For ESP-01 to work well with Arduino UNO, we need to upgrade the firmware of the ESP-01 to V2.2.1 Steps to flash SDK : 1) Put VCC and CH_PD of ESP-01 to 3.3V on UNO.

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The next step is to start your own experiments with ESP-01. For examples, the Arduino core for ESP8266 comes with plenty of interesting sketches to fiddle with! Note: As described earlier, when trying ...