low power digital thermometer - continuous operation for more than 6 months

low-power digital thermometer elektor april 1983 E. Schmidt continuous operation for more than 6 months In spite of the wide choice of devices avail- able, digital thermometers have not yet become fully accepted. The advantages are: the temperature can be clearly read off at a distance; the response time is very short and the temperature sensor can be installed at some distance from the unit. In contrast to the usual mercury and `pointer" thermometers, however, the elec- tronic version requires its own power source. Of course, it is also much more expensive. It seems, therefore, that digital thermometers will only become more popular when the problem involving price and energy con- sumption has been at least partially solved. Special ICs are needed for this type of circuit, but the investment is worthwhile. The circuit In principle, this thermometer consists of two main circuit components (see figure 1). These are the temperature sensor IC2, whose output voltage is proportional to...