So, first admission, this doesn’t work yet. In theory everything is perfect, checking the circuit shows the IR LED is firing, the test green LED goes “blip” and the red indicates when the code is off having a kip. However the camera is sat there like a dumb lump ignoring the IR codes through either port (there’s one front and back on the K10D).
Back to pondering on what’s happening, or not happening, whether the IR can fire fast enough or if the IR LED is up to the job or indeed should I find the black chicken to wave over the circuit to finish it off.
Diagram of Pentax IR sequence
The circuit
The Code
/* Pentax firing code (file : blink_test2) Code used with modified setup with parallel LEDs to simulate standard LED and IR LED for triggering K10D camera References: PIR based firing code http://luckylarry.co.uk/arduino-projects/arduino-motion-triggered-camera/ Pentax IR sequence http://www.picbasic.co.uk/forum/showthread.php?t=14182 */ int pinLED = 11; int pinIRLED = 10; // Normally the clock cycle is 38kHz // halfCycle == (26.32×10-6s) / 2 int halfCycle = 13; // the setup routine runs once when you press reset: void setup() { // initialize the digital pin as an output. pinMode(pinIRLED, OUTPUT); pinMode(pinLED, OUTPUT); } // sets the pulse of the IR signal. void pulseON(int pulseTime) { unsigned long endPulse = micros() + pulseTime; // create the microseconds to pulse for while( micros() < endPulse) { digitalWrite(pinIRLED, HIGH); // turn IR on delayMicroseconds( halfCycle ); // half the clock cycle for 38Khz (26.32×10-6s) - e.g. the 'on' part of our wave digitalWrite(pinIRLED, LOW); // turn IR off delayMicroseconds( halfCycle ); // delay for the other half of the cycle to generate wave/ oscillation } } void pulseOFF(unsigned long startDelay) { // startDelay = startDelay * 1000; unsigned long endDelay = micros() + startDelay; // create the microseconds to delay for while(micros() < endDelay); } void takePicture() { // Pentax K10D firing sequence // 13ms pulsing // 3ms silence // 1ms pulse + 1ms silence, looped seven times for (int i=0; i < 2; i++) { // Loop to fire the signal twice, just in case pulseON( 13000 ); // pulse = 13ms pulseOFF( 3000 ); // silence = 1ms // 1 pulseON( 1000 ); // pulse = 1ms pulseOFF( 1000 ); // silence = 1ms // 2 pulseON( 1000 ); // pulse = 1ms pulseOFF( 1000 ); // silence = 1ms // 3 pulseON( 1000 ); // pulse = 1ms pulseOFF( 1000 ); // silence = 1ms // 4 pulseON( 1000 ); // pulse = 1ms pulseOFF( 1000 ); // silence = 1ms // 5 pulseON( 1000 ); // pulse = 1ms pulseOFF( 1000 ); // silence = 1ms // 6 pulseON( 1000 ); // pulse = 1ms pulseOFF( 1000 ); // silence = 1ms // 7 pulseON( 1000 ); // pulse = 1ms pulseOFF( 1000 ); // silence = 1ms // slacking pulseOFF( 1000 ); // silence = 1ms pulseOFF( 1000 ); // silence = 1ms // defined slacking pulseOFF(400000); } } void blink( int thisPIN, int delayMe ) { digitalWrite( thisPIN, HIGH ); // Sleep LED on for (int i=0; i <= delayMe; i++) { delay( 950 ); // 2 seconds twiddling our thumbs digitalWrite( thisPIN, LOW ); // LED off delay( 50 ); digitalWrite( thisPIN, HIGH ); // Sleep LED on } digitalWrite( thisPIN, LOW ); // LED off } void LEDTest() { // Just here to prove the LEDs are up for measurement purposes. digitalWrite( pinIRLED, HIGH ); digitalWrite( pinLED, HIGH ); delay( 5000 ); digitalWrite( pinIRLED, LOW ); digitalWrite( pinLED, LOW ); delay( 2000 ); } void loop() { // LEDTest(); // Click (hopefully) takePicture(); // Make the red LED go blinkitty. blink( pinLED, 5 ); delay( 1000 ); digitalWrite( pinLED, HIGH ); delay( 500 ); digitalWrite( pinLED, LOW ); delay( 1000 ); }