Jonty , did you find solution to trig your s110 ? I try like mapir solution but it doesnt work usb cable red on pin19 and black on gnd3 , i check i have 0.6v at 1000pwm and 0.9v at 2000pwm Rch7 shutter and i try whith 20000pwm i have 3.3v .ok i think i need spakfun converter to put 5v because...