ESP Relay Board Hardware

List of the boards

• ESP Relay Board SPST - AC in, Single status relay
• ESP Relay Board SPDT - AC in, Dual status relay
• ESP Relay Board IL - AC in, Relay with extra protections
• ESP Relay Board VDC - DC in, VIN 5-28V
• ESP Light - 12/24V DC Vin, LED strips or WS2812 control

Consistent Functions

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

• Case size see on the image.

Projects (if you want list please let me know)

• Use ESP Relay Board with Wiscore and Openhab
• read value and control, graphic data online (Russian)

Further Read

• Relay circuit protection - Relay#Circuit_Protction