Airsoft Defuse Prop Bomb.

I am an airsoft team player, and we want to spice a little beat our games.

I look over the Internet, to find some scenarios to the games. Finally I bumped up with one Instructables project. ntewinkel your project was inspiration for me to build something similar. Thanks.

Step 1: Preparations.

11 x plastic pipes 20mm in diameter (about 0.78 inch) 300mm long (about 11.81 inch). Paint with matte orange color. See the picture

1 x plastic pipe 50mm in diameter (about 1.97 inch) also 300mm long (11.81 inch) to hide the battery holder in there.

1 x battery holder for Li-ion 18650.

2 x Li-ion 18650 3.7v 6000mAh .

1 x box for electronics - mine (LxWxH) 120mm X 100mm X 30mm (4.72 x 3.93 x 1.18 inch).

1 x Arduino Nano board.

1 x 8 Ohm speaker like this one.

1 x Audio amplifier like this one - I took mine from the old USB speakers.

3 x 10k resistors.

2 x Push buttons.

3 x Toggle Switches.

1 x 4 x 7segment (Common Anode) block based on SN74HC595D Shift register.

1 x Black duct tape.

Step 2: Assembly.

Assembly circuit according the schematics. In Fritzing schematics key switch is missing (did not find such part in they libraries). Also the green TSSOP16 part stands for Audio Amplifier.

Drill holes for the switches and buttons in the box. Cut out rectangular hole for 4x7segment block. Assembly all together.

* I didn't solder toggles switches wires to the board, I use 2-Pin Wire Jumper Pin Header Connector (see a picture). This allows me to change the order of switches for each game.

Glue the 11 colored plastic pipes to the big one.

I use tie wraps to wrap the box to the pipes. Add duct tape to make it more realistic. See picture.

Step 3: Code.

If you are using Common Cathode 7 segment, use commented lines instead those in the code.

Flash this code to Arduino Nano.

Step 4: Instructions.

This 7 segment block is NOT like the regular clock with colon. Instead of colon you will see the dot between 2 first segments and 2 last segments. The time is in a minutes and seconds. Max time that can be set is 1 hour, it will be shown as 59.59

1 push = 1 minute.

Set the time and push the START button. Game begins.

The Zero switch - zeroed time and you lost.

The SpeedUp switch - speeds up the time, if count goes to zero you lost.

The Stop switch - stops the count and you win.

If you toggle SpeedUp switch, you can toggle Zero or Stop switch, the result will be the same as described before.

If you lost the game you will hear siren 3 times. Nice win tones will be played if you win, after that the system will reset and you can set up the time and start new game.

Enjoy.