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A beloved coworker is returning from Canada soon and in his honor I have created the car horn prank box. Basically, when the red button is pressed, ...
You will need: (x1) Car horn (x1) Enercell 12V/5Ah Sealed Lead-Acid battery (Radioshack #23-945) (x1) Arduino Uno (Radioshack #276-128) (x1) LED hold...
Measure in 2" from one of the 6" edges of the enclosure's lid and make a centered mark. Drill through this mark with a 1/4" drill bit.
Insert epoxy into the base of the LED holder and then insert a small photocell. Clean the epoxy of the photocell leads if necessary. Let the assembl...
Crimp on 4 red quick connects to 6" red wires, and 4 blue quick connects to 6" black wires.
In one of the opposite corners from the last hole drilled in the lid, drill a 1/2" hole, and two 1/4" holes, which are all spaced about 1/4" apart.
Insert the pushbutton switch into the 1/2" hole and fasten it in place with its mounting nut. In the adjacent 1/4" hole, install the red LED (in hold...
Take the dual pc board and snap it in half such that it is divided into two seperate boards.
Apply thermal paste to a heatsink and then mount a 7805 voltage regulator using a 1/4" x 4-40 bolt. Clean away any excess thermal paste from the side...
Download the attached template and use it to cut both shapes out of 1/4" plywood. Glue the plywood shapes together to form an L-assembly.
Mount the Arduino to the L-assembly using 4-40 x 1/2" nuts and bolts.
Assemble the circuit board by including the voltage regulator components (these are the 7805 regulator, 10uF capacitor, and 0.1uF capacitor), and also...
Cut a 6" red wire and strip a little insulation off the end. Using a wire nut, twist this together with the ends of three of the red wires with quick...
Cut a 6" black wire and strip a little bit of insulation of the end. Using a wire nut, twist this together with two of the black quick connect wires....
Solder the TIP31 transistor to the circuit board connect a 1K resistor to the base pin (the leftmost pin). Connect the emitter to ground on the circu...
Attach a 6" red wire to one of the terminals on the pushbutton switch, and a 6" green wire to the other. Attach a 6" red wire to the LED's anode (lon...
Insert a drop of hot glue between the leads of the photocell and LED to insulate them and keep them from bending into contact with one another.
Solder a 1N4004 diode between the coil pins (pins 85 and 86) of the relay as close to the base of the relay as possible.
Attach the switch, LED and photocell to the circuit board as appropriate based on the circuit diagram. Additionally, solder a 6" red wire to +5V powe...
Fasten the relay to the singular hole on the base of the wooden L-bracket using a 1" x 6-32 but and bolt.
Fasten the circuit board to the base of the wooden L-bracket with 1/2" x 6-32 nuts and bolts.
Connect the red wire from the circuit board to the 5V pin on the Arduino. Connect the black wire to one of the ground pins on the Arduino. Attach th...
Connect a 12V quick connect wire to the cathode side of the relay coil. Connect the black wire from the TIP31 collector pin to the anode side of the ...
Attach another quick connect to the other end of the lone black wire attached to the relay.
Program the Arduino with the following code: /* Car Horn Prank Box by Randy Sarafan - 2013 When the red button is pressed, an LED blinks for thirt...
Put the wooden L-bracket into the enclosure.
Place the battery in the cutout adjacent to the relay and the circuit board. Connect a black wire from the circuit board's ground to the ground termi...
The last thing that needs to be wired into the circuit is the car horn. It is highly recommended that you wear hearing protection when wiring the horn...
Mount the horn to the inside of the lid using the 1/4" hole drilled earlier.
Close the lid and fasten it shut.
To arm the Car Horn Prank Box, press the red button. The LED will flash on and off for 30 seconds. During this time, you should hide the prank box so...
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