Canon EF User Manual download pdf (Page 29)

Arduino Code

const int HotShoe_Pin = 8;

const int HotShoe_Gnd = 9;

const int LogicVDD_Pin = 10;

const int Cam2Lens_Pin = 11;

const int Clock_Pin = 13;

void setup() // initialization

{

pinMode(HotShoe_Pin, INPUT);

digitalWrite(HotShoe_Pin, HIGH);

pinMode(HotShoe_Gnd, OUTPUT);

digitalWrite(HotShoe_Gnd, LOW);

pinMode(LogicVDD_Pin, OUTPUT);

digitalWrite(LogicVDD_Pin, HIGH);

pinMode(Cam2Lens_Pin, OUTPUT);

pinMode(Clock_Pin, OUTPUT);

digitalWrite(Clock_Pin, HIGH);

delay(100);

send_signal(0x??);

delay(100);

send_signal(0x??);

}

void loop()

{

if(digitalRead(HotShoe_Pin) == LOW) // upon shutter release

{

send_signal(0x??); // move focus to infinity

delay(1000);

send_signal(0x??); // move focus back to nearest

delay(1000);

}

void send_signal(byte signal) // SPI command generator

{

unsigned int i;

for(i = 0; i < 16; i++)

{

digitalWrite(Clock_Pin, i & 1);

if(i % 2 == 0)

{

digitalWrite(Cam2Lens_Pin, (signal >> (i / 2)) & 1);

}

We are asked not to disclose the commands in public.

Please contact me to get the values shown as ??.

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Canon EF User Manual Page 29

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