In this post we are reviewing the ESP-01 Wi-Fi Relay Module. It is one of the cheapest smart switches you can purchase ... In the ESP-01 board, the blue LED is wired between the VCC and the TX pins, ...

Curve tracer in hand, he set up an ESP-01 module to set a GPIO to input, and started increasing the voltage. The tests have shown that, ... The VCC rail is connected to a 3.3V linear LDO regulator.

The ESP-01 launched the ESP8266 revolution back in 2014, and while today you’re far more likely to see somebody use a later version of the chip in a Wemos or NodeMCU development board, there … ...