Meteo P4

Technical User Manual

Platform: ESP32-P4 + ESP32-C6

Firmware: p4 22.31.0641

Display: JC1060P470C 1024×600 MIPI-DSI

SDK: ESP-IDF 6.0.1 / LVGL v9

Device Overview

Meteo P4 is a multifunction weather station based on the ESP32-P4. The device displays data from internal and external sensors, GNSS coordinates, an aviation-grade weather forecast, a clock synchronised via satellites and NTP, and also plays audio from an SD card and internet radio.

Technical Specifications

Parameter	Value
Main processor	ESP32-P4, 2 cores, up to 360 MHz
Wi-Fi / Bluetooth	ESP32-C6 (separate chip, ESP-Hosted over SDIO)
Flash memory	16 MB (DIO, 40 MHz)
PSRAM	32 MB (HEX, 200 MHz)
Display	JC1060P470C, 1024×600 px, MIPI-DSI, 2 data lanes
Touchscreen	GT911 (I2C)
Audio codec	ES8311 (I2C + I2S)
SD card	SDMMC 4-bit, FAT32 with LFN
GNSS	UART, 38400/9600/57600/115200 baud (auto-detect)
RS485 (external sensors)	Modbus RTU, 9600 baud, half-duplex
Internal sensors	I2C bus: SHT41, BME280/BMP280, SCD41, SGP41, INA226

Connection Diagram

Connectors and components of the JC-ESP32P4-M3 board

The image below labels all connectors and control elements on the board (rear view).

#	Label	Purpose in Meteo P4
1	BOOT button	Enter flashing mode (hold during reset)
2	Reset button	Reboot the device
3	MX 1.25 2P — Speaker	Speaker connection (ES8311 audio output)
4	TF card slot	microSD card (FAT32) — sensor logs, audio files
5	MX 1.25 2P — Li-Battery	Lithium battery (3.7 V, charge monitoring via INA226)
6	Battery button	Switch on power from the battery
7	Full-speed Type-C	USB Full-Speed — firmware flashing (esptool), Serial/JTAG debug
8	MX 1.25 4P — UART1	GNSS module (TX/RX/3.3V/GND). GPIO37=TX, GPIO38=RX
9	High-speed Type-C	USB High-Speed (ESP32-P4 native USB)
10	MX 1.25 4P — UART	Auxiliary UART (spare / debug)
11	MX 1.25 4P — RS-485	RS-485 bus (A+/B−/3.3V/GND) — outdoor SHT30 and anemometer
12	SH 1.0 4P — I2C	I2C bus (SDA/SCL/3.3V/GND) — SHT41, BME280, SCD41, SGP41, INA226 sensors
13	100 Mbps Ethernet Port	Wired network (Ethernet 100Base-T)
14	RTC Battery Holder	CR2032 cell — real-time clock (RTC)
15	30P 0.5-FPC MIPI	JC1060P470C display cable (1024×600, MIPI-DSI) — do not disconnect
16	JC-ESP32P4-M3	Main module: ESP32-P4 + ESP32-C6 Wi-Fi, 32 MB PSRAM, 16 MB Flash
17	6P 0.5-FPC Touch	GT911 touchscreen cable (I2C) — do not disconnect
18	2×13 2.54 mm Pin Header	Expansion header (GPIO, power, SPI, etc.)

