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Buy from Amazon $20.62$0.84 $22.50 $16.88 $11.25 $5.63 Dec Mar Jun Sep Dec Mar Jun Sep Dec Mar Jun 2014 2015 2016 $17.77, Sep 19 2:14 pm$19.38, Nov 20 - Dec 7$15.15, Dec 9 8:37 pm$16.13, Dec 11 11:28 pm$19.38, Dec 14 - Dec 20$19.57, Dec 23 - Jan 1$19.37, Jan 3 5:29 am$16.26, Jan 4 - Jan 8$16.09, Jan 9 - Jan 22$16.17, Jan 23 - Feb 7$15.92, Feb 8 - Mar 7$16.00, Mar 7 - Jun 27$16.00, Mar 7 - Jun 27$15.91, May 3 - May 29$4.84, May 4 - May 5$16.00, Mar 7 - Jun 27$15.91, May 3 - May 29$11.50, May 5 - May 12$16.00, Mar 7 - Jun 27$15.91, May 3 - May 29$10.09, May 12 - May 14$16.00, Mar 7 - Jun 27$15.91, May 3 - May 29$10.08, May 16 4:09 pm$16.00, Mar 7 - Jun 27$15.91, May 3 - May 29$4.84, May 19 - May 20$16.00, Mar 7 - Jun 27$15.91, May 3 - May 29$4.75, May 22 4:58 pm$16.00, Mar 7 - Jun 27$15.91, May 3 - May 29$0.84, May 24 - May 28$16.00, Mar 7 - Jun 27$15.91, May 3 - May 29$11.20, May 29 1:09 am$16.00, Mar 7 - Jun 27$12.00, May 30 - Jun 5$11.20, May 31 - Jun 15$16.00, Mar 7 - Jun 27$15.91, Jun 7 - Jun 25$11.20, May 31 - Jun 15$16.00, Mar 7 - Jun 27$15.91, Jun 7 - Jun 25$13.84, Jun 16 - Jun 21$20.62, Jun 22 - Jun 25$16.00, Mar 7 - Jun 27$15.91, Jun 7 - Jun 25$16.00, Mar 7 - Jun 27$13.86, Jun 25 - Jun 27$12.01, Jun 25 - Jun 27$19.42, Jun 28 - Jul 1$18.22, Jun 28 - Jul 26$14.23, Jun 28 - Jul 1$18.22, Jun 28 - Jul 26$14.23, Jul 2 8:47 pm$14.22, Jul 2 - Jul 27$18.22, Jun 28 - Jul 26$14.22, Jul 4 - Jul 11$14.22, Jul 2 - Jul 27$18.22, Jun 28 - Jul 26$14.22, Jul 2 - Jul 27$13.22, Jul 12 - Aug 17$18.67, Jul 27 - Jul 30$14.67, Jul 28 - Jul 29$13.22, Jul 12 - Aug 17$18.67, Jul 27 - Jul 30$13.22, Jul 12 - Aug 17$13.21, Jul 30 6:26 pm$19.13, Jul 31 - Aug 4$15.13, Jul 31 - Aug 4$13.22, Jul 12 - Aug 17$19.60, Aug 5 - Aug 10$15.60, Aug 5 - Aug 10$13.22, Jul 12 - Aug 17$20.09, Aug 11 - Aug 17$15.90, Aug 11 - Sep 4$13.22, Jul 12 - Aug 17$20.48, Aug 18 - Oct 6$15.90, Aug 11 - Sep 4$10.96, Aug 18 - Sep 11$20.48, Aug 18 - Oct 6$15.85, Sep 6 8:23 pm$10.96, Aug 18 - Sep 11$20.48, Aug 18 - Oct 6$15.90, Sep 9 - Oct 5$10.96, Aug 18 - Sep 11$20.48, Aug 18 - Oct 6$15.90, Sep 13 - Oct 10$15.90, Sep 9 - Oct 5$20.48, Oct 8 9:29 am$16.48, Oct 8 9:29 am$15.90, Sep 13 - Oct 10$19.76, Oct 9 - Oct 12$15.90, Sep 13 - Oct 10$15.76, Oct 9 - Oct 13$20.48, Oct 13 - Apr 24$15.76, Oct 11 - Oct 30$15.76, Oct 9 - Oct 13$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$15.76, Oct 11 - Oct 30$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$15.73, Nov 5 11:23 am$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$15.53, Nov 11 5:50 pm$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$15.25, Nov 16 3:07 pm$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$15.10, Nov 19 7:31 pm$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$15.07, Nov 20 10:19 pm$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$14.96, Nov 