Hydroponics is the cultivation of plants that use water as a planting medium without using soil. One of the simplest hydroponics is Deep Water Culture (DWC). DWC is a hydroponic technique that allows plant roots to always be submerged in water containing nutrients. The purpose of the application of controlling the level of hydroponic nutrient solution in the type of Deep Water Culture (DWC) in the box is to ensure that the roots of the plant are always submerged in nutrient solution so that the nutrients are still fulfilled. The results obtained from controlling the level of hydroponic nutrient solution in the type of Deep Water Culture (DWC) in the box is when the level of nutrient solution is less than the specified threshold then the 12VDC pump relay will live to drain the source water to the nutrient solution reservoir. The HC-SR04 sensor is used for reading the level of nutrient solution, so it has an effect on determining the pump life time. The HC-SR04 sensor has a reading error of 0.87%. The duration of the pump life is determined based on the linear regression equation. Controlling the level of nutrient solution based on linear regression linear calculation has a good accuracy of 88.6%.
Jomblang Village is one of the villages in Candisari sub-district, Semarang city. Jomblang Village has an area of ± 108 Ha and has a population of 17,322 people, has 15 RWs and 120 RTs. Activities that have been developed in Kelurahan Jomblang include catfish fattening, packaging screen printing, waste processing and catering including tempe craftsmen, tofu into chips. The activity carried out is an initiative of the local community, which is carried out with affordable capital and can be done by residents on the sidelines of free time which can be used as a side job. In this service, PKK mothers in RW V, Jomblang sub-district, Candisari subdistrict, Semarang has conducted training in the form of knitting skills and making simple knitting bags, followed by mentoring on how to market their products digitally (via the internet). The completion of community service is expected to make it easier for mothers to sell their knitting products and increase their product sales to the community through IoT technology so that it can improve the family economy.
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