Looking for practical Arduino projects? This guide shows how to control a relay from your smartphone using an Arduino Uno — either via Bluetooth or Wi-Fi.

Connect ESP01 to serial (hardware port: pin#0 and pin#1) of UNO and power up. Wait until LED turns on. Host a websocket client homepage (example in "accessory" directory) in the same local network.

Setup baud rate and wifi connectivity of ESP01. (115200) Connect ESP01 to serial (hardware port: pin#0 and pin#1) of UNO and power up. Wait until LED turns on. On a PC in the same local network, run ...