diff --git a/lua_modules/si7021/README.md b/lua_modules/si7021/README.md
new file mode 100644
index 00000000..9e409651
--- /dev/null
+++ b/lua_modules/si7021/README.md
@@ -0,0 +1,6 @@
+Support for this Lua module has been discontinued.
+
+Equivalent functionality is available from the si7021 module in the NodeMCU
+firmware code base. Refer to `docs/en/modules/si7021.md` for API documentation.
+
+The original Lua code can be found in the [git repository](https://github.com/nodemcu/nodemcu-firmware/tree/3e24b1c75b4b4fd469be784fd5d596f0eb3871ff/lua_modules/si7021).
diff --git a/lua_modules/si7021/si7021-example.lua b/lua_modules/si7021/si7021-example.lua
deleted file mode 100644
index 5c6ed6cc..00000000
--- a/lua_modules/si7021/si7021-example.lua
+++ /dev/null
@@ -1,24 +0,0 @@
-
-tmr.alarm(0, 60000, 1, function()
-
-	SDA_PIN = 6 -- sda pin, GPIO12
-	SCL_PIN = 5 -- scl pin, GPIO14
-
-	si7021 = require("si7021")
-	si7021.init(SDA_PIN, SCL_PIN)
-	si7021.read(OSS)
-	h = si7021.getHumidity()
-	t = si7021.getTemperature()
-
-	-- pressure in differents units
-	print("Humidity: "..(h / 100).."."..(h % 100).." %")
-
-	-- temperature in degrees Celsius  and Farenheit
-	print("Temperature: "..(t/100).."."..(t%100).." deg C")
-	print("Temperature: "..(9 * t / 500 + 32).."."..(9 * t / 50 % 10).." deg F")
-
-	-- release module
-	si7021 = nil
-	package.loaded["si7021"]=nil
-
-end)
diff --git a/lua_modules/si7021/si7021-lewei.lua b/lua_modules/si7021/si7021-lewei.lua
deleted file mode 100644
index 28ac9189..00000000
--- a/lua_modules/si7021/si7021-lewei.lua
+++ /dev/null
@@ -1,41 +0,0 @@
-
-    --创建一个定时器
-    tmr.alarm(0, 60000, 1, function()
-
-		SDA_PIN = 6 -- sda pin, GPIO12
-		SCL_PIN = 5 -- scl pin, GPIO14
-
-		si7021 = require("si7021")
-		si7021.init(SDA_PIN, SCL_PIN)
-		si7021.read(OSS)
-		Hum = si7021.getHumidity()
-		Temp = si7021.getTemperature()
-
-    	--定义数据变量格式
-    	PostData = "[{\"Name\":\"T\",\"Value\":\"" .. (Temp/100).."."..(Temp%100) .. "\"},{\"Name\":\"H\",\"Value\":\"" .. (Hum/100).."."..(Hum%100) .. "\"}]"
-    	--创建一个TCP连接
-    	socket=net.createConnection(net.TCP, 0)
-    	--域名解析IP地址并赋值
-    	socket:dns("www.lewei50.com", function(conn, ip)
-    		ServerIP = ip
-    		print("Connection IP:" .. ServerIP)
-    		end)
-    	--开始连接服务器
-    	socket:connect(80, ServerIP)
-    	socket:on("connection", function(sck) end)
-    	--HTTP请求头定义
-    	socket:send("POST /api/V1/gateway/UpdateSensors/yourID HTTP/1.1\r\n" ..
-    				"Host: www.lewei50.com\r\n" ..
-    				"Content-Length: " .. string.len(PostData) .. "\r\n" ..
-    				"userkey: yourKEY\r\n\r\n" ..
-    				PostData .. "\r\n")
-    	--HTTP响应内容
-    	socket:on("receive", function(sck, response)
-    		print(response)
-    		end)
-
-		-- release module
-		si7021 = nil
-		package.loaded["si7021"]=nil
-
-	    end)
diff --git a/lua_modules/si7021/si7021.EN.md b/lua_modules/si7021/si7021.EN.md
deleted file mode 100644
index 983bb978..00000000
--- a/lua_modules/si7021/si7021.EN.md
+++ /dev/null
@@ -1,131 +0,0 @@
-# si7021 module
-
-##Require
-```lua
-si7021 = require("si7021")
-```
-## Release
-```lua
-si7021 = nil
-package.loaded["si7021"]=nil
-```
-<a id="si7021_init"></a>
-##init()
-####Description
-Setting the i2c pin of si7021.<br />
-
-####Syntax
-init(sda, scl)
-
-####Parameters
-sda: 1~12, IO index.<br />
-scl: 1~12, IO index.<br />
-
-####Returns
-nil
-
-####Example
-```lua
-si7021 = require("si7021")
-gpio5 = 1
-gpio4 = 2
-sda = gpio5
-scl = gpio4
-si7021.init(sda, scl)
--- Don't forget to release it after use
-si7021 = nil
-package.loaded["si7021"]=nil
-```
-
-####See also
-**-**   []()
-
-<a id="si7021_read"></a>
-##read()
-####Description
-Read temperature and humidity from si7021.<br />
-
-####Syntax
-read()
-
-####Parameters
-nil.<br />
-
-####Returns
-nil(Why?).<br />
-
-####Example
-```lua
-si7021 = require("si7021")
-sda = 1
-scl = 2
-si7021.init(sda, scl)
-r = si7021.read()
-print(r)
--- Don't forget to release it after use
-si7021 = nil
-package.loaded["si7021"]=nil
-```
-
-####See also
-**-**   []()
-
-<a id="si7021_getHumidity"></a>
-##getHumidity()
-####Description
-Get humidity from si7021.<br />
-
-####Syntax
-getHumidity()
-
-####Parameters
-nil.<br />
-
-####Returns
-h: Integer, humidity from si7021.
