Alat Monitoring Infus Set pada Pasien Rawat Inap Berbasis Mikrokontroler ATmega 8535

The method used to know the volume of Infusion fluid is detecting droplets that are on Infusion chamber. The droplets are detected by the light sensors is infrared LED and photodiode. The voltage signal from the sensor is conditioned by the digital comparator IC LM339. ATmega microcontroller 8535 is used as a data processor of the comparator output so that information from the monitored parameters can be displayed on the LCD and LED and buzzer flame. The output voltage when infrared sensors detect a drop is 1.02 V, while sensor does not detect a drop the output voltage drops is 180 mV. Parameters that can be detected from these tool include the number of drops per minute with a maximum number of drops / min was detected at 255 drops, a warning when the droplets are not detected for 10 seconds and a warning when Infuse fluids will run out (± 50 ml). Buzzer’s sound still clearly audible and not dangerous for nurse’s hearing based on noise level threshold value though the situation in the nurse’s room in crowded conditions.