Hello Ole > http://ethernut.svn.sourceforge.net/viewvc/ethernut/branches/devnut_m3n/nut/dev/sht21.c?revision=3692&view=markup > Found it, thanks. I have written a driver for the I2C BMP085. When working with the SHT21 I will bring my driver to the same structur. If there is interest, it can be integrated in ethernut. Greetings Klaus