initial commit

[submodule "ext/ssd1306"]

	path = ext/ssd1306

	url = https://github.com/derf/esp8266-nodemcu-ssd1306.git

[submodule "ext/mh-z19"]

	path = ext/mh-z19

	url = https://github.com/derf/esp8266-nodemcu-mh-z19.git

Subproject commit 4b0115c6f5d80d416ac4e84e679a4790f88ed6f6

Subproject commit 3ac749b83cf218ab151ae1ca72badd41eaf0cc49

../ext/ssd1306/framebuffer.lua

 No newline at end of file

chip_id = string.format("%06X", node.chipid())

device_id = "esp8266_" .. chip_id

mqtt_prefix = "sensor/" .. device_id

mqttclient = mqtt.Client(device_id, 120)

dofile("config.lua")

i2c.setup(0, 5, 6, i2c.SLOW)

ssd1306 = require("ssd1306")

fn = require("terminus16")

fb = require("framebuffer")

mh_z19 = require("mh-z19")

ledpin = 4

gpio.mode(ledpin, gpio.OUTPUT)

gpio.write(ledpin, 0)

ssd1306.init(128, 32)

ssd1306.contrast(128)

fb.init(128, 32)

no_wifi_count = 0

publish_count = 0

publishing_mqtt = false

function connect_wifi()

	print("Connecting to ESSID " .. station_cfg.ssid)

	wifi.eventmon.register(wifi.eventmon.STA_GOT_IP, wifi_connected)

	wifi.eventmon.register(wifi.eventmon.STA_DHCP_TIMEOUT, wifi_err)

	wifi.eventmon.register(wifi.eventmon.STA_DISCONNECTED, wifi_err)

	wifi.setmode(wifi.STATION, false)

	wifi.sta.config(station_cfg)

	wifi.sta.connect()

end

function init_mhz19()

	port = softuart.setup(9600, 1, 2)

	port:on("data", 9, uart_callback)

	poll = tmr.create()

	poll:register(5 * 1000, tmr.ALARM_AUTO, query_mhz19)

	poll:start()

	query_mhz19()

	gpio.write(ledpin, 1)

end

function query_mhz19()

	port:write(mh_z19.c_query)

end

function uart_callback(data)

	fb.init(128, 32)

	if not mh_z19.parse_frame(data) then

		fb.print(fn, "MH-Z19 error")

		ssd1306.show(fb.buf)

		return

	end

	local line1 = string.format("%8d ppm\n", mh_z19.co2)

	local line2 = string.format("%8d c\n", mh_z19.temp)

	fb.print(fn, line1)

	fb.print(fn, line2)

	if have_wifi then

		fb.y = 16

		fb.x = 100

		fb.print(fn, string.format("%d", wifi.sta.getrssi()))

	else

		if no_wifi_count == 5 then

			wifi.setmode(wifi.NULLMODE, false)

		end

		if no_wifi_count < 24 then

			no_wifi_count = no_wifi_count + 1

		else

			no_wifi_count = 0

			connect_wifi()

		end

	end

	ssd1306.show(fb.buf)

	fb.init(128, 32)

	publish_count = publish_count + 1

	if have_wifi and publish_count >= 4 and not publishing_mqtt then

		publish_count = 0

		publishing_mqtt = true

		gpio.write(ledpin, 0)

		local json_str = string.format('{"rssi_dbm":%d,"co2_ppm":%d,"temperature_celsius":%d}', wifi.sta.getrssi(), mh_z19.co2, mh_z19.temp)

		mqttclient:publish(mqtt_prefix .. "/data", json_str, 0, 0, function(client)

			publishing_mqtt = false

			gpio.write(ledpin, 1)

			collectgarbage()

		end)

	else

		collectgarbage()

	end

end

function wifi_connected()

	print("IP address: " .. wifi.sta.getip())

	have_wifi = true

	no_wifi_count = 0

	print("Connecting to MQTT " .. mqtt_host)

	mqttclient:on("connect", hass_register)

	mqttclient:on("offline", wifi_err)

	mqttclient:lwt(mqtt_prefix .. "/state", "offline", 0, 1)

	mqttclient:connect(mqtt_host)

end

function wifi_err()

	have_wifi = false

end

function hass_register()

	local hass_device = string.format('{"connections":[["mac","%s"]],"identifiers":["%s"],"model":"ESP8266 + MH-Z19","name":"MH-Z19 %s","manufacturer":"derf"}', wifi.sta.getmac(), device_id, chip_id)

	local hass_entity_base = string.format('"device":%s,"state_topic":"%s/data","expire_after":120', hass_device, mqtt_prefix)

	local hass_co2 = string.format('{%s,"name":"CO₂","object_id":"%s_co2","unique_id":"%s_co2","device_class":"carbon_dioxide","unit_of_measurement":"ppm","value_template":"{{value_json.co2_ppm}}"}', hass_entity_base, device_id, device_id)

	local hass_temp = string.format('{%s,"name":"Temperature","object_id":"%s_temp","unique_id":"%s_temp","device_class":"temperature","unit_of_measurement":"°c","value_template":"{{value_json.temperature_celsius}}","entity_category":"diagnostic"}', hass_entity_base, device_id, device_id)

	local hass_rssi = string.format('{%s,"name":"RSSI","object_id":"%s_rssi","unique_id":"%s_rssi","device_class":"signal_strength","unit_of_measurement":"dBm","value_template":"{{value_json.rssi_dbm}}","entity_category":"diagnostic"}', hass_entity_base, device_id, device_id)

	publishing_mqtt = true

	mqttclient:publish("homeassistant/sensor/" .. device_id .. "/co2/config", hass_co2, 0, 1, function(client)

		mqttclient:publish("homeassistant/sensor/" .. device_id .. "/temperature/config", hass_temp, 0, 1, function(client)

			mqttclient:publish("homeassistant/sensor/" .. device_id .. "/rssi/config", hass_rssi, 0, 1, function(client)

				mqttclient:publish(mqtt_prefix .. "/state", "online", 0, 1, function(client)

					publishing_mqtt = false

					print("Registered with Home Assistant")

					collectgarbage()

				end)

			end)

		end)

	end)

end

print("WiFi MAC: " .. wifi.sta.getmac())

init_mhz19()

connect_wifi()