Functional connection diagram

  ┌─────────────────────────────────────────────────────────────────┐
  │                    JC-ESP32P4-M3 BOARD                          │
  │                                                                 │
  │  #12 SH1.0 I2C ─── SDA/SCL ──── SHT41   (0x44/0x45) T°/RH%   │
  │                            ──── BME280  (0x76)      P/T°/RH%  │
  │                            ──── SCD41   (0x62)      CO₂        │
  │                            ──── SGP41   (0x59)      VOC/NOx    │
  │                            ──── INA226  (0x40)      V/I/P      │
  │                                                                 │
  │  #8  MX1.25 UART1 ─── TX/RX ──── GNSS module (38400 baud)     │
  │  #11 MX1.25 RS485 ─── A+/B− ──── MAX485 ──┬── SHT30  (0x01)  │
  │                                            └── Anemometer(0x03)│
  │  #3  MX1.25 2P    ─────────────── Speaker (ES8311 audio)       │
  │  #5  MX1.25 2P    ─────────────── Li-Ion battery 3.7 V         │
  │  #4  TF slot      ─────────────── SD card (FAT32)              │
  │  #13 Ethernet     ─────────────── 100 Mbps network             │
  │  #7  Type-C FS    ─────────────── PC (flashing / debug)        │
  │  #15 FPC 30P      ─────────────── 1024×600 MIPI-DSI display    │
  │  #17 FPC 6P       ─────────────── GT911 touchscreen            │
  │  #14 CR2032       ─────────────── RTC (clock when powered off) │
  └─────────────────────────────────────────────────────────────────┘

Display and touchscreen cables (#15, #17) are connected at the factory. Do not disconnect them unless necessary — the FPC connectors are fragile.

Flashing over USB: use connector #7 (Full-speed Type-C). When flashing, hold the BOOT button (#1), then press Reset (#2), then release BOOT.

GPIO Assignments

GPIO	Purpose	Interface
`7`	I2C SDA — all internal sensors, GT911 touch, ES8311 audio	I2C
`8`	I2C SCL	I2C
`9`	I2S DOUT (audio output to ES8311)	I2S
`10`	I2S WS (Word Select)	I2S
`11`	PA Enable — power amplifier enable	GPIO
`12`	I2S BCLK / SCLK (Bit Clock)	I2S
`13`	I2S MCLK (Master Clock to ES8311)	I2S
`20`	GNSS PPS — pulse-per-second (interrupt on both edges, `GPIO_INTR_ANYEDGE`)	GPIO INT
`23`	Display backlight (LEDC PWM)	LEDC
`26`	RS485 TX (MAX485 input D)	UART3
`27`	RS485 RX (MAX485 output R)	UART3
`37`	GNSS TX (data from the GNSS module)	UART1
`38`	GNSS RX (commands to the GNSS module)	UART1
`39`	SD D0	SDMMC
`40`	SD D1	SDMMC
`41`	SD D2	SDMMC
`42`	SD D3	SDMMC
`43`	SD CLK	SDMMC
`44`	SD CMD	SDMMC
`48`	I2S DIN (audio input from the microphone)	I2S
`53`	Battery voltage measurement (ADC2 CH4, 100 kΩ / 140 kΩ divider)	ADC
`54`	ESP32-C6 reset (Wi-Fi co-processor, active-high)	GPIO

I2C Sensors (internal)

All internal sensors share a single I2C bus (GPIO7/8, 400 kHz). Polling every 2 seconds.

Sensor	Address	Measures	Units
SHT41	`0x44` or `0x45` (auto-detect)	Indoor air temperature, humidity	°C, %
BME280 (chip_id=0x60)	`0x76`	Atmospheric pressure, temperature, humidity	hPa, °C, %
BMP280 (chip_id=0x58)	`0x76`	Atmospheric pressure, temperature	hPa, °C
SCD41	`0x62`	CO₂ concentration	ppm
SGP41	`0x59`	VOC index, NOx index	1–500
INA226	`0x40`	Bus voltage, current, power (battery)	V, mA, mW

Auto-detection of the pressure sensor: the device automatically detects whether a BMP280 or BME280 is present by chip_id at startup. The first one found at address 0x76 is used.

RS485 Sensors (external)

External sensors connect via the RS485 bus (Modbus RTU, 9600 baud, half-duplex). A MAX485 or equivalent is used. Bus polarity: A(+) / B(−).

  Meteo P4               MAX485                 RS485 bus
  ──────────             ──────────             ──────────────
  GPIO26 TX ──────────── D (input)
  GPIO27 RX ──────────── R (output)              A (+) ────── Outdoor SHT30 (addr 0x01)
                         A ─────────────────────             ────── Anemometer   (addr 0x03)
                         B ─────────────────────
                         DE/RE ── hardware control            B (−) ────── ...

