Alat Ukur Kualitas Air dengan Serial Komunikasi RS485 dan CAN Bus

Abstract

Water is an important factor in supporting life. Factors that need to be considered include the level of turbidity and the acidity, or alkalinity, of the water. This research was carried out to create a design tool that aims to monitor water quality, especially turbidity and acidity or alkalinity, using the SEN0189 turbidity sensor and the E201 pH sensor. The test parameters used in this research are a turbidity sensor type SEN0169 and a pH sensor type E201. RS485 and CAN Bus are used as media to transmit data from sensors. Testing on the turbidity sensor is carried out by testing a sample whose turbidity value is known, namely 1000 NTU. The sample is then tested by taking a 10 ml sample of turbid water and measuring it using a turbidity metre to determine the current value, and then the 10 ml of turbid water is replaced with 10 ml of clear water. to get a comparison value, and carry out repeated measurements until you get clear water with a level of 0 NTU. The pH sensor is tested by measuring a pH sample of 1–14, where if the pH is <7, it is acidic, pH 7 is neutral, and >7 is alkaline. Measurements are carried out with a pH metre to determine the acidity or alkalinity levels. Based on the test results, the turbidity sensor has an error percentage of 0.11% and the pH sensor has an error percentage of 0.13%. The conclusion is that for each reading of the turbidity sensor and pH sensor, it is known that if the turbidity sensor is measuring cloudy water, the resulting output voltage is small, and if it is measuring clear water, the resulting output voltage is high. Meanwhile, when a pH sensor detects an acidic solution, the output voltage produced is high, and vice versa, when the solution is alkaline, the output voltage produced is small.