Above the pin definitions you should see:
SoftwareSerial BTserial(14, 15); // RX, TX
These are the pins used for the connection to the Bluetooth module. Pins 14 and 15 are AKA A0 and A1. Even if you do not use a Bluetooth module you should either:
– not use these pins, or
– move them to pins you are not using.
Canon trigger. On my Canon, bulb only works if you activate both focus and shutter. I would recommend connecting the focus pin even if you don’t want to use it.
This reply was modified 1 year, 7 months ago by Martyn.