24 1:40 pm$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$14.88, Nov 27 3:48 pm$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$14.82, Nov 29 3:38 pm$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$14.74, Dec 2 3:54 pm$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$14.68, Dec 4 4:19 pm$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$14.59, Dec 7 3:33 pm$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$14.55, Dec 8 5:34 pm$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$14.47, Dec 11 11:40 pm$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$14.38, Dec 14 11:44 pm$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$14.32, Dec 17 1:14 am$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$14.29, Dec 18 1:25 am$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$14.24, Dec 20 8:43 pm$20.48, Oct 13 - Apr 24$16.48, Dec 29 11:58 am$16.48, Oct 15 - Jan 13$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$16.46, Dec 31 3:50 am$20.48, Oct 13 - Apr 24$16.48, Oct 15 - Jan 13$16.37, Jan 1 7:34 pm$20.48, Oct 13 - Apr 24$16.43, Jan 14 2:07 am$13.60, Jan 14 2:07 am$20.48, Oct 13 - Apr 24$16.39, Jan 14 11:19 pm$13.57, Jan 14 11:19 pm$20.48, Oct 13 - Apr 24$16.20, Jan 18 6:42 am$13.40, Jan 18 6:42 am$20.48, Oct 13 - Apr 24$16.15, Jan 19 11:52 pm$13.31, Jan 19 11:52 pm$20.48, Oct 13 - Apr 24$16.00, Jan 23 5:04 am$13.02, Jan 23 5:04 am$20.48, Oct 13 - Apr 24$15.85, Jan 26 11:49 am$12.78, Jan 26 11:49 am$20.48, Oct 13 - Apr 24$15.79, Jan 28 6:46 am$13.94, Jan 28 6:46 am$20.48, Oct 13 - Apr 24$15.69, Jan 30 11:45 pm$12.51, Jan 30 - Feb 1$20.48, Oct 13 - Apr 24$15.61, Feb 1 6:41 pm$12.51, Jan 30 - Feb 1$20.48, Oct 13 - Apr 24$15.50, Feb 5 8:20 am$13.94, Feb 3 - Feb 7$20.48, Oct 13 - Apr 24$15.41, Feb 7 4:36 am$13.94, Feb 3 - Feb 7$20.48, Oct 13 - Apr 24$15.33, Feb 9 10:28 pm$14.00, Feb 9 - Feb 20$20.48, Oct 13 - Apr 24$15.19, Feb 12 4:07 pm$14.00, Feb 9 - Feb 20$20.48, Oct 13 - Apr 24$15.12, Feb 14 12:42 pm$14.00, Feb 9 - Feb 20$20.48, Oct 13 - Apr 24$15.06, Feb 16 8:56 am$14.00, Feb 9 - Feb 20$20.48, Oct 13 - Apr 24$14.92, Feb 20 4:32 am$14.00, Feb 9 - Feb 20$20.48, Oct 13 - Apr 24$14.86, Feb 22 2:28 am$11.00, Feb 22 2:28 am$20.48, Oct 13 - Apr 24$14.81, Feb 24 12:54 am$14.00, Feb 24 - Mar 15$20.48, Oct 13 - Apr 24$14.75, Feb 26 11:46 pm$14.00, Feb 24 - Mar 15$20.48, Oct 13 - Apr 24$14.67, Feb 28 9:06 pm$14.00, Feb 24 - Mar 15$20.48, Oct 13 - Apr 24$14.57, Mar 3 9:24 am$14.00, Feb 24 - Mar 15$20.48, Oct 13 - Apr 24$14.43, Mar 6 11:07 am$14.00, Feb 24 - Mar 15$20.48, Oct 13 - Apr 24$14.33, Mar 9 11:06 am$14.00, Feb 24 - Mar 15$20.48, Oct 13 - Apr 24$14.25, Mar 11 6:52 pm$14.00, Feb 24 - Mar 15$20.48, Oct 13 - Apr 24$14.11, Mar 14 3:31 am$14.00, Feb 24 - Mar 15$20.48, Oct 13 - Apr 24$14.06, Mar 15 7:37 am$14.00, Feb 24 - Mar 15$20.48, Oct 13 - Apr 24$14.31, Mar 17 7:23 pm$13.98, Mar 17 