ESP32 Powers Custom Darkroom Timer

Developing film is a timeless process that offers a unique sense of tranquility. The quiet solitude of the darkroom, working with physical materials and chemicals, provides a welcome contrast to the constant digital stimuli of modern life. While the process itself remains analog, there’s still room for incorporating modern conveniences.

John Jones sought to enhance his darkroom experience by building a custom timer. Dissatisfied with the limitations of his old analog timer, he embarked on a project to create a more versatile and reliable tool. This involved designing a custom PCB, 3D printing a case, and creating a user-friendly control panel that could be operated in low-light conditions.

The heart of the timer is a PCB equipped with an ESP32 development board and an I/O expander. These components connect to the array of LEDs, switches, and buttons on the front panel, enabling the timer to perform various functions. The 3D printed enclosure is designed to seamlessly integrate into John’s existing darkroom setup, with a simple bottom half and a more intricate control panel.

To add a touch of visual appeal and functionality, John employed a clever technique. He used a clear filament to create the top layers of the control panel, effectively integrating a light diffuser. By adding red LEDs, he achieved backlit labels that were both visually striking and easy to read in the dark. This innovative approach demonstrates how modern technology can be combined with traditional processes to create a more enjoyable and efficient experience.

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