String inString = myPort. Arduino doesnt have any out of the box way to send float variables over the Serial interface but one could simply send approximations: send the float as an. we expect data with this format f:XXXX MyPort = new Serial(this, "/dev/ttyUSB0", 9600) Serial myPort // Create object from Serial class Serial.begin(9600) // setup serial connection speed * Communicates float data over serial without loss of precision The read () method reads only one character. And on the receiver side you have to read whole float too. Once on the target PC we will do some bitwise logic to reassemble the float exactly how it was on the Arduino. The write method is good for sending raw data (single character, c-string or some buffer) If you really want sending floats in its binary form, you have to pass it as an buffer: Serial.write ( (uint8t)&floatVal, sizeof (intVal)). Then simply use Serial.write() to send the raw bytes over the wire. I choose “f:” but one could use anything like that. The idea is to prepend to the 4 bytes a delimiter, so that we can understand the formatting of the incoming data. send them over the Serial in HEX representation and then unhex on the target machine.ĭISCLAIMER: I’m not an experienced low level C programmer, take the following as potentially wrong. One could then reassemble on the PC using just the opposite procedure. using Serial.write() I can send them raw to the Arduino. So, I came out with the following way: given that on both the Arduino and Processing have 32 bit floats and that both the ATMEL 328 (the microcontroller used by Arduino) and my i386 compatible PC are both big endian processors, I can split the float on Arduino into an array of 4 bytes. Unfortunately, I needed the best precision for my project so the above solutions weren’t actually useful. For a project I’m working on, I had the need to send some float variables computed on the Arduino board to a Processing program running on a computer over a Serial communication Link.Īrduino doesn’t have any “out of the box” way to send float variables over the Serial interface but one could simply send approximations: send the float as an integer and truncate the decimals or send it only with two digit for the decimals.
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