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WiroTomo SourDuino: Instrument for Measuring the Acidic Level of Home-Industry Fruit Juice Production

The Covid-19 epidemic makes the availability of vitamins and immune-enhancing supplements in Indonesia rare and costly. To deal with this situation, people produce and sell alternative vitamin products and supplements by themselves. One of the most frequently made and popular products is fruit juice. Fruit juice is believed to have a beneficial effect on maintaining body stamina from the disease. Unfortunately, many fruit drinks that are produced by the home industry do not fulfill some of the expected quality standards. One problem that is often experienced by consumers is a less-controlled sour taste. Therefore, in this research, an Arduino-based measuring instrument using SEN0161 pH Meter is designed to help home-grade fruit drinks makers to maintain the stability of their products’ acidity. The instrument has a reasonably precise measurement accuracy with a very minimum error rate for the pH 4.01 standard of 0.25%. For the standard pH 7.01, it has an error rate of 2.71 %. Also, the pH standard of 10.01 has an error rate of 3.9%. This pH meter instrument is considerably easy to build with affordable material costs. Furthermore, this study also provide the microcontroller source code to be developed and distributed freely.