TEMPERATURE_METER

Published:2009/6/26 1:33:00 Author:May | From:SeekIC

TCA965 window discriminator IC allows the potentiometers RV1 and RV2 to set up a window height and window width respectively. R1 and thermistor TH1 for a potential divider connected across the supply lines. RI is chosen such that at ambient temperature the voltage at the junction of these two components will be approximately half supply. As the temperature of the sensor changes, the voltage will change. RV1 will set the point which corresponds to the center voltage of a window the width of which is set by RV2. The switching points of the IC feature a Schmitt characteristic with low hys-teresis. The outputs of IC1 indicate whether the input voltage is within the window or out-side by virtue of being either too high or too low. The outputs of IC1 drive the LEDs via a current limiting resistor.



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