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station_cfg = {}
chip_id = string.format("%06X", node.chipid())
device_id = "esp8266_" .. chip_id
dofile("config.lua")
i2c.setup(0, 1, 2, i2c.SLOW)
ssd1306 = require("ssd1306")
fn = require("terminus16")
fb = require("framebuffer")
scd4x = require("scd4x")
ledpin = 4
gpio.mode(ledpin, gpio.OUTPUT)
gpio.write(ledpin, 0)
ssd1306.init(128, 64)
ssd1306.contrast(255)
fb.init(128, 64)
timestamp = 0
old_timestamp = 0
no_wifi_count = 0
publish_count = 0
message_queue = {}
-- cal 2023-01-06
-- 4.2V -> "4.36V" (raw ~ 948)
-- 4.0V -> "4.16V" (raw ~ 905)
-- 3.8V -> "3.95V" (raw ~ 859)
-- 3.6V -> "3.74V" (raw ~ 814)
function get_battery_mv()
return adc.read(0) * 461 / 104
end
function get_battery_percent(bat_mv)
if bat_mv > 4160 then
return 100
end
if bat_mv < 3360 then
return 0
end
return (bat_mv - 3360) / 8
end
function get_time()
publishing_http = true
http.get("http://arclight:1234/", nil, function(status, body, headers)
publishing_http = false
if timestamp < 604800 then
old_timestamp = timestamp
end
timestamp = tonumber(body)
end)
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, 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)
wifi.sta.config(station_cfg)
wifi.sta.connect()
end
function scd4x_start()
if scd4x.start() then
gpio.write(ledpin, 1)
else
print("SCD4x error")
end
local measure_t = tmr.create()
measure_t:register(5 * 1000, tmr.ALARM_AUTO, measure)
measure_t:start()
end
function measure()
timestamp = timestamp + 5
fb.init(128, 64)
local co2, raw_temp, raw_humi = scd4x.read()
local bat_mv = get_battery_mv()
local bat_p = get_battery_percent(bat_mv)
local line1 = ""
local line2 = ""
if co2 == nil then
line1 = "SCD4x error"
fb.print(fn, line1)
ssd1306.show(fb.buf)
return
end
line1 = string.format("%8d ppm\n\n", co2)
line2 = string.format("%8d.%d c\n%8d.%d %%", raw_temp/65536 - 45, (raw_temp%65536)/6554, raw_humi/65536, (raw_humi%65536)/6554)
fb.print(fn, line1)
fb.print(fn, line2)
fb.draw_battery_8(114, 0, bat_p)
if have_wifi then
fb.x = 90
fb.print(fn, string.format("%02d:%02d", (timestamp / 3600) % 24, (timestamp / 60) % 60))
elseif no_wifi_count < 120 then
no_wifi_count = no_wifi_count + 1
else
table.insert(message_queue, {timestamp, co2, raw_temp, raw_humi})
fb.x = 100
fb.print(fn, string.format("%d", table.getn(message_queue)))
no_wifi_count = 0
connect_wifi()
end
ssd1306.show(fb.buf)
fb.init(128, 64)
publish_count = publish_count + 1
if have_wifi and influx_url and publish_count >= 4 and not publishing_http then
publish_count = 0
gpio.write(ledpin, 0)
publish_influx(co2, raw_temp, raw_humi, bat_mv)
elseif have_wifi and influx_url and not publishing_http and timestamp > 604800 then
for i, v in ipairs(message_queue) do
if v[1] < 604800 then
v[1] = timestamp - (old_timestamp - v[1])
end
end
--print(timestamp)
empty_queue(message_queue)
else
collectgarbage()
end
end
function publish_influx(co2, raw_temp, raw_humi, bat_mv)
publishing_http = true
http.post(influx_url, influx_header, string.format("scd4x%s co2_ppm=%d,temperature_celsius=%d.%d,humidity_relpercent=%d.%d", influx_attr, co2, raw_temp/65536 - 45, (raw_temp%65536)/6554, raw_humi/65536, (raw_humi%65536)/6554), function(code, data)
http.post(influx_url, influx_header, string.format("esp8266%s battery_mv=%d", influx_attr, bat_mv), function(code, data)
publishing_http = false
gpio.write(ledpin, 1)
get_time()
collectgarbage()
end)
end)
end
function empty_queue(q)
local n = table.getn(q)
if n > 0 then
publishing_http = true
gpio.write(ledpin, 0)
local ts = q[n][1]
local co2 = q[n][2]
local t = q[n][3]
local h = q[n][4]
table.remove(q)
--print(influx_url .. '&precision=s')
--print(string.format("scd4x%s co2_ppm=%d,temperature_celsius=%d.%d,humidity_relpercent=%d.%d %d", influx_attr, co2, t/65536 - 45, (t%65536)/6554, h/65536, (h%65536)/6554, ts))
http.post(influx_url .. '&precision=s', influx_header, string.format("scd4x%s co2_ppm=%d,temperature_celsius=%d.%d,humidity_relpercent=%d.%d %d", influx_attr, co2, t/65536 - 45, (t%65536)/6554, h/65536, (h%65536)/6554, ts), function(code, data)
--print('Q ' .. n .. ' returned ' .. code .. ' ' .. data)
empty_queue(q)
end)
else
publishing_http = false
gpio.write(ledpin, 1)
end
end
local init_t = tmr.create()
init_t:register(1 * 1000, tmr.ALARM_SINGLE, scd4x_start)
init_t:start()
function wifi_connected()
have_wifi = true
end
function wifi_err()
have_wifi = false
end
connect_wifi()
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