Are your displays boring? Are 3D static displays no longer 'doing it' for you? Tired of American reenactors no longer taking their hits?

Then I have just the thing for you! This contraption is an automatic sensor that pops off an S mine into the air once someone gets within a foot of the device. It triggers a 3 second delay, then launches the mine about 3 ft high, just like the real thing.

what you'll need:

• 4" PVC tube
• 4" PVC end cap
• 4 AA battery container (https://www.amazon.com/dp/B07T7MTRZX?ref=ppx_yo2ov_dt_b_fed_asin_title)
• mini breadboard
• arduino Rev3 (inside mounting case)
• 45kg servo
• 3/4" PVC tube
• 3/4" wood dowel x 1"
• 9/16 x 5" compression spring
• codder pin
• 10-24 x 1" nuts and bolts (x4)
• 9 volt battery
• 9 volt DC plug (https://www.amazon.com/dp/B01AXIEDX8?ref=ppx_yo2ov_dt_b_fed_asin_title)
• dupont cables
• on/off rocker switch (https://www.amazon.com/dp/B0B6ZRMQLW?ref=ppx_yo2ov_dt_b_fed_asin_title)
• 4 SR04 ultrasonic sensors
• 4 AA batteries

To create the base:

• cut the 3/4" PVC tube down to 95mm
• drill 2 holes all the way through, one hole 13mm from the bottom, one 82mm from the bottom.
• cut the codder pin in half. one half will hold the bottom of the spring, the other half will go into the servo and hold the top.
• drill a hole in the middle of the wood dowel
• make sure the bottom codder pin sits flush with the pvc, insert into the base.
• bend the other half of the codder pin to secure into the servo arm and have 1" extending out.
• put the servo into the rectangle hole (the crescent side should be pointing down, insert the servo pointing to the right, slide all the way to the left.)
• put the spring into the tube and compress with the wood dowel. With the dowel hold and pvc hole lined up, swing the servo arm to have the pin through both holes.

for the main housing:

• cut the 4" pvc tube down to 8 3/4"
• cap off one end.
• put the sensor holder over the top and slide the chimney and housing into their slots, place the support under each.
• drill a hole into the tube where the supports will sit. (the bolt head will be inside the tube)
• the chimney will also need a hole cut into the PVC for airflow, the hole should be about 40 x 40mm
• cut the hole for the housing wires to pass through.
• mount the chimney and housing to their supports first (bolt pointed up) then mount the supports to the main tube
• use the pegs to fix the housing to the sensor holder
• put the 4 sensors into their mount and fix to the holder

for the electronics:

• everything should be wired beforehand to make it a little easier (check the wiring diagram)

• for the housing part:

• add the breadboard first into the holder.

• slide the arduino all the way down with the USB port pointing down

• insert the on/off switch through the hold in the top lid

• the AA battery pack will sit on the bottom and the 9 volt will sit on top of that.

• the servo wires will pass through the hole in the back.

• the sensor wires will go through the slits on the top sides of the housing -- press the wires into the housing and slide the front cover down

• place the lid

• and now you have your own Le soldat silencieux.

• this is designed to be buried in the ground up to the top rim of the pvc tube, allowing it to be as low profile as possible and still function.

---------- to reload after use-------------------

• turn the unit off
• unplug either one or all 3 wire from the servo
• remove the base from the tube -recover your dowel and spring, reassemble using the same installation instructions above
• place back down tube, reconnect the servo pins.
• top with the S mine
• switch back on and run away (you have 10 seconds)

------ i know the picture model is different than the design model, this one is improved from the first model I created.

------- if anything is unclear or you need help, leave a comment ------- remixes and improved designs are welcome.