Device	Modbus address	Poll rate	Measures
SHT30 RS485 (outdoor)	`0x01`	5 seconds	Outdoor temperature and humidity
Anemometer	`0x03`	1 second	Wind speed (m/s), EMA filter α=0.35

RS485 connector pinout (#11, MX 1.25 4P)

Pin on the board	Wire colour	Purpose
GND	■ Green	Ground (common)
B	■ Yellow	RS485 B (−)
A	■ Black	RS485 A (+)
5V	■ Pink	Sensor power 5 V

RS485 cable length: a 5 m cable is included. The maximum allowed length at 9600 baud is up to 100 m. For runs longer than 50 m it is recommended to add a 120 Ω terminating resistor between A and B at the far end of the bus.

Outdoor T°/RH% SHT30 sensor (RS485, Modbus addr 0x01)

3-cup anemometer (RS485, Modbus addr 0x03)

Power and Battery

Battery measurement

The battery voltage is measured through a resistive divider on GPIO53 (ADC2, channel 4). The data is shown in the Battery tile on the Settings screen.

INA226 parameter	Value
Shunt resistor	0.100 Ω
Current LSB	0.1 mA
End-of-charge threshold	Current ≤ 20 mA AND voltage ≥ 4.10 V

Display power: the MIPI DPHY is powered from the internal LDO VO3 (2500 mV). Do not apply external power to the MIPI connector.

Screens are switched by swipes (horizontal gestures) and taps on control elements. Transition animation: 220 ms.

Transition map (swipes)

Current screen	Swipe left →	Swipe right ←
Main	Details (Sensors)	GNSS
Details (Sensors)	Player	Main
GNSS	Main	—
Charts	—	Details (Sensors)
Player	—	Details (Sensors)
Local Forecast	—	Settings
Hourly Forecast (5 days)	—	Main
Scenarios / Alarm	—	Main
Wi-Fi (networks)	—	Main
Wi-Fi (password entry)	—	Wi-Fi (networks)
Settings	—	Main
Service	—	Settings
Diagnostics	—	Settings
About	—	Settings
LED Indicators	—	Settings
Server (MQTT)	—	Settings

Skyview is not a separate screen. The orbital satellite animation and decorative star field are the lower part of the GNSS screen (976×154 px area below the coordinate tiles). Swipes in this area are handled as swipes on the GNSS screen.

Tap transitions

Icon ⚙ (gear) in the Main header → Settings
Wi-Fi chip in the Main header → Wi-Fi screen
"SCENARIO" chip in the Main header → Scenarios
Button ▶ in the "5-DAY FORECAST" block on the Main screen → Hourly Forecast (5 days)
A forecast day row → that day in the Hourly Forecast
Buttons "AIR" / "HUM." on the Sensors screen → Charts (corresponding page)
Control Center tiles → linked sub-screens (see Settings section)

Main Screen

Top bar (header)

METEO P4 — device name (orange chip, left edge)
City + satellites chip: GNSS N or city name from geocoding
SCENARIO chip — clickable, opens the Scenarios screen
⚙ chip (LV_SYMBOL_SETTINGS) — opens Settings
Battery chip (level icon) — status only, no link
Wi-Fi chip (icon) — opens the Wi-Fi screen
Bottom indicator row (10 items): WIFI · TIME · GNSS · WEATH. · FORE. · CO2 · IAQ · PRESS. · PLAYER · RISK

Left column — weather and sensors

Weather icon + "Weather data"
Outdoor temperature (large, °C)
Feels like + wind speed
City + source (GNSS)
OUTDOOR T° (RS485) / INDOOR T° (local)
HUM. OUTDOOR % (RS485) / HUM. INDOOR % (local)

Centre — clock and ventilation

Time HH:MM:SS (split-flap style, large digits)
Date: DD.MM.YYYY
Day of the week
Sync icons: 🏠 GNSS / 📶 NTP
VENTILATION card: status + CO₂/VOC/Pressure metrics
SUNRISE / SUNSET (time)

Right column — forecast and moon

Heading 5-DAY FORECAST + button ▶
5 rows: day of week + icon + wind direction and speed + MAX/MIN °C
Moon phase (icon + phase name)
Dates: Full Moon / New Moon

5-day forecast

The bottom of the screen contains 5 forecast rows. Each row shows:

Day of the week
Weather icon
Day / night temperature
Wind direction and speed

Tapping a row opens the Multi-day forecast with details.

