(module+ main
(displayln total-cost))
-;; TODO: describe in detail what each field is
+;; the robot is made of a bunch of items, like a screw or a motor.
+
+;; this is a description of items in general.
(struct item
- (description quantity unit-cost max-lead-days where-to-get note))
+ (;; each item has a natural language description what the part is.
+ description
+
+ ;; how many units of this item are on a single robot
+ quantity
+
+ ;; how much does a single unit of these items cost
+ unit-cost
+
+ ;; how many days will it take to get the item
+ max-lead-days
+
+ ;; how to obtain the item
+ where-to-get
+
+ ;; any special notes about the item
+ note))
+
+;; estimate of the cost of pla in dollars per cubic centimeter
+(define pla-$/cm^3
+ ;; this cost is an estimate taken from this site
+ ;; http://www.toybuilderlabs.com/
+ ;; blogs/news/13053117-filament-volume-and-length
+ (/ 25 800))
+
+;; usually, the above code would be enough for describing a bunch of
+;; items. unfortunately, the last argument, for the parameter 'note',
+;; must be supplied in the default item constructor created above.
+;; this constructor below, called 'make-item', allows creating
+;; items without supplying the argument for the parameter 'note'. if
+;; the 'note' argument is not supplied, it will be replaced by the
+;; empty string, "".
(define (make-item
description quantity unit-cost max-lead-days where-to-get
[note ""])
(item description quantity unit-cost max-lead-days where-to-get note))
+
+;; TODO: add sonar sensor cable making supplies
+;; TODO: add actual cost for screws, nuts, and other estimated parts
+;; TODO: add male-female jump wires for connecting sonar sensors
+;; TODO: add ball caster
+;; TODO: checkout the following, if it's not a fraud, buy for next class
+;;; (string-append
+;;; "http://www.ebay.com/itm/UNO-R3-Development-Board-MEGA328P-"
+;;; "ATMEGA16U2-For-Arduino-Compatible-USB-Cable/201090526898")
+;;; only $9.99 for arduino uno r3 + usb!!
(define bill-of-materials
(list
- ;; TODO: add solid core wires
- ;; TODO: add male-female jump wires for connecting sonar sensors
- ;; TODO: add 4x AA batteries
- ;; TODO: add 4x AA battery holder
- ;; TODO: add 3d printer filament cost for wheel, sonar sensor holders,
- ;; caster standoff
- ;; TODO: add ball caster
- ;; TODO: add angle bracket from evil mad science
- (make-item "Arduino(tm) board"
+ ;; the construction of the first item is heavily commented.
+ ;; the higher amount of commenting is intended to make it clear
+ ;; how the code works to new readers
+ (make-item (string-append
+ ;; this is the argument for the parameter 'description'.
+ ;; it's a description of the orange wire. this is for
+ ;; documentation.
+ "solid core orange 22 awg wire, male-male jump wire."
+ " units in mm. makes electrical connection between"
+ " arduino and motor controller, used for backwards"
+ " enabling.")
+
+ ;; this is the argument for the parameter 'quantity'.
+ ;; this is the number of millimeters of orange wire
+ ;; in a single robot kit.
+ ;; there are 2 orange wires, one for each motor.
+ ;; the 120 mm wire reaches to the far side of the
+ ;; motor controller
+ (+ 120 90)
+
+ ;; this is the argument for the parameter 'unit-cost'.
+ ;; the cost on jameco is 7.95 for 100 feet.
+ ;; this calculation converts from dollars per foot to
+ ;; dollars per millimeter.
+ ;; there are 100 feet, 12 inches per foot, 2.54 cm / inch,
+ ;; and 10 mm / cm.
+ ;; the product of all these numbers is the number of
+ ;; millimeters purchased with $7.95
+ (/ 7.95 (* 100 12 2.54 10))
+
+ ;; this is the argument for the parameter 'max-lead-days'.
+ ;; since the part is at jameco, i can pick it up same day.
+ 1
+
+ ;; this is the argument for the parameter 'where-to-get'.
