diff options
| author | Birte Kristina Friesel <derf@finalrewind.org> | 2024-01-11 21:30:14 +0100 |
|---|---|---|
| committer | Birte Kristina Friesel <derf@finalrewind.org> | 2024-01-11 21:30:14 +0100 |
| commit | 7e8ada78b865cb286fb178945d1339b1f21cd25b (patch) | |
| tree | 6d8662af2a2ccc5be7eb553f857f2e6052656a39 | |
| parent | 3c8a52e9df6bbd08c1d66064ffdb2b51d883b2a2 (diff) | |
Show a plot of past 128 readings in the bottom half of the OLED
| -rw-r--r-- | src/init.lua | 47 |
1 files changed, 31 insertions, 16 deletions
diff --git a/src/init.lua b/src/init.lua index d2e8cef..8e81ca1 100644 --- a/src/init.lua +++ b/src/init.lua @@ -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 |