RANCANG BANGUN PEREKAM DATA KELEMBABAN RELATIF DAN SUHU UDARA BERBASIS MIKROKONTROLER

Abstract

Relative humidity (RH) and air temperature are important parameter in meteorological measurement. These two parameters should be measured continuously for fisheries and marine environmental monitoring. A data logger for this purpose need to be developed. The data logger consist of ATmega32 microcontroller run at 8Mhz clock, DS1307 Real-time Clock, Sensirion SHT11 sensor, SD card socket, Low-dropout Linear Regulator LP2950 and AIC1734. Light emitting diode and several passive components such as resistor and capacitor also needed. Data logger firmware was written in BASIC language using BASCOM-AVR version 1.11.9.0. The field test showed the greatest error in measure RH is -20,4% and air temperature is 7,3ºC. Measurement error is caused by contamination in sensor probe and lack of PCB design in releasing heat.