A good and feasible centrifuge is needed in the world of health, therefore a digital tachometer is needed to calibrate a centrifuge. Digital tachometer is a measuring instrument used to measure the rotation speed of a motor. This tachometer will be tested to function by being compared to using Digital Laser Photo Tachometer. This tachometer will display the number of rotations per minute of a motor according to the speed setting on the centrifuge using the output of this E18-D80NK sensor which will later be processed by the Arduino Nano. As for this feature charger and data storage mode, so that user can save the data of measurement results on SD Card, and beside that user can also be a way of charging when after usage or before usage. At testing the tool used point settings 1000, 2000, 3000, 4000, 5000, and 12000 RPM. Based on the measurement results of centrifuge using tachometer module and comparison tachometer have average percentage of error varying at each setting point. The smallest error 0.8% at the setting Point 3000 RPM, while the largest error 4.9% at the setting point 1000 RPM. The Tacometer error value on this Centrifuge measurement is still within the tolerance limit of ± 10%. ABSTRAKCentrifuge yang baik dan laik pakai sangat dibutuhkan dalam dunia kesehatan, oleh karena itu dibutuhkan tachometer digital untuk mengkalibrasi centrifuge. Tachometer digital merupakan alat ukur yang digunakan untuk mengukur kecepatan perputaran suatu motor. Tachometer ini akan diuji fungsi dengan dibandingankan menggunakan Digital Laser Photo Tachometer. Tachometer ini akan menampilkan jumlah rotasi per menit suatu motor sesuai dengan setting kecepatan pada centrifuge menggunakan output dari sensor E18-D80NK ini yang nantinya akan diproses oleh arduino nano. Adapun ini memiliki fitur charger dan mode penyimpanan data, sehingga user dapat menyimpan data hasil pengukuran pada SD Card, dan disamping itu user juga dapat melaukan pengisian daya apabila setelah pemakaian maupun sebelum pemakaian. Pada pengujian alat digunakan titik setting 1000 , 2000 Berdasarkan hasil pengukuran dari centrifuge yang menggunakan tachometer modul dan tachometer pembanding memiliki rata -rata presentase error yang berbedabeda pada setiap titik setting. Error terkecil 0,8% pada titik setting 3000 RPM, sedangkan error terbesar 4,9% pada titik setting 1000 RPM. Nilai error Tacometer pada pengukuran Centrifuge ini masih di dalam batas toleransi yaitu ±10%.Kata Kunci: Arduino Nano, Sensor E18-D80NK, LCD, RPM, Tachometer.

<em>Temperature is the most important parameter in monitoring Infant Warmer medical equipment. In this study, temperature monitoring was carried out on the Lullaby GE Infant Warmer using INCU based on Arduino Uno. The temperature setting used was 34 ° C, 35 ° C, 36 ° C and 37 ° C with each setting repeated 3 times. The temperature sensor used in the INCU analyzer for T1 to T4 is DS18B20, while the T5 uses a DHT22 temperature sensor. At the Infant Warmer temperature, a low error value was obtained for all temperature settings, namely a temperature of 34 ° C with an error of 0.02, a temperature of 35 ° C with an error of 0.03, a temperature of 36 ° C with an error of 0.004 and a temperature of 37 ° C with an error of 0. The INCU analyzer output low temperature is at T5, with temperature settings of 34 ° C, 35 ° C, 35 ° C and 37 ° C respectively 0.009, 0.07, 0.11 and 0.28. While the error value on T1 to T4 ranges from 0.37, namely at T3 for a temperature setting of 35 ° C to 0.84, namely at T3 for a setting of 37 ° C. It can be concluded that the INCU analyzer that has a high degree of accuracy is the T5 using the DHT22 temperature sensor.</em>

<p><em>One form of physiotherapy is utilizing heat for recovery. Heat therapy can open blood vessels wider, thereby increasing blood flow and supply of oxygen and nutrients to reduce pain in joints, muscles, ligaments and injured tanks. To help health services in the field of physiotherapy the author modifies the therapeutic pillow with Arduino Uno and DS18B20 based as a temperature sensor, LCD as a temperature viewer and a timer and button that functions to choose how long it takes to do therapy. The design of therapeutic pillows is divided into two, namely hardware and software design, hardware design including power supply, a series of drivers and system scenarios. While the software design of this tool uses the Arduino and proteus applications as software. The result of the percentage error at the TP2 measurement is 0.02%. The measurement results on TP3 when the tool is off or off, then the circuit does not get a voltage while when the device is turned on or on the driver circuit gets a voltage of 1.4 Volt. After making the process of making, testing, testing tools and data collection, the author has succeeded in designing a heat therapy pillow using a temperature sensor and ARDUINO UNO based timer controller that can provide convenience when going to heat therapy because it is equipped with an automatically controlled temperature sensor and controller timer. by DS1820 temperature sensor. A therapeutic pillow based on Arduino with 10 minutes of therapy results in a </em><em>temperature of 41</em><em>°C.</em></p>