Then you can access b to b quite happily. And if the user will be entering a string, use Serial.readString (). If the user will be entering a float, use Serial.parseFloat (). If the user will be entering an int, use Serial.parseInt (). So instead of getting 4 bytes and trying to fill them as a float you get a float and read it as 4 bytes: byte *b = (byte *)&floatVal Serial.parseFloat () Serial.readString () The data type of the information input by the user determines which function you should use. There is an example of this on the doc page you linked: String stringOne String (5.698, 3) // using a float and the decimal places. You'll need to convert your float into a String then add the two Strings together. var1 1st float, and var2 2nd float) I’m really not sure how to. The docs say the + operator only supports adding two String types together. To avoid blocking calls to Serial.write (), you can first check the amount of free space in the transmit. If the transmit buffer is full then Serial.write () will block until there is enough space in the buffer. But since it does not know how to represent a Gyrodatastructure, you have to Serial. If there is enough empty space in the transmit buffer, Serial.write () will return before any characters are transmitted over serial. Sending as text Serial.print () is intended to print a text representation of the data you give it. I’m trying to get my sketch to read these two floats, and update variables with them. The 32-bit hex numbers above are the binary representations of the floats.

Short version: I’m trying to receive two float values via usb serial on my Tinyduino, formatted as follows: <01234.56,10987.65>.

Instead you need to work the other way around - cast a type that has smaller alignment requirements over the type that has larger requirements. Hi all, I’ve hit a roadblock in my latest project. If you were to enable the display of warnings you would most likely see it complain about 'dereferencing type-punned pointer will break strict-aliasing rules' which is what you are doing here.īasically you are trying to cast an array of four 8-bit values which can have any alignment they like (byte alignment) to a 32-bit float value which needs 4-byte alignment.

Arduino serial write float