The "Aviation forecast" button opens the aviation screen.

Pressure and trend

Pressure is shown in mmHg. Trends:

Text	Threshold
Rising fast	+3 hPa per 3 hours
Rising	+0.5 hPa per 3 hours
Stable	within ±0.5 hPa
Falling	−0.5 hPa per 3 hours
Falling fast	−3 hPa per 3 hours

Ventilation card

Based on CO₂, VOC and humidity, the device issues a ventilation recommendation for the room.

Moon phase

Shows the current phase, the date of the next full moon and new moon, as well as sunrise and sunset.

Sensor Details

Access: swipe left from the Main screen. Title: SENSORS. Buttons in the upper-right corner: AIR / HUM. / Main.

Top row — sensor tiles

Tile	Source	Unit	Quality assessment
CO₂	SCD41	ppm	Normal / Elevated / High / Critical
VOC	SGP41	index 1–500	normal / moderate / high
NOx	SGP41	index 1–500	clean / elevated
HUMIDITY	SHT41 / BME280	%	normal / dry / humid
OUTDOOR	RS485 SHT30	°C	source: RS485
INDOOR	SHT41 / BME280	°C	source: Local sensor

VENTILATION card

Composite recommendation based on CO₂, VOC, humidity and outdoor temperature — hysteresis-based, 6 levels (in priority order):

Level	Title	Trigger	Colour
1	Ventilate now	CO₂ critical (≥ 1400 ppm with hysteresis down to 1350)	Pink
2	Needs ventilation	VOC index high	Orange
3	Ventilation recommended	CO₂ warn (≥ 1000 ppm)	Orange
4	Reduce humidity	Indoor humidity above threshold	Orange / Cyan
5	Not needed now	Indoor air is dry	Cyan
6	Air is normal	All parameters within range	Green

Below the title — a hint with a concrete recommendation on ventilation duration (taking outdoor temperature into account: short in frost/heat, longer in normal conditions).

NOISE tile (below the main row)

A narrow horizontal strip titled NOISE with a scale (0–100) and a dB-index value. Data from the ES8311 microphone via the noise_meter component.

Barograph (PRESSURE | 12-HOUR BAROGRAPH)

Large current pressure value in mmHg + text trend ("pressure tendency" / "Stable" / "Rising" / "Falling" etc., see trend table on the Main screen).
Chart: 12-hour points with time markers (−12h / −10h / −8h / −6h / −4h / −2h / now). On the right: max 12h:, min 12h:, norm: (default value "750").

Navigation buttons

AIR → Charts screen, "Air" page (CO₂ / VOC / Wind)
HUM. → Charts screen, "Humidity" page
Main → Main screen

GNSS Screen

Access: swipe right from the Main screen. Screen header: METEO P4 chip (cyan), then a date/time segment --.-- --:--, the title GNSS in the centre, the DGPS: no/ready chip, the PPS: chip with two LED segments (blink each second), and the "Main" button.

Top bar — GNSS STATUS

Coloured fix dot (red → yellow → green) + large label "No fix" / "FIX 2D" / "FIX 3D" / "FIX DGPS"
FIX: -- — numeric fix type (NMEA)
Time: waiting / GNSS/PPS / NTP / none
Satellite icon (gnss_sync_sat_icon) + 5-segment signal-quality bar
Q -- — reception quality

Coordinate tiles

Tile	Content
LATITUDE	XX.XXXXXX° (decimal degrees)
LONGITUDE	XX.XXXXXX°
ACCURACY	~ X.X m (HDOP X.X)
ALTITUDE	XX.X m (above sea level)
SATELLITES	N (number in fix)

