Here is the diagram of my Arduino infrared close proximity sensor. As you can see, ... (and hence the brightness level) of IRED1. The infrared receiver IR1 is only sensitive to light modulated with a ...

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This sketch uses a MERG kit 50 block detector to sense the presence of a locomotive on the stretch of track with the level crossing on it. Once it is triggered the bells will sound and the 4 leds will ...