This project demonstrates how to use MQTT to control 4 AC bulbs using the MIT App Inventor platform and NodeMCU. MQTT is a lightweight messaging protocol that is ideal for IoT applications, and ...

This is a simple project. It uses an Android device to switch an LED driven by the Arduino. Connectivity is provided by the Bluetooth module inserted in the breadboard. But one look at the UI on the ...

For the challenge, I wanted to send data from my computer's real serial port (RS232 9-pin connector). For that, I created an adaptor circuit because the voltages on a computer serial port are ...