Arduino Motion Detecting Squirt Gun

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In case you want a nerdier way to make a cheap motion detecting squirt gun, Here’s how you can build your own with an Arduino and a PIR sensor!

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Acquiring the Parts
Here’s what you will need:

  1. Raid Auto Trigger
  2. Arduino
  3. PIR Motion Sensor
  4. Diode
  5. NPN Transistor
  6. Wire cutters and wire

TOTAL COST: ~$45.00

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Disassemble the Automatic Sprayer
Wire Up The Arduino
Here is a schematic of the Arduino. You can download the Fritzing files by clicking on this link. Screen Shot 2014-03-29 at 3.15.19 PM [tabby title=”Step 3″]

Add The Code
Here is a copy of the Arduino code to upload to your arduino. You can also download it by clicking on this link. const int pirPower = 13; const int pirIn = 12; int motorPin1 = 3; void setup(){ pinMode(pirPower, OUTPUT); pinMode(pirIn, INPUT); pinMode(motorPin1, OUTPUT); digitalWrite(motorPin1, LOW); digitalWrite(pirPower, HIGH); } void loop(){ int value= digitalRead(pirIn); if (value == HIGH){ digitalWrite(motorPin1, HIGH); delay(500); digitalWrite(motorPin1, LOW); } }

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Motion Detecting Squirt Gun Prank

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In this April Fools day video, learn how to make a cheap motion detecting squirt gun using parts that you can find in your local grocery store!

If you want a geekier way to build a motion detecting squirt gun, check out the Arduino version of this same project.

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Acquiring the Parts
Here’s what you will need:

TOTAL COST: ~$25.00

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Disassemble the Air Freshner
Disassemble the Automatic Sprayer
Connect the Air Freshner to the Automatic Sprayer
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How To Make An Auto Hacking USB Drive


This video will show you how to make an auto-hacking USB drive and how to protect yourself from them.
You can find all scripts at my forum post: http://www.tinkernut.com/forum/video-tutorial-help/how-to-make-an-auto-hacking-usb-drive
U3 Universal customizer- http://www.u3community.com/viewtopic.php?t=434
Batch to exe converter http://download.cnet.com/Bat-To-Exe-Converter/3000-2069_4-10555897.html
Nirsoft Utilities http://www.nirsoft.net