Fish Tank Oxygenation Controller Fish Tank Oxygenation Controller The fish tank at home uses a homemade CO2 generator, which cannot be stopped and is turned on 24 hours a day. Therefore, the dissolved oxygen in the water is insufficient, and a layer of oil film appears on the water surface. As long as there is enough oxygen in the water, digestive bacteria will decompose the oil film, and there is no need to clean the oil film. The task to be completed by this controller is to turn off the oxygen pump when the light is turned on to illuminate the fish tank, and turn on the oxygen pump at other times. Because the task is simple, the circuit is also simple. In fact, it is just to turn on and off the oxygen pump through a relay. Since the circuit is relatively simple and I am relatively lazy, I will directly draw the PCB instead of the schematic diagram. The PCB is as follows: Component list: 1. 3 sockets with a spacing of 5.08mm 2. 2 150K 0.5W resistors 3. 1 0.47UF/630V capacitor 4. 1 silicon rectifier bridge DB107 5. 1 electrolytic capacitor 100UF/25V 6. 1 5V relay HRS1H-S 7. One circuit board Circuit connection method: The \"POWER\" terminal in the circuit is connected to the power supply in the fish tank lighting system (the power output by the microcomputer controller, or the power supply of the fluorescent lamp), the \"IN\" terminal is connected to the power input (220V), it is better to connect a 1A fuse for safety, and the \"OUT\" terminal is connected to the air pump. The following figure shows the actual board: The attachment of this article has a compressed file of the PCB, which needs to be opened with a PDF tool and printed at 1:1. ……
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