(Project on hold as of 1/5/18)

• Paper: ​http://ohm.bu.edu/~hazen/LedArray/LED%20array%20and%20controller.pdf

My name is Mikel Garcia-Marcos and I am an Associate Professor of
Biochemistry at the medical campus. I am writing to inquire about a
possible project. I would like to recreate something identical or very
similar to what is described in the attached manuscript (scroll down
to "Support Protocol 1: Construction of programmable LED light device"
on page 10 and the related Figure 2 on page 27).


Basically, I would like to build an array of LED lights that fits the
dimensions of a small plate used for culturing cells and that can be
controlled in terms of intensity and duration of "on" and "off"
cycles.

Parts cost / sourcing

Qty	Item	Price Ea	Total	Link
1	Arduino Uno	$22.00	$22.00
1	SainSmart LCD / keypad shield	$11.00	$11.00	​link
1	BuckBlock Luxdrive LED driver	$18.00	$18.00	​link
12	470nm LED module	$6.00	$72.00	​link
1	Power supply 15V 1.5A	$18.00	$18.00	​link e.g.
3	TIP120 darlington	$0.85	$2.50	​link e.g.
1	Other misc parts	$10.00	$10.00
1	Custom PC board	$100.00	$100.00	ExpressPCB Miniboard (lot of 3)
	Total (est)		$250.00

Reference

• Heatsinks: ​https://www.luxeonstar.com/130mm-x-70mm-1.5-degree-cw-alpha-heat-sink
• Thermalloy: ​https://www.digikey.com/product-detail/en/aavid-thermalloy/645002F00000G/HS509-ND/6558793
• Trays: ​https://mx.vwr.com/assetsvc/asset/es_MX/id/7830342/contents

The original Arduino software uses analogWrite() to set the intensity. This is implemented using PWM on the Arduino at 490 or 980 Hz depending on the pins. 6 pins are available so 6 LED groups can be controlled independently (with modifications to the software which currently supports only 3 channels)

A mystery is that in the original design one LED controller is apparently shared by 3 groups of 12 LEDs. Perhaps only one group is ever on at once? Need to discuss with the customer.