7:23 pm$20.48, Oct 13 - Apr 24$13.87, Mar 20 4:01 am$10.45, Mar 20 - Mar 22$20.48, Oct 13 - Apr 24$16.48, Mar 22 - Apr 7$10.45, Mar 20 - Mar 22$20.48, Oct 13 - Apr 24$16.48, Mar 22 - Apr 7$14.02, Mar 27 4:29 am$20.48, Oct 13 - Apr 24$16.48, Mar 22 - Apr 7$16.47, Mar 28 8:51 am$20.48, Oct 13 - Apr 24$16.48, Mar 22 - Apr 7$14.02, Mar 30 - Mar 31$20.48, Oct 13 - Apr 24$20.44, Apr 3 5:24 pm$16.48, Mar 22 - Apr 7$20.51, Apr 5 1:23 am$20.48, Oct 13 - Apr 24$16.48, Mar 22 - Apr 7$20.48, Oct 13 - Apr 24$20.47, Apr 7 - Apr 24$16.48, Mar 22 - Apr 7$20.48, Oct 13 - Apr 24$20.47, Apr 7 - Apr 24$16.46, Apr 10 9:09 am$20.48, Oct 13 - Apr 24$20.47, Apr 7 - Apr 24$16.34, Apr 13 5:59 am$20.48, Oct 13 - Apr 24$20.47, Apr 7 - Apr 24$16.24, Apr 16 2:10 am$20.48, Oct 13 - Apr 24$20.47, Apr 7 - Apr 24$16.19, Apr 17 10:35 am$20.48, Oct 13 - Apr 24$20.47, Apr 7 - Apr 24$16.15, Apr 18 5:49 pm$20.48, Apr 27 - Jun 26$20.47, Apr 27 - Apr 28$16.14, Apr 27 - Apr 28$20.48, Apr 27 - Jun 26$16.48, May 1 - May 4$16.48, May 1 - Jun 26$20.48, Apr 27 - Jun 26$16.48, May 1 - Jun 26$16.16, May 7 8:35 am$20.48, Apr 27 - Jun 26$16.48, May 1 - Jun 26$15.68, May 11 5:28 am$20.48, Apr 27 - Jun 26$16.48, May 1 - Jun 26$15.06, May 14 11:37 am$20.48, Apr 27 - Jun 26$16.48, May 1 - Jun 26$13.82, May 18 1:48 pm$20.48, Apr 27 - Jun 26$16.48, May 1 - Jun 26$12.25, May 22 6:49 pm$20.48, Apr 27 - Jun 26$16.48, May 1 - Jun 26$9.00, May 27 - Jun 5$20.48, Apr 27 - Jun 26$16.48, May 1 - Jun 26$9.64, Jun 9 - Jun 15$20.48, Apr 27 - Jun 26$16.48, May 1 - Jun 26$16.47, Jun 17 8:50 am$20.48, Apr 27 - Jun 26$16.48, May 1 - Jun 26$14.00, Jun 21 4:25 am$20.48, Apr 27 - Jun 26$16.48, May 1 - Jun 26$10.98, Jun 23 2:15 am$20.48, Apr 27 - Jun 26$16.48, May 1 - Jun 26$10.79, Jun 26 9:37 pm$20.06, Jun 30 - Jul 3$16.06, Jun 30 - Jul 3$10.60, Jun 30 10:49 pm$20.06, Jun 30 - Jul 3$16.06, Jun 30 - Jul 3$10.52, Jul 3 1:10 am$19.05, Jul 7 - Jul 12$15.05, Jul 7 - Jul 12$10.39, Jul 7 7:34 am$19.05, Jul 7 - Jul 12$15.05, Jul 7 - Jul 12$10.29, Jul 10 3:43 am$19.05, Jul 7 - Jul 12$15.05, Jul 7 - Jul 12$10.22, Jul 12 9:51 pm$19.04, Jul 14 - Jul 22$15.04, Jul 14 - Jul 22$10.06, Jul 16 5:31 pm$19.04, Jul 14 - Jul 22$15.04, Jul 14 - Jul 22$9.99, Jul 18 1:24 pm$19.04, Jul 14 - Jul 22$15.04, Jul 14 - Jul 22$14.00, Jul 22 4:58 am$18.94, Jul 25 6:32 pm$14.99, Jul 25 - Aug 3$14.94, Jul 25 6:32 pm$18.60, Jul 29 - Jul 31$14.99, Jul 25 - Aug 3$14.60, Jul 29 - Jul 31$17.61, Aug 3 - Aug 7$14.99, Jul 25 - Aug 3$13.61, Aug 3 - Aug 11$17.61, Aug 3 - Aug 7$13.61, Aug 3 - Aug 11$12.00, Aug 7 - Aug 11$17.52, Aug 11 - Aug 18$13.61, Aug 3 - Aug 11$12.00, Aug 7 - Aug 11$17.52, Aug 11 - Aug 18$13.52, Aug 15 - Aug 20$11.99, Aug 15 1:38 am$17.43, Aug 20 - Aug 26$13.52, Aug 15 - Aug 20$11.98, Aug 20 5:14 pm$17.43, Aug 20 - Aug 26$13.43, Aug 24 - Aug 26$11.47, Aug 24 10:25 am$17.43, Aug 20 - Aug 26$13.43, Aug 24 - Aug 26$11.50, Aug 26 