first commit

.gitignore

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+location.lua

README.md

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+#Blinkmeter
+
+Electricity meter blink counter nodemcu lua code for ESP8266.
+
+## What it does:
+- Upon starting it establishes connection to provided wifi ssid
+- It counts electricity meter flashes and stores them in counter variable
+- It opens a socket and exposes counter.
+- Once prometheus scrapes the value, counter gets reset to 0.
+
+## Installation
+
+### Download nodemcu firmware
+- I use this site to build custom nodemcu firmware: [nodency-build,com](https://nodemcu-build.com)
+
+### Flash your ESP8266 controller
+```bash $ esptool.py --port /dev/ttyUSB0 --baud 115200 write_flash --flash_size=detect 0 /path/to/nodemcu.bin ```
+
+### Download ESPlorer
+- You can get it at [Esplorer site](https://esp8266.ru/esplorer/)
+- Extract and launch with java 1.7+ ```bash $ java -jar ESPlorer.jar```
+
+### Upload lua files
+- move location_example.lua to location.lua and change to your ssid/psk
+- upload files through esplorer.

application.lua

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+dofile("counter.lua")
+dofile("blinkDetector.lua")
+
+local counter = Counter
+local blinkDetector = BlinkDetector
+
+function countBlinks()
+    local value = adc.read(0)
+    if blinkDetector:isBlinking(value) then
+        counter:increment()
+    end
+end
+
+function metrics()
+    local buffer = {"# TYPE watts gauge\n", "watts ", counter:get(), "\n"}
+    local body = table.concat(buffer)
+    counter:reset()
+    return body
+end
+
+function response()
+  local header = "HTTP/1.1 200 OK\r\nServer: NodeMCU on ESP8266\r\nContent-Type: text/plain; version=0.0.4\r\n\r\n"
+  local response = header .. metrics()
+  print("> " .. response)
+  return response
+end
+
+-- Initiate blink counting thread
+tmr.create():alarm(10, tmr.ALARM_AUTO, countBlinks)
+
+srv = net.createServer(net.TCP, 20) -- 20s timeout
+
+if srv then
+  srv:listen(80, function(conn)
+    conn:on("receive", function(conn, data)
+      print("< "  .. data)
+      conn:send(response(), function(finishConn)
+        finishConn:close()
+        end)
+    end)
+  end)
+end

blinkDetector.lua

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+dofile("counter.lua")
+
+BlinkDetector = {
+    ON_THRESHOLD = 200,
+    OFF_THRESHOLD = 100,
+    ON = 1,
+    OFF = 0,
+    state = 0
+}
+
+function BlinkDetector:isBlinking(value)
+    if self.state == self.ON and value < self.OFF_THRESHOLD then
+        self.state = self.OFF
+        return true
+    end
+    if value > self.ON_THRESHOLD then
+        self.state = self.ON
+    end
+    return false
+end

counter.lua

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+Counter = {counter = 0}
+function Counter:increment()
+    self.counter = self.counter + 1
+end
+
+function Counter:reset()
+    self.counter = 0
+end
+
+function Counter:get()
+    return self.counter
+end

init.lua

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+-- load location specific data 'altitude', 'ssid' and 'wifipassword'
+dofile("location.lua")
+
+function startup()
+    if file.open("init.lua") == nil then
+        print("init.lua deleted or renamed")
+    else
+        print("Running")
+        file.close("init.lua")
+        -- the actual application is stored in 'application.lua'
+        dofile("application.lua")
+    end
+end
+
+function read()
+    print("Reading value")
+end
+
+function flushing()
+    print("Flushing value")
+end
+
+print("Connecting to WiFi access point...")
+wifi.setmode(wifi.STATION)
+station_cfg={}
+station_cfg.ssid=ssid
+station_cfg.pwd=wifipassword
+wifi.sta.config(station_cfg)
+    print("Connected to wifi:" .. ssid)
+-- wifi.sta.connect() not necessary because config() uses auto-connect=true by default
+tmr.create():alarm(1000, tmr.ALARM_AUTO, function(cb_timer)
+    if wifi.sta.getip() == nil then
+        print("Waiting for IP address...")
+    else
+        cb_timer:unregister()
+        print("WiFi connection established, IP address: " .. wifi.sta.getip())
+        print("You have 3 seconds to abort")
+        print("Waiting...")
+        tmr.create():alarm(3000, tmr.ALARM_SINGLE, startup)
+    end
+end)

location_example.lua

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+ssid = "rearcrack"
+wifipassword = "DoNotEnter"