1) have pin9 connected to multiple IR LED Anodes/+ve legs and 2)the Cathodes/-ve legs of the IR LEDs connected to their own individual digital pin, and control each individual IR LED by switching the corresponding pin "HIGH" or "LOW".?
does anyone know how can i use this Open Cct /40 Ohm to easily pick up (differentiate) high/ low on adrino digital input?
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