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--- 2018_leds [2018/03/01 23:27] – created tell
+++ 2018_leds [2018/03/01 23:35] (current) – tell
@@ Line 11: / Line 11: @@
   * negative for red LEDs
   * negative for green LEDs
+To power them we hook up their common + terminal to +12v power, and then we need to connect zero, one, two, or three of the negative wires to -12v depending on what color we want.
 What we like about these:
@@ Line 22: / Line 24: @@
 ====== The driver board ======
+we found this COTS driver: https://www.amazon.com/gp/product/B01MRQFYJN
+Its features:
+  * four low-side mosfet switches (we only need three, one each Red, Green, and Blue)
+  * screw terminals for power input and each of the four outputs
+  * four RoboRIO-compatible three-pin headers for control input.  Each one has the customary -,+,Signal pins just like pwm and DIO cables.
 ====== Hookup to RoboRIO ======
+We found COTS 3-pin female-to-female cables that fit and worked fine.  I think they may have come with the SPARK motor controllers.  If we hadn't found these, we would have made up cables.
+They're hooked up as:
+  * Red: DIO 7
+  * Green: DIO 8
+  * Blue: DIO 9
+Each color turns on when the DIO is set to output and is outputting a "1".
 ====== Software ======
+Amr, this one's for you.