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ESP-Meter
ESP32-C3 exposure helper for analog shooters, a BH1750 lux sensor, rotary encoders, switches, and a low-power OLED in a compact DIY meter.
Background
The ESP-Meter is a personal project for analog photographers who want clearer exposure decisions, especially newcomers balancing shutter speed and aperture. It is built around an ESP32-C3, a BH1750 ambient light sensor, rotary encoders, and switches, with a small OLED readout to keep power draw low.
Calibration
The meter was calibrated and compared against a Sekonic L-308S, a common incident meter priced around $300. In testing, the ESP-Meter tracked within roughly 98% of the Sekonic’s EV readings. Bill of materials lands near $15, on the order of 20× cheaper than the commercial tool, in a smaller package, while remaining accurate enough for everyday film work.