Thermometer consisting of LM35 and ICL7107
The integrated temperature sensor LM35 has a sensitivity of l0mv/°C, that is, when the temperature is 10°C, the output voltage is 100mv. The temperature measurement accuracy is +/-0.5°C at normal temperature, and the current consumption is only 70uA at the maximum. Within 0.1C. When using a single power supply of more than 10V, the measurement temperature range is 2--+/-150°C; when using dual-supply power supply, the measurement temperature range is -55--+150°C (metal case package) and -40-- +110 ° C (T092 package), no adjustment is required.
This circuit adjustment is very simple. First enter the LM35 old people ice water, adjust the PRt, so that the display shows 0.0 °C. Then enter the LM35 to put 100 °C boiling water, adjust PR2, so that the display shows 100 °C. Repeat the adjustment multiple times. However, it should be noted that the LM35 taken out of the ice water waits for a while before being released into the water to avoid damaging the sensor LM35.
The digital thermometer circuit composed of LM35 and ICL7107 is shown in the figure.
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