Tag Archives: NodeMCU

ESP8266 NodeMCU HTTPS Secured POST Request

In this example we learn how to send Secured POST request to a secured https web page using NodeMCU or ESP8266? As we know all web pages are HTTP protocols, GET and POST are methods of communicating between web browser and the server. Also you look towards server side php Example coding. If you are looking for HTTPS GET method read here.

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ESP8266 DHT11 Humidity Temperature Data logger

In this tutorial we are interfacing DHT11 or DHT22 Humidity temperature sensor with ESP8266 NodeMCU. We are making complete Humidity and Temperature data logger with DHT11 and NodeMCU. Data logger web server with real time graphs and tables, mostly seen on thingspeak. But this time we are putting complete graphs and tables all inside NodeMCU without using thingspeak. For this we need graphs library that we are using from chartsjs.org an open source Chart drawing library and Knowledge of alax, html and javascript.

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Interfacing DHT11 with NodeMCU Example

In this tutorial we are interfacing DHT11 or DHT22 Humidity temperature sensor with NodeMCU.

The DHT11 (or DHT22 and similar) are cheap temperature and humidity sensors. The communicate with a ESP8266 is over a single wire, but unfortunately it is not compatible with the 1-Wire protocol defined by Dallas Semiconductors.

The electric connection to the NodeMCU is very simple, as the DHT series can be powered direct with 3.3V. Only 3 wires are needed: VCC, GND and the data line.

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ESP8266 AT Commands Set

This tutorial provides AT commands based on ESP8266_NONOS_SDK and explain how to use them. AT command set is divided into: Basic AT commands, Wi-Fi AT commands, and TCP/IP AT commands.

ESP8266 is a powerful controller with 4Mbytes of Flash and 84Kbytes of RAM. Then why you should use it as just Serial to WiFi module. I recommend use ESP with direct flashing i.e. without using AT commands.

You can Download Complete AT command set for ESP8266 NodeMCU here.

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ESP8266 Absolute Maximum Ratings

Espressif’s ESP8266 delivers highly integrated Wi-Fi SoC solution to meet user’s continuous demands for efficient power usage, compact design and reliable performance
in the Internet of Things industry.
With the complete and self-contained Wi-Fi networking capabilities, ESP8266EX can perform either as a standalone application or as the slave to a host MCU. When ESP8266EX hosts the application, it promptly boots up from the flash. The integrated high-speed cache helps to increase the system performance and optimize the system memory. Also, ESP8266EX can be applied to any microcontroller design as a Wi-Fi adaptor through SPI/SDIO or UART interfaces.
nodemcu specifications

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