8:28 am$17.34, Aug 30 - Sep 6$13.34, Aug 30 - Sep 6$10.93, Aug 30 2:48 am$17.34, Aug 30 - Sep 6$13.34, Aug 30 - Sep 6$10.54, Aug 31 11:52 pm$17.34, Aug 30 - Sep 6$13.34, Aug 30 - Sep 6$10.13, Sep 4 8:36 pm$17.34, Aug 30 - Sep 6$13.34, Aug 30 - Sep 6$11.98, Sep 6 - Sep 10$17.25, Sep 10 - Sep 12$13.25, Sep 10 - Sep 16$11.98, Sep 6 - Sep 10$17.25, Sep 10 - Sep 12$13.25, Sep 10 - Sep 16$11.97, Sep 12 5:18 pm$16.38, Sep 16 - Sep 20$13.25, Sep 10 - Sep 16$11.92, Sep 16 2:20 pm$16.38, Sep 16 - Sep 20$12.38, Sep 20 11:05 am$11.87, Sep 20 11:05 am$15.56, Sep 24 6:46 am$11.56, Sep 24 - Oct 6$11.53, Sep 24 6:46 am$15.99, Sep 26 - Oct 4$11.56, Sep 24 - Oct 6$11.49, Sep 26 - Sep 28$15.99, Sep 26 - Oct 4$12.00, Sep 30 - Oct 2$11.56, Sep 24 - Oct 6$15.99, Sep 26 - Oct 4$14.00, Oct 4 - Oct 6$11.56, Sep 24 - Oct 6$19.88, Oct 6 - Oct 10$14.00, Oct 4 - Oct 6$11.56, Sep 24 - Oct 6$19.88, Oct 6 - Oct 10$17.95, Oct 10 - Dec 24$12.00, Oct 10 - Oct 14$19.54, Oct 12 - Oct 14$17.95, Oct 10 - Dec 24$12.00, Oct 10 - Oct 14$19.44, Oct 16 - Oct 28$17.95, Oct 10 - Dec 24$11.98, Oct 16 5:25 pm$19.44, Oct 16 - Oct 28$17.95, Oct 10 - Dec 24$11.96, Oct 18 4:07 pm$19.44, Oct 16 - Oct 28$17.95, Oct 10 - Dec 24$11.94, Oct 20 3:30 pm$19.44, Oct 16 - Oct 28$17.95, Oct 10 - Dec 24$11.98, Oct 24 11:58 am$19.44, Oct 16 - Oct 28$17.95, Oct 10 - Dec 24$11.95, Oct 28 10:17 am$19.34, Nov 1 - Nov 18$17.95, Oct 10 - Dec 24$11.92, Nov 1 9:22 am$19.34, Nov 1 - Nov 18$17.95, Oct 10 - Dec 24$11.88, Nov 5 11:17 am$19.34, Nov 1 - Nov 18$17.95, Oct 10 - Dec 24$11.85, Nov 7 1:37 pm$19.34, Nov 1 - Nov 18$17.95, Oct 10 - Dec 24$11.87, Nov 9 3:53 pm$19.34, Nov 1 - Nov 18$17.95, Oct 10 - Dec 24$9.99, Nov 13 - Dec 14$19.24, Nov 22 - Dec 14$17.95, Oct 10 - Dec 24$9.99, Nov 13 - Dec 14$18.37, Dec 19 - Dec 24$17.95, Oct 10 - Dec 24$14.00, Dec 19 - Jan 3$17.95, Oct 10 - Dec 24$17.45, Dec 29 10:01 am$14.00, Dec 19 - Jan 3$17.95, Oct 10 - Dec 24$16.57, Jan 3 5:05 am$14.00, Dec 19 - Jan 3$17.95, Oct 10 - Dec 24$15.74, Jan 8 - Jan 13$13.97, Jan 8 2:37 am$17.95, Oct 10 - Dec 24$15.74, Jan 8 - Jan 13$12.47, Jan 13 12:58 am$17.95, Oct 10 - Dec 24$15.31, Jan 15 - Feb 28$12.45, Jan 15 - Jan 23$17.95, Oct 10 - Dec 24$15.31, Jan 15 - Feb 28$10.96, Jan 28 5:14 am$15.31, Jan 15 - Feb 28$11.32, Feb 2 - Feb 28$10.93, Feb 2 - Feb 7$15.31, Jan 15 - Feb 28$11.32, Feb 2 - Feb 28$9.85, Feb 12 - Feb 20$15.31, Jan 15 - Feb 28$11.32, Feb 2 - Feb 28$8.87, Feb 26 - Feb 28$19.21, Mar 12 - Mar 18$11.30, Mar 12 - Apr 22$6.46, Mar 12 4:49 pm$19.21, Mar 12 - Mar 18$11.30, Mar 12 - Apr 22$5.81, Mar 18 11:57 am$15.99, Mar 30 - Apr 22$11.30, Mar 12 - Apr 22$9.94, Mar 30 12:47 am$15.99, Mar 30 - Apr 22$11.30, Mar 12 - Apr 22$9.49, Apr 10 9:36 am$15.99, Mar 30 - Apr 22$11.30, Mar 12 - Apr 22$8.55, Apr 22 6:20 am 22,391748,313 625,000 468,750 312,500 156,250 Oct Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun 2015 2016

