Changes between Initial Version and Version 1 of LED_Dimmer

Timestamp:

Nov 8, 2013, 10:17:53 AM (10 years ago)

Author:

Eric Hazen

Comment:

--

LED_Dimmer

@@ +1 @@
+=== PWM Dimmer ===
+
+This board will provide I2C intensity control for a Luxeon white LED.
+Three control options are provided:
+
+ 
+analog input of BuckPuck
+ 
+input of BuckPuck
+ 
+(not constant current... 12V supply with limit resistor)
+
+==== PCB Documentation ====
+
+* [http://joule.bu.edu/~hazen/LED_dimmer/dimmer_pcb_legend.pdf Layout]
+* [http://joule.bu.edu/~hazen/LED_dimmer/dimmer_sch_upd.pdf Schematic]
+* [http://joule.bu.edu/~hazen/LED_dimmer/dimmer_ExpressPCB.zip PCB Design]
+[http://www.expresspcb.com ExpressPCB]
+* Assembly Notes:
+ * Buckpuck mounts on bottom side of PCB (oops)
+ * Cut trace to U3-6, wire to U3-7
+
+==== Programming ====
+
+|| Digital Pot || 50 || fb || 00-3f || Pot 1 setting ||
+|| PWM control || 60 || 01 || 00-ff || PWM 0 blink rate [[(n+1)/152_Hz]]
+||             ||    || 02 || 01-ff || PWM 0 duty cycle [[n/256]]
+||             || 60 || 03 || 00-ff || PWM 1 blink rate [[(n+1)/152_Hz]]
+||             ||    || 04 || 01-ff || PWM 1 duty cycle [[n/256]]
+||             ||    || 05 || 00-0f || Selector: bits 0-1 = white LED; bits 2-3 = red LED ||
+||             ||    ||    ||       ||  00=off 01=on 10=PWM 0 11=PWM 1 ||
+
+==== Parts Documentation ====
+
+* Luxeon LXHL-MW1D High-intenisty LED [http://www.luxeon.com/pdfs/DS23.pdf Data Sheet]
+* Philips PCA9530 2-output I2C PWM Dimmer [http://www.semiconductors.philips.com/pip/PCA9530D.html Data Sheet]
+  [http://joule.bu.edu/~hazen/DataSheets/Philips/PCA9530_2.pdf local copy]
+* DS3906 digital pot 
+([http://joule.bu.edu/~hazen/DataSheets/Dallas/DS3906.pdf Data Sheet]
+([http://www.maxim-ic.com/package_drawings/21-0061I.pdf Package Drawing]
+* [http://www.i2ctools.com I2CTools.com]
+[http://www.i2ctools.com/Downloads/USB-to-I2C_Hardware_User_Manual.pdf Hardware Manual]
+* [http://www.leddynamics.com LED Dynamics] BuckPuck constant-current driver   [http://www.leddynamics.com/LuxDrive/datasheets/3021-BuckPuck.pdf Data Sheet]
+
+
+==== Bit-Bang I2C Interface ====
+
+ 
+  test program
+
+{{{
+                                         LS05 pin 14 (Vcc) o      -------
+                                                           |      |     |
+            +--+--+---------------------+--+--+------------+------+-o 1 |
+            |  |  |                     |  |  |           ===.1uF | +5V |
+  -------- [[R]][[R]][[R]] 3x10K       3x10K [[R]][[R]][[R]]
+  |      |  |  |  |                     |  |  |    pin 7 o-+------+-o 2 |
+  | 12 o-+--+  |  |   3|\ 4             |  |  |    (Gnd)          | GND |
+  | 17 o-+-----|--|----| >o-------------+--|--|--------------+    |     |
+  |      |     |  |    |/        8 /|9     |  |     10 /|11  +----+-o 3 |
+  | 15 o-+-----+--|--------------o< |------+--|------o< |----+    | SCL |
+  |      |        |   1|\ 2        \|         |        \|         |     |
+  |  9 o-+--------|----| >o-------------------+--------------+----+-o 4 |
+  |      |        |    |/                            6 /|5   |    | SDA |
+  | 11 o-+--------+----------------------------------o< |----+    -------
+  | 10 o-+-+                                           \|          4-pin
+  | 13 o-+-+--oGND                                              Connector
+  | 25 o-+-+      ------------------ Part List --------------------------
+  --------        | 1 - .1 uF capacitor   | 6 - 10K 5% resistors        |
+  25-pin male D   | 1 - 4-pin connector   | 1 - 25-pin male D connector |
+  connector to PC | 1 - 74LS05 open collector hex inverter              |
+  printer port    -------------------------------------------------------
+
+}}}
+
+
+