ESP Relay Board Hardware

List of the boards

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

ESP8266 Pins	Board Pins	Note	Function
IO12	Relay 1 (or 2)	-	relay 10A load max.
IO13	Relay 2 (or 1)	-	relay 10A load max.
IO16	Status LED	-	-
IO14	reserved DHT22 socket	pull-up 10K resistor
IO4 (board silk print maybe wrong with IO5, please check)	DHT22	pull-up 4.7K resistor, can be disconnected
IO5 (board silk print maybe wrong with IO4, please check)	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	-	-	-

Projects (if you want list please let me know)