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My project is to use the Raspberry Pi to send data to Arduino, and the data will be sent from the Raspberry Pi most likely through the serial port to pin 8 & 10 of the GPIO pins. Then that data will be sent to Arduino.

How do I send the data from the Raspberry Pi to the Arduino, and how do I know that the data is stored in the Raspberry Pi?

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Do you mean the data will be sent TO the Pi through the serial port on pins 8 & 10? If so, there's another component you omitted - PC perhaps. Please review your question and make sure we can understand from it what you want to do. – Mark Smith Mar 30 at 6:16

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