Introduction NodeMCU V3 NodeMCU V3 is an open-source firmware and development kit that plays a vital role in designing an IoT product using a few script lines.

Step-by-step guide on how to use NodeMCU, an LED, and a DHT11 sensor with Blynk to control the LED and monitor temperature and humidity remotely from a smartphone.

NodeMCU is an open source IoT platform. It includes firmware which runs on the ESP8266 Wi-Fi SoC from Espressif Systems, and hardware which is based on the ESP-12 module.

In order to complete the sample project presented in this Guide you need to flash your ESP8266 with NodeMCU firmware. Refer to chapter-4 in this guide on how to flash the NodeMCU firmware.

The NodeMCU ESP32 module is a compact prototyping board and can be easily programmed via the Arduino IDE. It has 2.4 GHz dual-mode WiFi and a BT radio connection.

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A total of 38 interfaces are connected NodeMCU-32_V1.3 the development board module, refer to below pin diagram, pin function definition table is interface definition.