Electronics Circuit Diagram

The following schematic shows a simple design and low-cost budget DEW sensor circuit diagram using LM258N IC. As the humidity around the ceramic goes up, the resistance in the sensor circuit increases. When the resistance reaches a pre-specified level, the circuitry displays a warning message, and shuts down the camera to protect other components.

Under normal conditions, resistance of the dew sensor is low (1 kilo-ohm or so) and thus the voltage at its non-inverting terminal (pin 3) is low compared to that at its inverting input (pin 2) terminal. When humidity exceeds 80 per cent, the sensor resistance increases rapidly. As a result, the non-inverting pin becomes more positive than the inverting pin. This pushes up the output of IC1 to a high level. As a consequence, the LED inside the opto-coupler is energized.

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