Internet of Thing (IoT) makes the monitoring and controlling process become accessible everywhere and every time. In this paper, the IoT is used to control the speed of a DC Motor remotely through smartphone apps. The proposed system uses the 50Wp solar panel and DC-DC Converter to provide 24V dc to the motor. In specific, a PID algorithm is applied to control motor speed from the measured back EMF. There are 3 experiments that have been done. The first is controlling motor speed through a smart phone, the second is the relationship between EMF and DC Motor speed, the third experiment was monitoring motor speed on Thingspeak and Blynk apps.

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