+ ;; it is a url where the part can be purchased.
+ (string-append
+ "http://www.jameco.com/webapp/wcs/stores/servlet/Product"
+ "_10001_10001_2154871_-1"))
+
+ (make-item (string-append
+ "solid core blue 22 awg wire, male-male jump wire."
+ " units in mm. connects motor controller and arduino,"
+ " used for forwards enabling.")
+ (+ 120 90)
+ (/ 7.95 (* 100 12 25.4))
+ 1
+ (string-append
+ "http://www.jameco.com/webapp/wcs/stores/servlet/Product"
+ "_10001_10001_36768_-1"))
+ (make-item (string-append
+ "solid core white 22 awg wire, male-male jump wire."
+ " units in mm. connects motor controller and arduino,"
+ " used for speed signal.")
+ (+ 120 90)
+ ;; cost of 1 mm
+ (/ 7.95 (* 100 12 25.4))
+ 1
+ (string-append
+ "http://www.jameco.com/webapp/wcs/stores/servlet/Product"
+ "_10001_10001_36881_-1")
+ (string-append "unit cost goes down for large orders,"
+ " see page for specifics"))
+ (make-item (string-append
+ "solid core green 22 awg wire, male-male jump wire."
+ " units in mm. connects motor to breadboard.")
+ (* 2 175)
+ (/ 7.95 (* 100 12 25.4))
+ 1
+ (string-append
+ "http://www.jameco.com/webapp/wcs/stores/servlet/Product"
+ "_10001_10001_36822_-1"))
+ (make-item (string-append
+ "solid core yellow 22 awg wire, male-male jump wire."
+ " units in mm. connects motor to breadboard.")
+ (* 2 175)
+ (/ 7.95 (* 100 12 25.4))
+ 1
+ (string-append
+ "http://www.jameco.com/webapp/wcs/stores/servlet/Product"
+ "_10001_10001_36920_-1"))
+ (make-item (string-append
+ "solid core red 22 awg wire, male-male jump wire."
+ " units in mm. connects power for all components.")
+ (+ (* 2 30) 25 25)
+ (/ 7.95 (* 100 12 25.4))
+ 1
+ (string-append
+ "http://www.jameco.com/webapp/wcs/stores/servlet/Product"
+ "_10001_10001_36856_-1"))
+ (make-item (string-append
+ "solid core black 22 awg wire, male-male jump wire."
+ " units in mm. connects ground for all components.")
+ (+ (* 30 2) (* 4 25) 25 55)
+ (/ 7.95 (* 100 12 25.4))
+ 1
+ (string-append
+ "http://www.jameco.com/webapp/wcs/stores/servlet/Product"
+ "_10001_10001_36792_-1"))
+ (make-item "9v battery"
+ 1 1.29 1
+ (string-append
+ "https://www.jameco.com/webapp/wcs/stores/servlet/Product"
+ "_10001_10001_151095_-1")
+ "can get in store")
+ (make-item "9v battery holder"
+ 1 (/ 1.25 10) 1
+ (string-append
+ "http://www.jameco.com/webapp/wcs/stores/servlet/Product"
+ "_10001_10001_2128067_-1")
+ "can get in store")
+ (make-item "AA battery"
+ 4 (/ 17.99 100) 1
+ "http://www.frys.com/product/6292850"
+ "can get in store")
+ (make-item "4xAA battery holder"
+ 1 2.25 1
+ (string-append
+ "http://shop.evilmadscientist.com/"
+ "productsmenu/partsmenu/422")
+ (string-append
+ "can get in store. unit cost goes down for large orders"
+ ", see page for specifics."))
+ (make-item "angle bracket, 1/2 inch sides with #6-32 threaded hole"
+ 4 0.75 1
+ (string-append
+ "http://shop.evilmadscientist.com/productsmenu/partsmenu"
+ "/465-bracket")
+ (string-append
+ "can get in store. unit cost goes down for large orders"
+ ", see page for specifics."))
