Buddleia Feb 2013 Christina Chu, www.thinklovecreate.com Tested on a short strand of 25, WS2801 http://www.adafruit.com/products/322 Uses Adafruit WS2801, NewPing sensor library

Tech details: 120 addressable LEDs on a strip with WS2801 ICs 15 Ultrasonic sensors

The 120 LEDs on this strip wrapped around a 10ft tall flower structure called Buddleia The flower structure is split into 15 sectors, each which has a single ultrasonic sensor which acts as the trigger point for the initial point of a an led visual rippling effect.Each sector has 8 LEDS in its region. The starting point will be the middle two leds in every bank of 8 LEDS. For this initial version, and for the purpose of debugging, there will be different color associated with each of the 15 sensors. See array called sensor_colors Future versions can have randomized or specific color sequences as so desired.

Let N = Sonar sensor # from [1 .... 15] Let S = Number of Sectors

Middle Upper LED Trigger point = 8*(N)-4 = S*(N)-Ceiling(S/2) Middle Lower LED Trigger point = 8*(N)-5 = S*(N)-Ceiling(S/2)+1

This means the pulse sequence will initiate at LED's # 19 and 20 and proceed in opposite directions simultaneously: 1) starting from LED # 20 and advancing to the end, LED #120 2) starting from LED # 19 and advance to the opposite end, ending with LED #1

For Now, Strip colors coordinate with the N-1, where N is the sensor number. i.e. If sensor #1 is triggered, then sensor_colors[0] will be used

sensor_colors[0] = 0xFF0000; //Bright Red