Price Details

New

Latest $15.99 3 hrs ago
Highest $20.48 Apr 27, '15
Lowest $15.15 Dec 9, '13
Average $15.99 (30d avg)
$16.23 (90d avg)
$17.28 (180d avg)
$18.13 (365d avg)
$18.40 (Lifetime average)
Added Sep 19, 2013

3rd Party New

Latest $11.30 3 hrs ago
Highest $17.95 Oct 10, '15
Lowest $11.30 Mar 12, '16
Average $11.30 (30d avg)
$11.31 (90d avg)
$15.00 (180d avg)
$15.02 (365d avg)
$15.33 (Lifetime average)
Added Sep 19, 2013

3rd Party Used

Latest $8.55 3 hrs ago
Highest $20.62 Jun 22, '14
Lowest $0.84 May 24, '14
Average $9.71 (30d avg)
$9.05 (90d avg)
$10.48 (180d avg)
$11.54 (365d avg)
$12.73 (Lifetime average)
Added Sep 19, 2013

Sales Rank

30 day average: 185,311
90 day average: 291,094

Product Description

is about design that works. Its about building with LEGO MINDSTORMS NXT for fun, for education, but especially for competition. Author James Trobaugh is an experienced coach and leader in the FIRST LEGO League. In this book, he shares his hard-won knowledge about design principles and techniques that contribute to success in robotics competitions. unlocks the secrets of reliable design using LEGO MINDSTORMS NXT. Youll learn proven design patterns that you can employ for common tasks such as turning, pushing, and pulling. Youll reduce and compensate for variation in performance from battery charge levels and motor calibration differences. Youll produce designs that wont frustrate you by not working, but that will delight you with their reliable performance in the heat of competition. Good design is about more than just the hardware. Software counts for a lot, and has you covered. Youll find chapters on program design and organization with tips on effective coding and documentation practices. Youll learn about master programs and the needed flexibility they provide. Theres even a section on presenting your robot and software designs to the judges. is the book you need if your involved in competitions such as FIRST LEGO League events. Whether coach, parent, or student, youll find much in this book to make your design and competition experience fun and memorable, and educational.Please note: the print version of this title is black & white; the eBook is full color.

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