Chao: /* General Pin Definition */

2020-03-08T03:28:41Z

General Pin Definition

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== 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 ==
[[File:ESP-relay-DHT22.png|thumbnail]]
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, [https://github.com/nodemcu/nodemcu-firmware/tree/master/lua_examples/u8glib 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. [http://nodemcu.readthedocs.io/en/master/en/modules/dht/ demo code here.], or download lua sketch [[File:DHT22.zip|here]], 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.

{| class="wikitable sortable"
|-
! 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 || - || - || -
|}

== Documents ==
[[File:B004 box.jpg|thumbnail]]
* Case size see on the image.
Projects (if you want list please let me know)
* [https://www.hackster.io/naresh-krish/home-automation-using-wiscore-and-openhab-1ec6e4 Use ESP Relay Board with Wiscore and Openhab]
* [https://www.youtube.com/watch?v=1WVo7KWC2Ho read value and control], [http://oster.com.ua:3000/dashboard/snapshot/gSaJImA2U38y6j3m8CEcLAWH8LocoISh?orgId=0 graphic data online] (Russian)

== Further Read ==
* Relay circuit protection - [[Relay#Circuit_Protction]]

[[Category:ESP Relay Board]]

ESP Relay Board Hardware - Revision history

Chao: /* General Pin Definition */