In general, medical equipment at the Hospital to monitor body temperature such as a thermometer is less effective for nurses and doctors because it takes time to come to the patient’s room to retrieve body temperature data. Then, when the patient’s condition suddenly worsens, it still takes time for the treatment process. Therefore, the authors intend to make a tool that can help nurses monitor the patient’s body temperature through an Android smartphone in real time and equipped with telemedicine that can send notifications in the form of SMS when the patient’s body temperature is outside the normal limit. The working principle of this tool is that the body temperature data received by the DS18B20 sensor that will be processed by the Atmega328 microcontroller, then displayed on the OLED LCD and sent to an Android smartphone via Bluetooth HC-05. If body temperature data is outside the normal range, the Android application will send an SMS to another recipient’s smartphone. Based on the results of the tool testing, the highest data error results is 0.829% and the lowest is 0%. For the process of sending data using Bluetooth HC-05 by taking measurements every 1 meter, the maximum distance obtained is 13 meters with a hitch. In the application of telemedicine in the form of automatic SMS sending successfully sends body temperature to other recipient’s cellphone.