A digital f-stop timer for photographic enlargers using a Raspberry Pico W
DisparaTimer is an app capable of controlling the exposure of a photo enlarger using a Raspberry Pico W/WH and a power relay. The physical installation is cheap and easy, check please https://www.disparafilm.com/disparatimer-en website for additional information and multimedia resources.
DisparaTimer has two operational modes, "TIMER" and "STRIP". The first one is the traditional timer mode, where you set a time to be used during exposure. The second one is to perform test strips with constant increments of fraction of f-stop over a base time.
An Android 8 device is needed, even Android 9 or higher is recommended. Aspect is optimum with screens of size between 5 and 10 inches and a minimum resolution of 1280x720. In case of bad aspect, modify the screen zoom within the phone or tablet settings to improve it.
