Abstract
This research is about a digital temperature regulator in the fishpond. Which is a circuit through which the temperature of the fishpond is linearly controlled depending on the temperature of the water or the environment. This device makes use of a heating element, which goes ON/OFF when the temperature in the water becomes high/low or reaches a temperature higher or lower than the present value. The temperature sensor used is LM35 with a Negative Temperature Coefficient (NTC) in which its resistance falls as the operating temperature increases. The LM35 is a very sensitive device to heat, such as it can be used in a way that an increase in temperature will lead to a change in its resistance. Fishes survive in natural water under the very conditions it is assumed that natural waters have natural temperature regulators but in fishponds nevertheless. They find it difficult to survive in harsh weather conditions like the cool season (winter). The temperature will be controlled between 24°C – 30°C which is the optimum survival temperature of the fish. This is because, so as the temperature of the environment changes, so that of the water too by convection.
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