Developing a Hydroponics System with the Incorporation of an Arduino Uno-Powered pH Sensor

ISBN: 979-8-89480-841-3


From 2005 to 2050, crop demands will increase by 100% to 110% and 50% of land will not be suitable for agriculture (Monsees, 2019). To address this issue, we developed a cost-efficient hydroponic system. In phase 1 of our project, we compared the growth of plants in a long, shallow system and a deep, short system. All p-values were over 0.05, indicating that there is no difference in plant growth between the two different tub sizes.. During phase 1 we faced problems with consistently measuring the pH which led to the wilting and deaths of some plants due to over absorption of nutrients. We decided to focus on pH in our phase 2 project with two main goals: to design a cost-efficient hydroponic system that is sustainable to grow fresh basil and to develop a pH sensor with the use of Arduino Uno that provides accurate, instant readings. The sensor monitors and records the system's pH, notifying users when the pH is not in its optimal range of 5.500-6.500. The sensor was connected to a spreadsheet and LED lights outside of the hydroponic system that lit up when the pH was too high or too low, allowing for modifications to be made. This system offers an alternative method of monitoring of pH, while still being financially accessible.

References

  1. Behrman, J. R. (1993). The economic rationale for investing in nutrition in developing countries. World Development, 21(11), 1749–1771.
  2. Dixon, G. R., & Tilston, E. L. (2010). Soil-borne pathogens and their interactions with the soil environment. In Soil Microbiology and Sustainable Crop Production (pp. 197–271). Springer, Dordrecht.
  3. HTG Supply: Hydroponics & Indoor Garden Supply Store. (n.d.). Retrieved January 1, 2023, from https://www.htgsupply.com/
  4. Hydroponic Systems for Sale. Planet Natural. Retrieved from https://www.planetnatural.com/product-category/growing-indoors/hydroponics/hydroponic-systems/
  5. Interfacing Atlas Scientific pH Sensor with Arduino via UART/I2C. (n.d.). How To Electronics. Retrieved January 2, 2023, from https://how2electronics.com/interfacing-atlas-scientific-ph-sensor-with-arduino-via-uart-i2c/
  6. Kramer, C. V., & Allen, S. (2015). Malnutrition in developing countries. Paediatrics and Child Health, 25(9), 422–427.
  7. Liliane, T. N., & Mutengwa, S. C. (2020). Factors affecting yield of crops. Agronomy–Climate Change & Food Security, 9.
  8. Monsees, H., Suhl, J., Paul, M., Kloas, W., Dannehl, D., et al. (2019). Lettuce (Lactuca sativa, variety Salanova) production in decoupled aquaponic systems: Same yield and similar quality as in conventional hydroponic systems but drastically reduced greenhouse gas emissions by saving inorganic fertilizer. PLOS ONE, 14(6), e0218368. https://doi.org/10.1371/journal.pone.0218368
  9. Nguyen, N. T., et al. (2016). Hydroponics: A versatile system to study nutrient allocation and plant responses to nutrient availability and exposure to toxic elements. U.S. National Library of Medicine. Retrieved from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5091364/
  10. Rose, D., & Bodor, J. N. (2006). Household food insecurity and overweight status in young school children: Results from the Early Childhood Longitudinal Study. Pediatrics, 117(2), 464–473. https://doi.org/10.1542/peds.2005-0582
  11. Ryan, K. (2017, October 9). pH Balance and Plants in Hydroponics. Hydroexperts. Retrieved from https://www.hydroexperts.com.au/buying/resource-library/ph-balance-and-plants-in-hydroponics/
  12. Sharma, N., Acharya, S., Kumar, K., Singh, N., & Chaurasia, O. (2019). Hydroponics as an advanced technique for vegetable production: An overview. Journal of Soil.
  13. UNO R3 | Arduino Documentation. (n.d.). Arduino Documentation. Retrieved December 30, 2022, from https://docs.arduino.cc/hardware/uno-rev3