Serial. Serial.println(analogValue, HEX) // print as an ASCII-encoded hexadecimal I haven't been able to print out a uint64t either. Unfortunately, the Serial.print won't handle a 64-bit variable. Serial.println(analogValue, DEC) // print as an ASCII-encoded decimal I've read in the Reference section that the DOUBLE data type on the Due is a 64-bit variable. Serial.println(analogValue) // print as an ASCII-encoded decimal Serial.print() Prints data to the serial port as human-readable ASCII text. This data is sent as a byte or series of bytes to send the characters representing the digits of a number use the print() function instead. Wait for a USB serial connection for up to 30 seconds From the Arduino site for Serial.write and Serial.print: Serial.write() Writes binary data to the serial port. Make sure your Serial Terminal app is closed before powering your device Serial.print ('L ') // String Serial.println (Var) // Print Variable on same line then send a line feed. Int analogValue = 0 // variable to hold the analog value Serial.println(), as specified in the documentation, takes only two arguments, the first being the value that you want to print through the serial port, and the second being the format that you want that value to be sent as. reads an analog input on analog in A0, prints the value out. The problem is that you are using Serial.println() as if it where printf(). Println() returns the number of bytes written, though reading that number is optional - size_t (long) // EXAMPLE
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