LCD thermometer

In this page, I introduce the LCD thermometer


At this thermometer, the IC thermo sensor (S8100) or the
diode (1S1588) is used as the thermo sensor. When using the IC thermo
sensor, the thermometry to +100°C from -40°C is possible. Also, when
using the diode, the measurement to +150°C from -20°C is possible. Both
sensors are contained in the kit.
This time, I used the diode as the thermo sensor to measure more than +100°C.
ICL7136 of Intersil (Harris) is used for the thermometer
and is measuring the change of the forward direction minute voltages of
the diode by the temperature. The 3-1/2 digits liquid crystal display
(SP521PR) is used for the display. The most significant digit can
display only "1".
The consumption electric power of ICL7136 is very small
and it is possible to operate about 3 months continuously with the 9-V
cell.

The main parts are contained in the kit. The plastic case
and the cell are contained. But, there is not a connection cable of the
sensor.