The use of formalin in food is now widely circulated in big cities. Formaldehyde is always chosen by producers so that these products are more durable and also inexpensive to help entrepreneurs reduce production costs. The difficulty of the community in identifying the characteristics of the presence of formaldehyde makes the community restless and feels disadvantaged. Therefore, a tool is designed to detect formaldehyde in arduino-based foods. This arduino-based system can test food ingredients practically and effectively because it doesn't take long to see the results. HCHO sensors are used to detect samples in food ingredients. With the HCHO sensor, humans can know whether the food contains formalin or not. The work process of this tool through the gas released from the food material. The test results will be displayed on the LCD screen, where the output is positive or not which has been detected by the sensor.
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