Pocket-Sized Wire and Loop Toy

This is a small, simple and fun project that is guaranteed to provide hours of entertainment! The aim of the game is to loop the loop all the way around the wire without touching it. If the loop touches the wire it makes the buzzer sound and light flash.

You will need:

• A buzzer
• A button cell battery holder (one that holds two batteries)
• 2 lithium 3v batteries
• Heat shrink tubing
• A red LED
• A  73mm X 51mm X 25 mm project box
• Some jumbo paper clips ( I only had the insulated kind so I had to take off the insulated layer)
• Wire
• Electrical Tape

Tools you will need:

• Drill
• Sand Paper or file
• Screwdriver
• Pliers
• Breadboard
• Hot glue gun

The first, and most important thing to do, is to test out all the components and make sure that they are working. I used a breadboard and jumper wires.

Using some pliers, bend the wire into your desired shape. You can always change the shape later on but it is best that you have the basic design down now.

The next thing you need to do is drill two holes in the project box where the wire will go. I used a 1.5 mm drill bit to do this.

Next, poke the wire through the holes at the top of the lid and hot glue the wire to the inside of the lid. Make sure a bit of the wire is popping out of the hot glue so you can make your electrical connections.

  Now for the complicated part, building the circuit! But before connecting up the circuit remember to make the little loop that is a crucial part of the game. I used some needle-nose pliers and bent one of the paperclips into shape. 
 
  So here is the schematic for the circuit, starting from the loop. The loop is connected to + terminal of the buzzer. The - terminal  of the buzzer is connected to the + terminal on the LED. The - terminal on the LED is connected to the - terminal on the battery and finally, the + terminal on the battery is connected to one end of the wire.
 
  After soldering together all the connections, I used heat shrink tubing and electrical tape to ensure that the circuit doesn't short out.

Now set the circuit aside, because it is time for some more drilling! You need to drill one hole for the LED, I used a 5.5mm drill bit, and a couple of little holes so the buzzer can be heard.

Next, glue the buzzer directly underneath where the holes in the lid will be, and glue the LED in the hole you previously drilled.

Using a file, make a small ridge where the wire feeding out to the loop will go.

The last step is to screw up the box and make sure everything is in the correct place. Before screwing up the box make sure that the wire feeding out to the loop is in the ridge you recently made. Then, I made a handle for the loop by wrapping electrical tape around the base of it .

Here is a video of it in action!