-
-####Example
-```lua
-si7021 = require("si7021")
-sda = 1
-scl = 2
-si7021.init(sda, scl)
-h = si7021.getHumidity()
-print(h)
--- Don't forget to release it after use
-si7021 = nil
-package.loaded["si7021"]=nil
-```
-
-####See also
-**-**   []()
-
-<a id="si7021_getTemperature"></a>
-##getTemperature()
-####Description
-Get temperature from si7021.<br />
-
-####Syntax
-getTemperature()
-
-####Parameters
-nil.<br />
-
-####Returns
-t: Integer, temperature from si7021.
-
-####Example
-```lua
-si7021 = require("si7021")
-sda = 1
-scl = 2
-si7021.init(sda, scl)
-t = si7021.getTemperature()
-print(t)
--- Don't forget to release it after use
-si7021 = nil
-package.loaded["si7021"]=nil
-```
-
-####See also
-**-**   []()
diff --git a/lua_modules/si7021/si7021.lua b/lua_modules/si7021/si7021.lua
deleted file mode 100644
index 161e57d2..00000000
--- a/lua_modules/si7021/si7021.lua
+++ /dev/null
@@ -1,104 +0,0 @@
--- ***************************************************************************
--- SI7021 module for ESP8266 with nodeMCU
--- Si7021 compatible tested 2015-1-22
---
--- Written by VIP6
---
--- MIT license, http://opensource.org/licenses/MIT
--- ***************************************************************************
-
-local moduleName = ...
-local M = {}
-_G[moduleName] = M
-
---I2C slave address of Si70xx
-local Si7021_ADDR = 0x40
-
---Commands
-local CMD_MEASURE_HUMIDITY_HOLD = 0xE5
-local CMD_MEASURE_HUMIDITY_NO_HOLD = 0xF5
-local CMD_MEASURE_TEMPERATURE_HOLD = 0xE3
-local CMD_MEASURE_TEMPERATURE_NO_HOLD = 0xF3
-
-
--- temperature and pressure
-local t,h
-
-local init = false
-
--- i2c interface ID
-local id = 0
-
--- 16-bit  two's complement
--- value: 16-bit integer
-local function twoCompl(value)
- if value > 32767 then value = -(65535 - value + 1)
- end
- return value
-end
-
-
-
--- read data from si7021
--- ADDR: slave address
--- commands: Commands of si7021
--- length: bytes to read
-local function read_data(ADDR, commands, length)
-  i2c.start(id)
-  i2c.address(id, ADDR, i2c.TRANSMITTER)
-  i2c.write(id, commands)
-  i2c.stop(id)
-  i2c.start(id)
-  i2c.address(id, ADDR,i2c.RECEIVER)
-  tmr.delay(20000)
-  c = i2c.read(id, length)
-  i2c.stop(id)
-  return c
-end
-
--- initialize module
--- sda: SDA pin
--- scl SCL pin
-function M.init(sda, scl)
-  i2c.setup(id, sda, scl, i2c.SLOW)
-  --print("i2c ok..")
-  init = true
-end
-
--- read humidity from si7021
-local function read_humi()
-  dataH = read_data(Si7021_ADDR, CMD_MEASURE_HUMIDITY_HOLD, 2)
-  UH = string.byte(dataH, 1) * 256 + string.byte(dataH, 2)
-  h = ((UH*12500+65536/2)/65536 - 600)
-  return(h)
-end
-
--- read temperature from si7021
-local function read_temp()
-  dataT = read_data(Si7021_ADDR, CMD_MEASURE_TEMPERATURE_HOLD, 2)
-  UT = string.byte(dataT, 1) * 256 + string.byte(dataT, 2)
-  t = ((UT*17572+65536/2)/65536 - 4685)
-  return(t)
-end
-
--- read temperature and humidity from si7021
-function M.read()
-  if (not init) then
-     print("init() must be called before read.")
-  else
-	 read_humi()
-	 read_temp()
-  end
-end;
-
--- get humidity
-function M.getHumidity()
-  return h
-end
-
--- get temperature
-function M.getTemperature()
-  return t
-end
-
-return M