In the Pd svn I have an external [b2f] which probably does what you want.
Not sure if it made in into Pd-extended yet as there don't seem to be many recent builds available, but it should be straightforward to compile.

http://sourceforge.net/p/pure-data/svn/HEAD/tree/trunk/externals/mrpeach/serializer/

Martin

On Sun, Oct 19, 2014 at 10:48 PM, Peter P. via Pd-list <pd-list@lists.iem.at> wrote:
Dear Pd-list,

I am trying to get a Razor AHRS sensor to work with Pd using its
comport external.
This sensor sends three angles (yaw, pitch, roll). Each of these
angles is said to be sent as a 4 byte (single precision) float value.

This float value arrives in Pd from comport's outlet as three values
0-255.
The byte order is little-endian.

I understand that a 4byte single precision float has a 1bit sign,
an 8bit exponent and a 23bit mantissa.

After five hours of trying I am wondering how I could convert this
number into a Pd float.

I would be delighted to receive any pointers as I have run out of
ideas by now.

thank you so much!
P

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