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HI,I am having an issue with running pinewood derby timer outside with excess ambient light as well. I have implemented the suggestion regarding the placement of the detector. I need some clarification on the pinewood calibrate sketch. Do I upload and run the calibrate sketch, then when finished re upload the timer sketch? I am using the LED/phototransistor from miscjunk. Definatley had issues running the derby for the 4-H filed day event that was outside at the Paso Robles fair grounds.Thanks