Build your own f-stop timer for developing B&W photos

Photographer and electronics enthusiast Brodie Tyrrell has designed and published complete details for an Arduino-based f-stop timer. This is used when developing black and white photographs – the timer is used to determine the length of exposure which affects the darkness of the image. As the relationship between exposure time and darkness isn’t linear, using the timer makes the process much simpler. Building the timer can be done in two ways, you can have the PCBs made with Brodie’s included design files – or use an LCD Display shield and protoshield for the circuitry. Either way, you can end up with a professional-looking finished product:

For more information including the complete set of design files and code, visit Brodie’s site here. To get started with your own timer, consider our range of Arduino-compatible hardware and protoshields, including the Freetronics Eleven – the Arduino-Uno compatible with low-profile USB socket, onboard prototyping space and easy to view LEDs:

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