Darkroom Timer v2.0A for PCB Exposure Box
The improved Darkroom Timer circuit is designed to facilitate precise timing for photographic development processes. The enhancements over the original design include additional timing modes and user interface improvements, which allow for more versatile usage in various darkroom settings.
The schematic diagram illustrates the main components, including a PIC microcontroller that serves as the core processing unit. The microcontroller is programmed to manage the timing functions and user inputs, ensuring precise control over the development process. The circuit includes a display interface, typically an LCD or LED setup, to provide real-time feedback to the user regarding the timing status.
Power regulation components are included to ensure stable operation of the microcontroller and other active components. The PCB layout is optimized for compactness and efficiency, minimizing signal interference and enhancing reliability. The silkscreen layer not only identifies component values but also aids in the assembly process by providing clear labeling of connections and test points.
The availability of the modified source code in ASM and HEX formats allows for further customization and programming flexibility. Users can adapt the firmware to suit specific needs or integrate additional functionalities as required. The use of MPLAB for compiling the code ensures compatibility with a wide range of PIC microcontrollers, making this design accessible to a broad audience of electronics enthusiasts and professionals.
Overall, this enhanced Darkroom Timer offers significant improvements over its predecessor, making it a valuable tool for photographers seeking precision in their development processes.This is an improved version of the Darkroom Timer originally created by Stan Ockers (1999). Some extra features were added and the PIC code was modified accordingly The complete schematic, PCB and silkscreen are available in high resolution pdf format. The component values are clearly indicated on the silkscreen. The modified source code is avail able in asm and hex format (compiled in MPLAB). 🔗 External reference
Related Circuits
This timer was designed primarily to switch off a portable radio after a set period. This feature allows users to fall asleep on the beach or in a hammock, knowing that the receiver will automatically turn off after a...
This mini metronome provides a linearly scaled output with a range of 40 to 208 beats per minute. The transistors Q1 and Q2 facilitate the linear frequency variation of IC1. The described mini metronome circuit utilizes an integrated circuit (IC1)...
This circuit automates the control of street or porch lights. The automatic lamp controller circuit utilizes a 7806 voltage regulator IC, which can be employed to automate street lights, tube lights, or any other home electrical lighting systems. The...
The device is a switch programmable on/off or interval timer that features three relay-switched outputs. Output one activates for the duration of time one, output two activates for the duration of time two, and output three activates for the...
The Programmable Unijunction Transistor (PUT) serves as both a timing element and a sampling oscillator. A low leakage film capacitor is required for capacitor C2 because of the minimal current supplied to it. The Programmable Unijunction Transistor (PUT) is a...
The SC9256 is a phase-locked loop (PLL) integrated circuit designed for digital tuning systems (DTS), featuring built-in 2 modulus prescalers. All functions are controlled through three serial bus lines. These integrated circuits are utilized to configure high-performance digital tuning...