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lang-cpp
Serial.begin(0)tells the Arduino that it should communicate with serial at 0 bits per second. As you might expect, this means that the Arduino will never send any data at all.Serial.begin(4000)will cause the Arduino to send data at 4000 bits per second. This is non-standard, but otherwise fine.Serial.begin(300)) has the Arduino send data more slowly. Increasing it, say to 57600 will send data faster. Both the sending system and the receiving system need to agree on what speed to use: your computer's serial program, like the Arduino Serial Monitor window, will let you set the speed at which your computer will receive data but you can only select from the common speeds: 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600 and 11520 bit/sec. You can't enter other speeds, like 4000. 9600 is usually good.Baud and BPS are two different things... can't find the link I was looking for now.- Here's one explanation: Appendix C: "baud" vs. "bps"