initial commit

wifi.lua

# Umweltsensoren im Chaosdorf

Siehe [Sensorium](https://wiki.chaosdorf.de/Sensorium).

# ESP8266-Sensoren mit HDC1080 u.ä.

init.lua differenziert anhand der Chip-ID zwischen den im Clubraum verteilten Boards und ihren verschiedenen Sensoren.

Vor dem Flashen muss wifi.lua erstellt und mit den WLAN-Zugangsdaten befüllt werden:

```

station_cfg.ssid = "..."

station_cfg.pwd = "..."

```

## Flashen

```

nodemcu-uploader.py upload *.lua

```

Anschließend den Resetknopf drücken -- oder für einfacheres Debugging per `screen` o.ä. mit dem Gerät verbinden und `node.restart()` eintippen.

-- nodemcu-release-13-modules-2022-04-12-17-11-54-integer.bin

-- 20 .. 70 mA @ 5V

station_cfg = {}

dofile("wifi.lua")

mqtt_host = 'mqtt.chaosdorf.space'

delayed_restart = tmr.create()

push_timer = tmr.create()

chipid = node.chipid()

mqtt_prefix = "sensor/esp8266_" .. chipid

mqttclient = mqtt.Client("dmap_esp8266_" .. chipid, 120)

print("https://wiki.chaosdorf.de/tbd")

print("ESP8266 " .. chipid)

gpio.mode(4, gpio.OUTPUT)

gpio.write(4, 0)

have_am2320 = true

have_bme680 = false

have_hdc1080 = false

have_lm75 = false

have_photoresistor = true

pin_sda = 1

pin_scl = 2

-- 1417026, 482757 -> default

if chipid == 1259750 then

	have_photoresistor = false

	have_am2320 = false

	have_hdc1080 = true

elseif chipid == 1416820 then

	pin_sda = 2

	pin_scl = 1

elseif chipid == 1417132 then

	have_am2320 = false

	have_hdc1080 = true

elseif chipid == 2652641 then

	have_am2320 = false

	have_lm75 = true

	pin_sda = 5

	pin_scl = 6

elseif chipid == 2652764 then

	have_am2320 = false

	have_hdc1080 = true

	pin_sda = 5

	pin_scl = 6

elseif chipid == 2652549 then

	have_am2320 = false

	have_bme680 = true

	pin_sda = 5

	pin_scl = 6

end

i2c.setup(0, pin_sda, pin_scl, i2c.SLOW)

if have_am2320 then

	am2320.setup()

end

if have_bme680 then

	bme680.setup()

end

if have_hdc1080 then

	hdc1080.setup()

end

if have_lm75 then

	i2c.start(0)

	if not i2c.address(0, 0x4f, i2c.TRANSMITTER) then

		print("LM75 not found")

	end

	i2c.write(0, 1, 0)

	i2c.stop(0)

end

function read_lm75()

	local got_error = false

	i2c.start(0)

	if not i2c.address(0, 0x4f, i2c.TRANSMITTER) then

		got_error = true

	end

	i2c.write(0, 0)

	i2c.stop(0)

	i2c.start(0)

	if not i2c.address(0, 0x4f, i2c.RECEIVER) then

		got_error = true

	end

	local ret = i2c.read(0, 2)

	i2c.stop(0)

	if got_error then

		return "null"

	end

	return string.format("%d.%01d", string.byte(ret, 1), string.byte(ret, 2) * 4 / 100)

end

function push_data()

	local brightness = adc.read(0)

	local json_str = '{'

	if have_bme680 then

		local T, P, H, G, QNH = bme680.read()

		if T ~= nil then

			json_str = json_str .. string.format('"temperature_celsius": %d.%02d, "humidity_relpercent": %d.%03d, "pressure_hpa": %d.%02d, "gas_ohm": %d, ', T/100, T%100, H/1000, H%1000, P/100, P%100, G)

		end

		bme680.startreadout()

	elseif have_am2320 then

		local am_rh, am_t = am2320.read()

		json_str = json_str .. string.format('"temperature_celsius": %d.%01d, "humidity_relpercent": %d.%01d, ', am_t/10, am_t%10, am_rh/10, am_rh%10)

	elseif have_hdc1080 then

		local t, h = hdc1080.read()

		json_str = json_str .. string.format('"temperature_celsius": %.1f, "humidity_relpercent": %.1f, ', t, h)

	elseif have_lm75 then

		local str_temp = read_lm75()

		json_str = json_str .. '"temperature_celsius": ' .. str_temp .. ', '

	end

	if have_photoresistor then

		json_str = json_str .. string.format('"brightness_percent": %d.%01d, ', brightness/10, brightness%10)

	end

	json_str = json_str .. '"rssi_dbm": ' .. wifi.sta.getrssi() .. '}'

	print("Publishing " .. json_str)

	mqttclient:publish("sensor/esp8266_" .. chipid .. "/data", json_str, 0, 0, function(client)

		print("Naptime")

		collectgarbage()

	end)

	push_timer:start()

end

function log_restart()

	print("Network error " .. wifi.sta.status() .. ". Restarting in 20 seconds.")

	delayed_restart:start()

end

function setup_client()

	gpio.write(4, 1)

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

		push_data()

	end)

end

function connect_mqtt()

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

	print("Connecting to MQTT " .. mqtt_host)

	delayed_restart:stop()

	mqttclient:on("connect", setup_client)

	mqttclient:on("offline", log_restart)

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

	mqttclient:connect(mqtt_host)

end

function connect_wifi()

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

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

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

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

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

	wifi.setmode(wifi.STATION)

	wifi.sta.config(station_cfg)

	wifi.sta.connect()

end

delayed_restart:register(20 * 1000, tmr.ALARM_SINGLE, node.restart)

push_timer:register(60 * 1000, tmr.ALARM_SEMI, push_data)

connect_wifi()