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.
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.
ESP8266 the core includes a Debugging feature that is controllable over the IDE menu. The new menu points manage the real-time Debug messages. It is very useful to sort out watchdog trigger and exception errors. For debugging you can use Serial or Serial 1 and also you can choose the debug level such as WIFI, Core, OTA etc.
Many times you stuck at WDT reset and Stack Exception errors, this is most rarely used tool, many people don’t know it exists. Let’s get know to it, Its very powerful tool comes with NodeMCU or ESP8266.
In this tutorial ESP8266 we will see How to control Servo motor using NodeMCU web server? where the position of the Servo Motor can be controlled through a Web Page (within the same WiFi Network).
