Reading serial data from an Arduino?

Serial protocols such as the one used for serial over USB are byte oriented, not packet oriented. As such, there's no guarantee that a read will return the entire 'message' sent by the other end, or just part of it, as you're observing, because there's no concept of message or packet.

Serial protocols such as the one used for serial over USB are byte oriented, not packet oriented. As such, there's no guarantee that a read will return the entire 'message' sent by the other end, or just part of it, as you're observing, because there's no concept of message or packet. Instead, you need to delimit your messages in some way - such as by appending a newline - or preprend messages with a length field, so you know how many bytes to read.

Then once I read all 4 bytes I know my input data is good. – jos76 Dec 11 at 22:31 1 @jos76 Yes, if you know you're sending 4 bytes, that will work fine.In the example you gave, though, you're sending a decimal number, rather than a 4 byte float. – Nick Johnson Dec 11 at 22:38 thanks, you solved my problem!

– jos76 Dec 11 at 22:46.

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