Unverified Commit 7e8ada78 authored by Birte Kristina Friesel's avatar Birte Kristina Friesel
Browse files

Show a plot of past 128 readings in the bottom half of the OLED

parent 3c8a52e9

src/init.lua

+31 −16
Original line number Diff line number Diff line
@@ -16,13 +16,16 @@ gpio.mode(ledpin, gpio.OUTPUT) 
gpio.write(ledpin, 0)



ssd1306.init(128, 64)

ssd1306.contrast(255)

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)
@@ -68,22 +71,11 @@ function measure() 
	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)



	fb.draw_battery_8(0, 0, bat_p)

	if have_wifi then

		fb.x = 100

		fb.x = 96

		fb.y = 16

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

	else

		if no_wifi_count == 5 then
@@ -97,6 +89,29 @@ function measure() 
			connect_wifi()

		end

	end



	fb.x = 0

	fb.y = 16

	if co2 == nil then

		fb.print(fn, "SCD4x error")

		ssd1306.show(fb.buf)

		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) / 64

	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)

	publish_count = publish_count + 1