majicdesigns / md_multicameraircontrol Goto Github PK

'New' version does not work with Olympus E510/E520 cameras. The reason is 'new' version modulation frequency is too low.
'new' version uses 'wait' procedure trying to create required 38.4kHz modulation:
while (micros() - start <= time) { digitalWrite(_pin, HIGH); wait(pause); digitalWrite(_pin, LOW); wait(pause); }
the 'original' code has this procedure defined as well, but it creates modulation frequency using delayMicroseconds:
while(micros()-start<=time){ digitalWrite(pinLED,HIGH); delayMicroseconds(pause); digitalWrite(pinLED,LOW); delayMicroseconds(pause); }

As a result, single pulse width of the original code is 12us, while the new implementation generates 18us pulses:
'new' code 9ms leading pulse burst:
https://imgur.com/HBk93sM
'original' code leading burst:
https://imgur.com/64HSDvF

for testing purpose I modified MD_multiCameraIrControl.cpp file:

`void cCamera::high(uint32_t time)
{
uint32_t pause = (1000 / _freq / 2) - 4;
uint32_t start = micros();

while (micros() - start <= time)
{
digitalWrite(_pin, HIGH);
// wait(pause);
delayMicroseconds(pause);
digitalWrite(_pin, LOW);
// wait(pause);
delayMicroseconds(pause);
}
}`

After that modification pulse length changed to 12.8us, and now E5.shutterNow() successfully initiates a shot:
https://imgur.com/n1jsBq2