical python code is below.f = open('file.txt','w')f.write(hr+':'+min+':'+sec+'\n') f.close()If the laser tripwire does not work out you could try some of these other sensors.-PIR sensor : https://www.sparkfun.com/products/13285 This will not ...see more »Thanks for checking out the project! I think you could use this exact system to accomplish your goal. In my design I used a specific photodiode that was optimized for the laser that I was trying to detect. This reduced background noise such as lights turning off and on in the room, and in your case, it would reduce noise produced from the sun passing behind the clouds. I don't know how much of this project you have looked at, but if you look at step 8, you could modify the read_pin.py file to log the time to a database (lines 19 through 21). Typical python code is below.f = open('file.txt','w')f.write(hr+':'+min+':'+sec+'\n') f.close()If the laser tripwire does not work out you could try some of these other sensors.-PIR sensor : https://www.sparkfun.com/products/13285 This will not give you very accurate times, but it is very reliable when it comes to detecting the car. It is designed for wide range motion sensing but you could just place it in a Styrofoam cup to focus the detection beam. You could plug this into the raspberry pi directly instead of building any circuitry.-A short length of garden hose across the road with both ends capped and a pressure sensor tapped into the hose. When the car runs over the hose there will be a pressure spike that the pi could detect. This would be much more difficult to set up on the computing side, but would be very accurate on the timing.- Induction loop sensor: https://en.wikipedia.org/wiki/Induction_loop This is what you see at large intersections to monitor traffic flow. You will have to amplify the signal before feeding it into the pi. I am not sure if the pi can read analog signal so you may need to introduce a conversion microcontroller to do the signal processing and then output digital to the pi.Hopefully there is some helpful information here. Let me know if you have any questions.

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  • EliBuilds commented on kjo789's instructable Medium sized DIY - CNC 20" x 30" work area3 months ago
    Medium sized DIY - CNC 20" x 30" work area

    Very cool project! I am just curious if you looked a linuxcnc as a possible machine controller? In my build I tried mach3 but stuck with linuxcnc after having a pretty serious crash with mach3. It is very stable and may solve your jitter issues. Thanks for sharing!

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  • EliBuilds commented on EliBuilds's instructable Raspberry Pi Laser Security System4 months ago
    Raspberry Pi Laser Security System

    You could always just build the laser detection circuit and put a buzzer on the led signal output. That is covered in the first few steps. The programming part is mainly just to send the email and is a basis for incorporating this system into another program. My first design was using a mirror to reflect the laser back to the sensor like you suggested. However, adjusting the reflection mirror is very tedious. A very small angle change in the mirror will have a massive impact on the reflection point. This problem will be amplified as the distance between laser source and mirror is increased. You may also find that as dust gathers on the mirror it will slowly degrade the laser strength until the tripwire is randomly triggered.

    Thank you! I was thinking of setting the laser trip wire up next to the cat food as our house has such a low number of actual intruders.

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