| name | dual-led-constant-power |
| description | Calibrate and control a dual LED Arduino UNO modulation setup using YYNMOS MOS switch modules and a Waveshare INA219 Current/Power Monitor HAT. Use when working on DualLampHI-style wiring, I2C monitor detection, PWM upload, CSV/PNG power capture, calibrated LUT constant-power crossfades, flicker reduction, or interpreting per-LED voltage/current/power telemetry. |
Dual LED Constant Power
Use this skill for the two-LED Arduino/MOS/INA219 setup where the goal is smooth spectral modulation while keeping measured total electrical power approximately constant.
Default workflow
- Prefer the calibrated LUT controller over RL or fast feedback.
- Confirm I2C sees the Waveshare monitor at
0x40, 0x41, 0x42, and 0x43.
- Upload
firmware/dual_led_constant_power_lut/dual_led_constant_power_lut.ino.
- Capture with
scripts/capture_dual_led_power_plot.py.
- Inspect the runtime section of the plot, not only the calibration sweeps.
- Commit and push firmware, documentation, and lightweight final measurement outputs when working inside the repo.
Hardware assumptions
Use Arduino UNO with two YYNMOS-1 MOS modules and Waveshare Current/Power Monitor HAT.
Important monitor wiring:
Monitor pin 1 / 3V3 -> Arduino 3.3V
Monitor pin 3 / SDA -> Arduino A4 / SDA
Monitor pin 5 / SCL -> Arduino A5 / SCL
Monitor pin 6 / GND -> Arduino GND
Important logical mapping:
PWM A / Arduino D9 -> logical LED A -> monitor 0x41
PWM B / Arduino D10 -> logical LED B -> monitor 0x40
Commands
arduino-cli board list
arduino-cli compile --fqbn arduino:avr:uno firmware\dual_led_constant_power_lut
arduino-cli upload --fqbn arduino:avr:uno -p COM3 firmware\dual_led_constant_power_lut
python scripts\capture_dual_led_power_plot.py --port COM3 --duration 70 --out-dir measurements
Algorithm preference
Do not use reinforcement learning as the first approach. The system is monotonic enough for calibration:
duty -> measured LED power -> inverse LUT -> target power -> duty
Use fast feedback only for diagnostics. Real-time feedback from raw INA219 values can create visible flicker because the MOS PWM carrier and INA219 conversion timing alias.
Reference
Read references/workflow.md when needing details about the final wiring, data columns, final performance, or troubleshooting.
