Spark-bouncer - Cloud+RFID based door access control - configure rules via cloud calls, handle >3000 keys on flash storage, live logging via publish, RFID OTP read/write/compares, bling!

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If you read this post there seem to be some sugestions

In short, you might try an A pin rather than a D.
I only browsed over the thread and haven't tested it, but it might still be worth a try.

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