ESP Relay Board Hardware

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List of the boards

Consistent Functions

ESP-relay-DHT22.png

IIC: IO4 and IO5

  • IO4 and IO5 hs pull up resistors for IIC bus to use
  • Demo code for IIC OLED screen for LUA can be found at nodemcu github, /master/lua_examples/u8glib/ this folder, or click here to browse.
  • To remove the pull-up resistor, find the 2x two-very-close-pin on the right side of break away header pin 4 and pin 5, use knife to cut them, then 4.7K resistor will be disconnected. Also can add solder to re-connect them later.

DHT Sensor

  • Please connect the board to sensor by wires, because the PCB and relays will generate heats!!
  • DHT22 support plug on to use, feel free to use wires or socket to settle the DHT sensor, pin definition is 3V3, data, NC and GND
  • Default firmware has DHT module enable, upload example code will work directly. demo code here., or download lua sketch File:DHT22.zip, in esplorer run DHT22.lua direct to read temperature humidity

General Pin Definition

  • Pin Definition for standard esp relay board, relay VDC board, relay SPDT board.
ESP8266 Pins Board Pins Note Function
IO12 Relay 1 - relay 10A load max.
IO13 Relay 2 - relay 10A load max.
IO16 Status LED - -
IO14 reserved DHT22 socket pull-up 10K resistor
IO4 DHT22 pull-up 4.7K resistor, can be disconnected
IO5 DHT22 pull-up 4.7K resistor, can be disconnected
IO0 button BTN2 pull-up 10K resistor Hold down then power up to enter into flash mode
IO2 button BTN1 - programmed for clear config from code version 1.2
IO15 - - -

Documents

B004 box.jpg
  • Case size see on the image.

Projects (if you want list please let me know)


Further Read