LCD thermometer - accurate to 0.1 of a degree

10-20 — elektor october 1982 L.C.D. thermometer The 7106 is a well known IC in the world of A/D converters, and was chosen for three main reasons. Firstly this IC is a "jack of all trades" and is widely used in all forms of voltage or temperature measuring instruments. Secondly, because it is universally available and relatively inexpensive. Last but not least, the 7106 and its big brother (7116), have so many functions already integrated within themselves that only a few passive components and a LCD are needed to complete a good circuit. The 7106 contains an A/D converter, clock generator, reference voltage dependant upon the time. In turn the contents of the counter are then dis- played on the LCD. The advantage of using this method is that a relatively simple and straigthforward oscillator can be applied. The oscillator frequency of the IC is in fact determined by the values of R2 and C3. This frequency also determines the number of "samples" taken in every second. As a matte...