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The sensor clamp is put in a box to avoid daylight coming into the photocell and bringing unwanted resistance values into the circuit. | The sensor clamp is put in a box to avoid daylight coming into the photocell and bringing unwanted resistance values into the circuit. | ||
Breadboard Sketch: | Breadboard Sketch (5V Arduino resistance values): | ||
[[Image:sketch_matrix_pulse_meter.jpg]] | [[Image:sketch_matrix_pulse_meter.jpg]] | ||