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Update README.md
Add note on DIO0 being interrupt capable.
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@ -25,7 +25,7 @@ An [Arduino](http://arduino.cc/) library for sending and receiving data using [L
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`NSS`, `NRESET`, and `DIO0` pins can be changed by using `LoRa.setPins(ss, reset, dio0)`. `DIO0` pin is optional, it is only needed for receive callback mode.
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`NSS`, `NRESET`, and `DIO0` pins can be changed by using `LoRa.setPins(ss, reset, dio0)`. `DIO0` pin is optional, it is only needed for receive callback mode. If `DIO0` pin is used, it **must** be interrupt capable via [`attachInterrupt(...)`](https://www.arduino.cc/en/Reference/AttachInterrupt).
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## Installation
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## Installation
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