341 Tyler / Weston / Oscar

Here's the circuit, reduced to a 44x55mm quarter-size protoboard from Adafruit. Still powered by AA cells, as I'm waiting on a lithium-polymer battery and some connectors. Still has a bunch of stray wires for the pot, button, solenoid, battery, etc. I'm waiting till' it's mounted in a camera body. I added PWM control of the solenoid to save power by ~75% during long exposures, as well as a second transistor to handle flash sync. The change was made from the comparatively HUGE Arduino UNO to much more svelte Adafruit Trinket. Tried to test shutter speeds the other day using an IR LED and receiver, but I reversed the power leads on the receiver by accident and fried it :< Fritzing: dl.dropboxusercontent.com/u/78151787/Shutter.fzz Parts list: Resistors, 1/4W 100, 1k, 2.2k, 10k TIP120 Darlington high-current transistors (2x) 1N4004 Diode Adafruit Quarter-size Protoboard Adafruit Trinket 5V Sparkfun 5V Solenoid (not shown) Momentary button (not shown) 10k trim pot (not shown) 3mm red LED (not shown) Incoming: 500mA 7.4V LiPo