Lower three blocks

NAVIGATION

Ready / Not ready
N sats HDOP X.X

TIME

Source: GNSS/PPS / NTP / none
"System clock comes from GNSS/PPS"

LOCATION, SYSTEMS AND TIME

Location: city (from geocoding)
Systems: GPS / BeiDou / GLONASS / Galileo
System time + GNSS UTC

Lower part — Skyview (orbital animation)

Skyview — bottom part of the GNSS screen

Skyview is not a separate screen. It is the animated lower area of the GNSS screen (976×154 px, coordinates 24,424). There are no "< Data" / "GNSS | Skyview" buttons in the code.

Area contents:

Decorative star field (54 static stars of varying brightness)
Two animated "shooting stars" (meteors) with 38 px tails, looping with 9–11 s pauses
Real satellite icons (gnss_skyview_build / gnss_skyview_update), coloured by system

System colours (per gnss_skyview_ui code)

Colour	System
■ Blue	GPS (USA)
■ Red	GLONASS (Russia)
■ Green	Galileo (EU)
■ Orange	BeiDou (China)
■ Cyan	SBAS (differential correction)

HDOP scale (shown on the GNSS screen)

HDOP	Assessment	Colour
< 1.0	Excellent	Green
< 2.0	Good	Light blue
< 5.0	Acceptable	Yellow
≥ 5.0	Poor	Red

Local Forecast

Access: the "Local Forecast" tile in the Control Center (Settings). Actual screen title: LOCAL FORECAST.

All calculations are based on local sensors. The header shows the timestamp of the last calculation on the right: SENSORS --:--. Return — swipe right (to Settings).

Card A — CURRENT / ESTIMATE

UI label	Description
T	Air temperature (°C)
Td dew point	Dew point (°C) — temperature at which condensation begins
T-Td spread	T − Td difference: the smaller it is, the higher the chance of fog/clouds
RH	Relative humidity (%)
P0~	Sea-level pressure (mmHg) — QNH equivalent
Baro alt~	Barometric altitude (m) — PA equivalent
Density alt~	Density altitude (m) — DA equivalent
T − standard~	Deviation from the ISA standard atmosphere (°C)
Visibility~	Horizontal visibility (m or km)
Cloud base~	Cloud base height (m AGL) — ceiling equivalent

Card B — HAZARDS

Each hazard type is colour-coded:

Level	Colour	Meaning
NONE	Grey	No hazard
LOW	Green	Low risk
MODERATE	Yellow	Moderate risk
HIGH	Orange	High risk
SEVERE	Red	Hazardous conditions

The phenomena evaluated in code (8 rows): Fog / haze, Ice / frost, Thunderstorm, Wind / squall, Precipitation, Pressure drop, Heat / humidex, Warming / night. Below them — a separate row Visibility range~.

Card C — LOCAL FORECAST

Three horizons: Now / +1 h / +3 h. Compact rows with numeric values appear below the columns: for +1h — T / Td / Vis., for +3h — T / Vis. / Clouds.

Card D — MODEL

A narrow strip at the bottom: MODEL label, a summary text from the model (e.g. HH:MM | waiting for data) and on the right a Location: local marker or a geographic reference.

Full synthetic METAR and an airport database are not included in the current build — the section is simplified to "Location: local".

Card E — PRESSURE TREND (12 h)

Heading PRESSURE TREND (12 h). Numeric deltas: 1h: -- hPa, 3h: -- hPa. Text interpretation Waiting… / trend. 12-hour barograph with a sample roughly every 15 minutes.

"Windows by parts of the day" (Night / Morning / Day / Evening with category, visibility, ceiling, wind, risk) are not present in the current build.

Hourly Forecast (5 days)

Access: tap the ▶ button in the "5-DAY FORECAST" block on the Main screen, or tap a day row. Actual screen title: HOURLY FORECAST. The "Main" button in the upper-right corner returns.

Top row — day selector

5 tiles with weekdays and dates. The active day is highlighted with a blue border. Each tile: weekday, day, month, MIN/MAX temperature.

