Lumis
Light, Precisely.
A precision metering system for the darkroom enlarger. Powered by ESP32, with a TSL2591 high-dynamic-range light sensor and a BLE companion app.
Spot Metering
Measure up to 8 spots across the projected image
Zone System
Assign each spot to Zones 0–X for precise tonal placement
Exposure Calculation
Automatic exposure time based on paper calibration curves
Split-Grade Printing
Calculates Grade 00 (soft) and Grade 5 (hard) exposure times
Dry-Down Compensation
Highlight-weighted sigmoid correction
16 Paper Profiles
10 factory presets + 6 user-defined
App
Real-time monitoring and remote control via Bluetooth. Zone Map visualization and f-stop fine-tuning.
Design
Enclosure designed in Fusion 360, 3D printed.
Interested? Reach out at cllee112@gmail.com