Rancang Bangun Alat Ukur Kekeruhan Air Menggunakan Fototransistor dan LED Inframerah Berbasis Arduino Uno

In this research, the water turbidity measurement tool based on Arduino Uno has been designed and built using phototransistors infrared LEDs. This measuring instrument consists of a series sensors, as process, LCD I2C value viewer, Micro SD data storage, RTC timer. study used two samples with various concentrations. The sample used, namely distilled plus impurities in form soil ash. is still 100 ml variations concentration ranging from 0,1-0,9 gr. Sensor test results show that greater level, voltage obtained. scanning ranges 2,02 V-4,00 V for groundwater V-4,31 ash water. reading uses standard 0 NTU to 331,4 NTU, while 284,4 NTU. Data sensor an equation convert artificial instrument's into value. Then, taken same sample, so groundwater's was obtained 318,94 285,13 Based results, average accuracy Soil amounted 94,66%, 96,63%.