Digital thermometer with LED / LCD display

Now we bring you two versions of a homemade digital thermometer with ICL7106 that I recently built. One version uses a LED display, the second version LCD display. In both versions, is used silicon transistor as a temperature sensor. The temperature is determined by the voltage drop, temperature dependence is approximately -2. 2 mV / °C. Power can visit page.

be either a 9V battery or a suitable power supply. Oscillator with R1 and C1 determines the sampling frequency - using 100k and 100p the frequency is 3 Hz. Theoretical temperature range is from -199. 9 to 199. 9 °C, the real temperature range is limited by the measuring transistor to approximately -65. 0 To 150. 0 °C. Resolution to 0. 1 °C. If you want to use it as a room thermometer, it is not necessary to use the hundreds digit, (left) or minus sign. Also digit right from the decimal point...