MQ3 converter

About This Tool

The MQ3 Converter provides a focused solution for electronics developers working with MQ-3 gas sensors. It converts raw electrical measurements into meaningful gas concentration metrics. By computing Rs from Vcc, Vout/ADC, and RL, it then derives Rs/Ro for baseline calibration. When a ppm calibration curve is supplied, the tool performs a log-log interpolation to estimate alcohol concentration in ppm. This enables rapid prototyping, calibration experiments, and comparative testing across sensor batches. The tool supports both ADC-based and voltage-based inputs, and allows optional curve_points input to tailor ppm estimates to a specific sensor or deployment scenario. In practice, users can calibrate Ro in clean air, measure a reading in a known test atmosphere, and obtain an Rs/Ro ratio with an approximate ppm value for monitoring. The approach emphasizes domain accuracy over UI presentation, ensuring researchers and engineers can rely on consistent, repeatable calculations. Use cases include hobbyist microcontroller projects, educational demonstrations, and early-stage sensor evaluations where a quick Rs/Ro and ppm estimate informs design decisions and calibration experiments.

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