The project presented here provides a novel form of temperature display. Its appearance makes it an ideal add-on to the ‘Rhine Tower Clock’ and will certainly attract attention.At the heart of the circuit is a National Semiconductor COP8782 microcontroller, as has already been used in Elektor Electronics projects like the Running Text Display (PC Topics Supplement, February 2000). The microcontroller reads temperature data from a sensor IC made by Dallas Semiconductor, which has also been seen before in Elektor Electronics projects (‘Temperature Measurements with the DS1621’ and ‘DS1621 Datasheet’, both in the March 2000 issue). A DS1621 programmer was published in the February 2001 issue.The microcontroller also has the job of displaying the measured value on 32 multiplexed LEDs.