1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
station_cfgs = {}
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)
wifi_index = 1
no_wifi_count = 0
publish_count = 0
-- 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 connect_wifi()
print("WiFi MAC: " .. wifi.sta.getmac())
print("Connecting to ESSID " .. station_cfgs[wifi_index].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_cfgs[wifi_index])
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()
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", 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.y = 16
fb.print(fn, line1)
fb.print(fn, line2)
fb.draw_battery_8(114, 0, bat_p)
if have_wifi then
fb.x = 100
fb.print(fn, string.format("%d", wifi.sta.getrssi()))
else
if no_wifi_count == 5 then
wifi_index = (wifi_index % table.getn(station_cfgs)) + 1
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, 64)
publish_count = publish_count + 1
if have_wifi and influx_url and publish_count >= 4 and not publishing_http then
publish_count = 0
publish_influx(co2, raw_temp, raw_humi, bat_mv)
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
collectgarbage()
end)
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
no_wifi_count = 0
end
function wifi_err()
have_wifi = false
end
connect_wifi()
|
