1.2 Temperature Sensor

A temperature sensor is needed to monitor the aquarium's water temperature. The DROK temperature sensor is ideal for aquarium application because the sensor is sealed in a stainless steel sleeve, allowing it to be safely submersed into the water.

The temperature sensor is configured as part of a voltage divider circuit (see Figure 1-3), and the output of the divider circuit is fed into an ADC input. In terms of ADC voltage, as the temperature increases, the temperature sensor experiences less resistance and allows a higher voltage to reach the pin.