Spynet Laser Trip Wire

Product Information

This is my first time using the fancy switches etc in the DLC. Thanks to some ideas from another thread, I placed the big powered roll up door from the factory across the roadway at Sanctuary. I set a laser tripwire to cut power to it whan triggered by enemies only. That closes the door. Anything that is not hostile will not trigger the tripwire. Carla can come and go with no problem. But, after an enemy triggers the tripwire, it does not reset. You must cycle power to the tripwire to reset it and open the door again. I am looking to see if a non-mod way can cycle the power after some time. In IDLE, create a new file, enter the final code below, and save it: from gpiozero import LightSensor, Buzzer To make the wires breadboard friendly, solder them to a short hookup wire that will allow you to attach them to the breadboard. If you prefer, you can remove the breadboard and instead connect the circuit up directly by poking the legs of the components into female-to-female jumper wires, with the long capacitor leg and an LDR leg together in one wire end, connected to the relevant pins.

your_ip_optional_port will most likely be empty unless your apache server is running on a port other than the default 80. I already had a server running on 80 so I set my pi to run on 8080. The port_to_camera will be the port you specify your camera to run on using mjpeg streamer.This tutorial shows you how to construct a laser tripwire that plays an alarm when the laser is interrupted. It uses a photoresistor to sense the presence of a laser beam and use a standard piezo element to play sound straight from an Arduino without an amplifier. buzzer.beep to make the buzzer turn on and off repeatedly at the default length of one second. To stop it, close the Python shell window while it is off. Test the tripwire One 200k resistor Really any large resistor will do. I tested it with a 1M resistor and it worked fine. FYI 10k was too small. Both the laser and the piezo element come with small wire leads that are not at all breadboard friendly. Because you are building the project on a breadboard you'll need to prepare them. 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.

Solder a piece of wire between the terminals where the button was. Now when power is supplied to the laser it will turn on automatically. is there a resonable way to do a reset with just vanilla items? I saw one guy trying to explain how to use a pressure plate to do the reset. I do not understand what he did. Does a pressure plate automatically reset after a time? If you enjoyed making this project, then you can find many more GPIO Zero guides in our GPIO Zero Essentials book!Keeping the laser aimed at the photo-resistor, flip the switch to arm the device and use a finger to break the laser beam (this sounds more exciting than it is). You should be rewarded with the alarm melody. The melody for this project should be recognizable to most of mankind as an ominous alert that something nefarious is occurring. Unless you’re working in a darkened room, you’ll probably notice little difference between the measured light level when the laser pointer is directed onto the LDR and when it’s not. The initial status is written to a console using a ternary expression. The pin's current state is read with Read(). If it's PinValue.High, it writes the Alert string to the console. Otherwise, it writes the Ready string.

Laser beams that are visible in daylight or even in the dark are very powerful and can be extremely dangerous. In this project we’ll use a low-powered laser pen instead. An LDR (also known as a photocell) is a special type of electrical resistor whose resistance is very high when it’s dark, but reduced when light is shining on it. By placing a capacitor in series with a light-dependent resistor (LDR), the capacitor will charge at different speeds depending on whether it is light or dark. We can use this to create a laser tripwire! There is also a Delayed Switch that you can connect a Terminal to (after hooking it up to what you want to affect) and set it for 1/8s up to 10s. Since you want something that 'fires' after about 60secs, then you will have to set up six of these in series, so that each one 'waits 10s then fires, passing on the current to the next' - six times. At the end, set the Gate to toggle (along with the Laser Tripwire), then it will also 'reset itself'. Again, the polarity has to be correct: connect the column of the buzzer’s longer leg to GPIO 17, and the shorter leg to a GND pin. Let’s test whether it is working. In IDLE, create a new file, enter the code below and save it: from gpiozero import Buzzer

Laser Safety

Lasers are not toys. Ensure that you know how to handle a laser safely by reading the information on laser safety . This will give you precautions on different classes of lasers. Some sort of breakout kit for the raspberry pi so you can have easy access to the pins on the processor. Finally, we use a never-ending while True: loop to continually display the current value of the light sensed by the LDR, which ranges from 0 to 1. Build the app. If using the .NET CLI, run dotnet build. To build in Visual Studio, press Ctrl+ Shift+ B. 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.