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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
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(128)
fb.init(128, 64)
wifi_index = 1
no_wifi_count = 0
publish_count = 0
past_pos = 1
past = {}
-- 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("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()
if publishing_http then
return
end
local co2, raw_temp, raw_humi = scd4x.read()
local bat_mv = get_battery_mv()
local bat_p = get_battery_percent(bat_mv)
fb.init(128, 64)
fb.draw_battery_8(0, 0, bat_p)
if have_wifi then
fb.x = 96
fb.y = 16
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
fb.x = 0
fb.y = 16
if co2 == nil then
fb.print(fn, "SCD4x error")
ssd1306.show(fb.buf)
fb.init(128, 64)
collectgarbage()
return
end
fb.x = 16
fb.print(fn, string.format("%5d ppm", co2))
fb.x = 16
fb.y = 0
fb.print(fn, string.format("%4d.%d c %3d.%d %%", raw_temp/65536 - 45, (raw_temp%65536)/6554, raw_humi/65536, (raw_humi%65536)/6554))
past[past_pos] = (co2 - 400) / 50
past[past_pos] = past[past_pos] >= 0 and past[past_pos] or 0
past[past_pos] = past[past_pos] <= 31 and past[past_pos] or 31
past_pos = (past_pos) % 128 + 1
for i = 1, 128 do
fb.buf[i * 2] = bit.lshift(1, 31 - (past[(past_pos + (i-2)) % 128 + 1] or 0))
end
ssd1306.show(fb.buf)
fb.init(128, 64)
collectgarbage()
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)
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)
collectgarbage()
publishing_http = false
end)
end)
end
local init_t = tmr.create()
init_t:register(1 * 1000, tmr.ALARM_SINGLE, scd4x_start)
init_t:start()
function wifi_connected()
print("Connected")
have_wifi = true
no_wifi_count = 0
end
function wifi_err()
have_wifi = false
end
print("WiFi MAC: " .. wifi.sta.getmac())
connect_wifi()
|
