Shooting targets at varying unknown distances can be a challenge even for experienced shooters. Judging bullet drop can be a difficult task, and manual adjustments in the field are cumbersome. This process can be simplified by using existing technology - PowerPoint PPT Presentation

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Shooting targets at varying unknown distances can be a challenge even for experienced shooters. Judging bullet drop can be a difficult task, and manual adjustments in the field are cumbersome. This process can be simplified by using existing technology

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Title: Shooting targets at varying unknown distances can be a challenge even for experienced shooters. Judging bullet drop can be a difficult task, and manual adjustments in the field are cumbersome. This process can be simplified by using existing technology


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Senior Design Project Dec02-08
Shooting targets at varying unknown distances can
be a challenge even for experienced shooters.
Judging bullet drop can be a difficult task, and
manual adjustments in the field are cumbersome.
This process can be simplified by using existing
technology and formulas. The auto-adjusting scope
will make the proper adjustments so the shooter
doesnt have to, thus saving time and improving
accuracy.
The end result of the product will be a portable
device, to be mounted to a gun that will
automatically adjust the sights of a scope to
compensate for bullet drop.
Project will be broken down for simplicity
General Background Currently rangefinders can be
used to approximate distances to targets and
shooters can manually readjust their sights or
hold their sights over the target. However,
formulating an exact bullet drop in the field is
an awkward process, which is why most people
choose to guess bullet drop, but this method is
unreliable. A device mounted to a gun that would
compensate for different shooting distances would
provide the user with a considerable shooting
advantage. Technical Problems Component
interfacing rangefinder sensor, microcontroller,
LCD, shooting scope, keypad, and servo
Calculating bullet drop using distance to
target, predefined formula, and pre-entered
information Adjusting target scope according
to drop calculations
Operating Environment Temperature 20 F and 110 F Humidity 0 90 Shock Bullet discharge Assumptions Bullet drop can be accurately calculated Assume bullets from the same lot hold close tolerances
Intended users Hunters Target shooters Military Limitations Effective shooting distance 400 600 yards Servo and microcontroller must fit on riflescope
Bullet Drop Table
Target shooting at a variety of distances Testing
will be done with .22 caliber rifles Acceptable
results will be a pattern of five inches in
diameter Testing will be done on the bullet drop
formula The microprocessor will be tested by
comparing hand calculations with the correctness
of programming The laser rangefinder will be
tested at a number of distances and also tested
to see the types of objects it picks up
Estimated bullet drop on .223 caliber rifle.
Scope sites always on a target on X-axis at zero.
Design Objectives Design a simple user interface
that will allow entry of bullet
information Design flexible formulas that can be
used for multiple calibers Make the scope
adjustment system automatic
Functional Requirements Allow data input Allow pointing of the sensor at a target Calculate bullet drop for a given distance Auto Adjust scopes vertical adjustment Design Constraints Time Budget Space Must be small enough to attach to gun Caliber Prototype, .22 caliber rifles only
Measurable Milestones Finding a suitable formula
to calculate bullet drop Finding a servo with
enough torque to turn the vertical adjustment on
a standard riflescope Acquiring a laser
rangefinder sensor with serial interface Designing
a user interface that will allow for user
input Designing mounting hardware to mount the
servo to the scope
Personnel Effort Estimate
Jenny Custer 186 hours
Danielle Frey 189 hours
Eric Halbur 200 hours
Brad Retterath 192 hours
Total estimated effort 767 hours
Client Faculty Advisor Technical
Advisor Team Members
Eric Halbur Dr. Randall Geiger LTC
Marvin Meek Jenny Custer Electrical
Engineering ehalbur_at_iastate.edu rlgeiger_at_iastat
e.edu ltcmeek_at_iastate.edu Danielle
Frey Computer Engineering 135 Oriole St 351
Durham 132 Armory Eric
Halbur Computer Engineering Ames, IA
50010 Ames, IA 50011 Ames, IA
50011 Brad Retterath Electrical Engineering
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