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To detect a ball or other object, one can use a photogate, consisting of an IR LED to generate light, and an IR Photodiode to detect the presence of an obstruction.
To detect a ball or other object, one can use a photogate, consisting of an IR LED to generate light, and an IR Photodiode to detect the presence of an obstruction.
When the light is blocked by the ball, even for a short time, this creates a signal that can be detected by the Microbit.
When the light is blocked by the ball, even for a short time, this creates a signal that can be detected by the Microbit.
The Photodiode is reversed -biased. When it detects IR light from the LED, it conducts in the reverse direction. When the light is blocked, the voltage changes, creating a signal.
The Photodiode is reversed -biased. When it detects IR light from the LED, it conducts in the reverse direction. When the light is blocked, the voltage changes, creating a signal.
diode circuit.pdfdiodelayout.pdf
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