Lower panel — details of the selected day

Left block — day summary

City (from GNSS geoposition)
Weather icon
Maximum temperature (large)
Weekday and date
MIN / MAX temperature
Sunrise and Sunset
Short day description (text)

Right block — hourly table

8 columns: 00:00 / 03:00 / 06:00 / 09:00 / 12:00 / 15:00 / 18:00 / 21:00

Table rows:

Weather icons by hour
Temperature (°C)
Feels like (°C)
Pressure (mmHg)
Humidity (%)
Wind (direction / m/s)
Precipitation (%)

Charts

Access: the "Air charts" or "Humidity charts" buttons on the Details screen.

Filter buttons (top panel)

LIVE (cyan) — real-time data
SD 30d (orange) — 30-day history from the SD card (history_logger archive)
AIR (green) — CO₂, VOC, WIND m/s page
HUM. (blue) — humidity page
RESET (red) — clears accumulated data (opens a "Reset logs" confirmation dialog with YES / CANCEL buttons)
SENSORS (back) — return to the Sensors screen

Charts (AIR tab)

Chart	Colour	Shows	Above chart
CO₂	Green	CO₂ concentration (ppm)	min / max / now
VOC	Purple	VOC index (1–500)	min / max / now
WIND m/s	Yellow	Wind speed (RS485 anemometer)	min / max / now

Each chart: a line with points at samples, vertical dashed shadows, Y-axis auto-scaling. Data is stored in LP-SRAM (survives reboot), with backups in SPIFFS and on the SD card.

Media Player

Access: swipe left from the Sensors screen, or Settings → "Media" tile.

Header title: METEO P4 PLAYER (with double space). The BACK button is on the right. Two source modes — switched using the buttons in the top part of the left panel.

Left panel — status

Source buttons: SD CARD / WI-FI (active one highlighted)
"Art box" with a source icon (SD card or radio) and animated particle dots
STATUS heading + coloured dot + value: Stopped / Playing / Paused / Connecting / Loading / Error / Backend offline
Wi-Fi line: Wi-Fi offline or SSID/IP
QUEUE heading + large -- / -- (current track / total)
Track/folder subtitle (DOT truncation)

Sleep timer (SLEEP TIMER)

Buttons: 15 MIN, 30 MIN, 45 MIN, 1 HOUR, X (cancel; ASCII Latin X, not a Unicode cross)
"Sleep: off" line → "Sleep: MM:SS" (minutes:seconds countdown)
Repeat: off / track / folder

WI-FI RADIO mode

The header shows the number of stations: "Wi-Fi N stations". Right panel:

Type: WI-FI RADIO
Station name (large) and genre (Internet Radio)
Stream URL
Buffering progress bar

SD CARD mode

In the central header label (dynamic meta) — a folder counter. The right panel contains the Meta card:

Coloured source-type label: SD PLAYLIST
Large track title (with DOT truncation), artist subtitle, album label
Playback progress bar (left — current time 0:00, right — total 0:00) with an animated highlight
Playlist card with column headings: # / TITLE / ARTIST / TIME and a scrollable track list

Control buttons (common to both modes)

Button	Action
<<	Previous track / station
PLAY	Play / pause (large round orange button)
>>	Next track / station
STOP	Stop playback
REP	Repeat (off / track / folder)
MIX	Order mode (sequential / random)
- / +	Volume (ASCII minus/plus) — slider from 0 to 100
BACK	Return to the previous screen

Scenarios / Alarm

Access: the SCENARIO chip in the Main screen header. Header title: METEO P4 | SCENARIOS, in the centre — the current scenario name, on the right — clock --:-- and the BACK button.

Screen structure

Scenario tabs below the header: Scene 1 … Scene 4 (MAX_SCENARIOS=4).
Left editor card with two sub-tabs: MEDIA and BRIGHTNESS, plus an ON / OFF button on the right to activate the scenario.
Right card WEEKDAYS: 7 toggle buttons MO TU WE TH FR SA SU.
Bottom wide card ACTIVE — list of active scenarios (or the text "No active").

