Initial commit

Signed-off-by: Hauke Mönck <moenck@zedat.fu-berlin.de>

README.md

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+# bb_irflash - Infrared LED flashing software and hardware
+
+----
+## What is bb_irflash?
+
+bb_irflash is a software and hardware layout package. It contains the circuit and board layout for creating infrared flashing devices.
+
+## Software
+
+The software is C code written and tested for the Arduino Board Duemilanove. However, it should be easily adjusted to fit any arduino available on the market.
+
+## Hardware
+
+The hardware is designed to be triggered via signal current and powered with 12V. The design contains no protection mechanism whatsoever. So exchanging the resistors and/or LED's enables faster/slower flashing or constant lighting. 
+
+The board dimensions are 23mmx51mm, single sided layout. Parts as described in the 'Parts' section enable flashing at 3 Hz and 20 ms duration. Designs come in EAGLE format.
+
+## Parts
+The SMD parts required for the boards are the following.
+
+2x [MOSFET 'AO4752'](http://www.digikey.com/product-detail/en/alpha-omega-semiconductor-inc/AO4752/785-1597-1-ND/3712546)
+
+2x [LED OSRAM 'SFH-4716S'](http://www.digikey.com/product-detail/en/osram-opto-semiconductors-inc/SFH-4716S/475-3045-1-ND/4360722)
+
+1x [Signal Amplifier 'LM358DT'](http://www.digikey.com/product-detail/en/stmicroelectronics/LM358DT/497-1591-1-ND/592083) 
+
+8x [2.2Ohm Resistor 'CRM2512-JW-2R2ELF'](http://www.digikey.com/product-detail/en/bourns-inc/CRM2512-JW-2R2ELF/CRM2512-JW-2R2ELFCT-ND/3592989) 
+
+3x [10kOhm Resistor 'RC0603JR-0710KL'](http://www.digikey.com/product-detail/en/yageo/RC0603JR-0710KL/311-10KGRCT-ND/729647) 
+
+1x [120Ohm Resistor 'RC0603JR-07120RL'](http://www.digikey.com/product-detail/en/yageo/RC0603JR-07120RL/311-120GRCT-ND/729653) 
+
+4x [2.2mF Capacitor 'JMK107BJ225KA-T'](http://www.digikey.com/product-detail/en/taiyo-yuden/JMK107BJ225KA-T/587-1254-1-ND/931031) 
+

arduino/trigger.c

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+
+#define CamPinA           3
+#define CamPinB           9
+#define LEDPinA1          5
+#define LEDPinA2          6
+#define LEDPinB1          10
+#define LEDPinB2          11
+#define FPS               3
+//Flashing time is flash+camFlashOffset+Trigertime
+//Workflow: Flash on -> wait the offset -> trigger cam -> wait triggertime
+//          -> untrigger cam -> wait flash -> Flash off 
+#define flash             75
+#define second            1000
+
+// the setup function runs once when you press reset or power the board
+void setup() {
+  pinMode(CamPinA, OUTPUT);
+  pinMode(CamPinB, OUTPUT);
+  pinMode(LEDPinA1, OUTPUT);
+  pinMode(LEDPinB1, OUTPUT);
+  pinMode(LEDPinA2, OUTPUT);
+  pinMode(LEDPinB2, OUTPUT);
+}
+
+void triggerDual(int portCam, int portLED, int portLED2){
+  analogWrite(portCam,255);
+  delay(5);
+  analogWrite(portCam,0);
+
+  delay(50);
+
+  analogWrite(portLED,255);  
+  analogWrite(portLED2,255);  
+  delay(20);
+  analogWrite(portLED,0);
+  analogWrite(portLED2,0);
+}
+
+// the loop function runs over and over again forever
+void loop() {  
+
+  //E.g. we have two fps: flash at 0 cam A, 250 cam B, 500 cam A ...
+  int halfFlash = second/FPS/2-flash;
+
+  int i=0;
+  for(i=0 ; i<FPS ; i++){
+
+    //LED for debug
+    digitalWrite(13, HIGH);
+
+    //flash camera A and wait half a frame
+    triggerDual(CamPinA,LEDPinA1,LEDPinA2); 
+    digitalWrite(13, LOW);
+    delay(halfFlash);
+    triggerDual(CamPinB,LEDPinB1,LEDPinB2); 
+    delay(halfFlash);
+  }
+}
+
+