A low-cost IoT-based auscultation training device

<span>Auscultation training devices are needed by teachers and students in health schools to practice auscultation techniques. In this paper, a low-cost IoT-based device has been developed using NodeMCU, four proximity sensors, metal as stethoscope, switch, an android smartphone, earphone, phantom doll. The message queuing telemetry transport (MQTT) protocol used for data communication between NodeMCU smartphones, therefore hardware can be many who have application on their smartphones that subscribe topics. results showed was able detect stethoscope. Auscultation smartphone successfully plays normal abnormal breathing sounds based subscribed With production cost of less than 15 USD, we offer inexpensive device. </span>