+ (make-item "Arduino(tm) Uno board"
1 16.98 8
(string-append
- "http://www.colorapples.com/2012-new-arduino-uno-r3-board"
- "-atmega328-with-usb-cable-p-89818.html#.U3Lz5nJKyzA")
- "comes with USB A to B cable")
- (make-item "motor" 2 6 7 "https://solarbotics.com/product/gm3/")
+ "http://www.colorapples.com/2012-new-arduino-uno-r3-boar"
+ "d-atmega328-with-usb-cable-p-89818.html#.U3Lz5nJKyzA")
+ (string-append
+ "comes with USB A to B cable. unit cost goes down for"
+ " large orders, see page for specifics."))
+ (make-item "gm3 motor 224:1 90 degree shaft"
+ 2 6 7
+ "https://solarbotics.com/product/gm3/")
(make-item "transparent 400 point (half) BreadBoard"
1 5.95 1
(string-append
"http://www.jameco.com/webapp/wcs/stores/servlet/"
"Product_10001_10001_2123830_-1"))
(make-item "jumper wire female/male" 1/5 6 2
- (string-append "http://www.nexuscyber.com/"
- "7-premium-40-pin-male-to-female-jumper-wires"))
+ (string-append "http://www.nexuscyber.com/7-premium-40-"
+ "pin-male-to-female-jumper-wires"))
+ (make-item "deck 8x8 inches"
+ 1
+ ;; cost of entire 24x48 inch pegboard is 55.25
+ ;; each deck is only 8x8 inch
+ (/ 55.25 (* (/ 24 8) (/ 48 8)))
+ 1
+ (string-append
+ "http://www.homedepot.com/p/"
+ "Triton-1-4-in-Custom-Painted-Blissful-White-Pegboard"
+ "-Wall-Organizer-Set-of-2-TPB-2W/205192313#specifications"))
(make-item "small squares of double sided tape"
1/30 12 1
(string-append
- "http://www.officedepot.com/"
- "a/products/495242/Scotch-Permanent-Double-Sided-Foam-Tape/"))
+ "http://www.officedepot.com/a/products/495242/"
+ "Scotch-Permanent-Double-Sided-Foam-Tape/"))
;; TODO: get actual cost of #4-40 phillips 1&1/4" screws
- (make-item "#4-40 Phillips 1 1/4 inch screws"
- 3 .1 1
- "olander" "price is an estimate. can pick up in person")
+ (make-item "#4-40 Phillips 1 pan stl zn cr3, magnetic"
+ 4 0.1 1
+ "olander PN:4C100PPMZR"
+ "price is an estimate. can pick up in person")
;; TODO: get actual cost of #4-40 hex lock nuts
(make-item "#4-40 hex lock nuts"
- 6 .1 1
+ 6 0.1 1
"olander" "price is an estimate. can pick up in person")
;; TODO: get actual cost of #6-32 3/8" screws
(make-item "#6-32 button hex head socket 3/8 inch"
- 12 .1 1
+ 12 0.1 1
"olander" "price is an estimate. can pick up in person")
(make-item "motor controller"
1 (/ 5.2 5) 10
"http://www.ebay.com/itm/like/180976411359?lpid=82")
(make-item "sonar sensor hc-sr04"
2 1.39 7
- "http://www.ebay.com/itm/161156018270")))
+ "http://www.ebay.com/itm/161156018270")
+ (make-item "caster standoff"
+ 1 (* 8.2 pla-$/cm^3) 1
+ "3d print at home")
+ (make-item "wheel"
+ 2 (* 11.3 pla-$/cm^3) 1
+ "3d print at home")
+ (make-item "deck holder"
+ 2 (* 4.0 pla-$/cm^3) 1
+ "3d print at home")
+ (make-item "sonar holder"
+ 2 (* 2.4 pla-$/cm^3) 1
+ "3d print at home" "price of filament is an estimate")
+ (make-item "motor mount"
+ 2 (* 3.1 pla-$/cm^3) 1
+ "3d print at home")))
(define total-cost
(apply + (for/list ([thing bill-of-materials])
projects / challenge-bot / blobdiff