MEDIA panel

Large time display, -/+ buttons labelled HOUR and MIN
Audio source buttons: RADIO / SD CARD
SLEEP label and three sleep-timer buttons: 1 min, 10 min, 30 min

BRIGHTNESS panel

DAY profile (yellow): start time + brightness percentage (default 100%)
NIGHT profile (blue): start time + brightness percentage (default 25%)

Control Center (Settings)

Access: the ⚙ chip in the Main screen header, or swipe left from any settings sub-screen. Topbar: SETTINGS.

Hero block: heading "Device Control Center"
Hint: "Tiles show the current status of subsystems and lead to related screens."

First-row tiles (5 items)

Tile	Colour	Caption	Opens
Internet	Cyan	"Wi-Fi, network, API and time"	Wi-Fi screen
Media	Blue	"Player, sources and playback"	Player
Service	Orange	"GNSS, sensors and buses"	Service screen
Diagnostics	Green	"Errors, reset and status"	Diagnostics screen
Server	Cyan (0x26C6DA)	"MQTT telemetry"	MQTT screen

Second-row tiles (5 items)

Tile	Colour	Caption	Opens
Local Forecast	Yellow	"Weather, risks and visibility"	Local Forecast
Battery	Turquoise (0x2FE6C8)	"Power, charge and status"	— (status only)
LED Indicators	Cyan	"Status colours"	LED Indicators
GNSS	Purple	"Satellites, FIX and time"	GNSS screen
About	Light blue (0x8BC8FF)	"Information and licenses"	About

10 tiles (5×2), not 9. The Server tile leads to a separate MQTT screen (swipe right returns to Settings). The Local Forecast tile is named exactly that in the code, not "Aviation forecast".

Wi-Fi / Internet

Access: the Wi-Fi chip in the Main screen header, or the "Internet" tile in Settings. Screen header: INTERNET / WI-FI. On the left — the BACK button.

Left card — "Available networks"

Card heading: Available networks
List of SSIDs sorted by signal (number of rows is set by WIFI_UI_SCAN_ROWS)
Each row: * — protected network, SSID (DOT truncation), RSSI (dBm), 4-segment signal bar
RSSI colour thresholds (4 levels): ≥ -65 dBm (green), ≥ -75 (cyan), ≥ -85 (yellow), < -85 (red)
"Refresh" button in the upper-right corner — repeat scan

Right card — "Connection"

Card heading: Connection
Line 1: Wi-Fi: SSID | IP address or Wi-Fi: off
Line 2: RSSI: dBm (rating) | channel: N
Line 3: Auth: -- | PHY: -- | mode: STA
Two-line hint: "Select a network on the left" + "The password keyboard screen will open"
Status line: Ready to scan / Scanning…
"Turn off Wi-Fi" / "Turn on Wi-Fi" button (upper-right corner of the card; changes colour and text by state)

"Internet speed" card

Embedded in the right panel: heading Internet speed, "Network test" button in the top corner, and an arrow-style speedometer (LV scale, range 0–30 Mbps, 225° angle) with three colour zones:

Zone	Colour	Speed
Low speed	Red	0–10 Mbps
Normal speed	Blue	10–20 Mbps
High speed	Green	20+ Mbps

The "Network test" button starts the measurement. The result is shown as a digit (Mbps) and the arrow position.

Connecting to a network

Tap the desired network in the list on the left
The password entry screen opens with an on-screen keyboard
Enter the password (lower/upper case, digits and special characters available)
Press OK — the device will try to connect
Connection status is shown in the right panel

When you enter the Wi-Fi screen, scanning starts automatically. When you leave the screen, scanning stops.

Service Screen

Access: Settings → "Service" tile.

Caption at the bottom of the screen: "The screen updates automatically. Live and static hardware data of the board."

The screen consists of 16 tiles arranged in four rows of four. Each tile has a coloured border.

Row 1

Tile	Content
HARDWARE	MCU: ESP32-P4 rev.X, N cores Flash: 16 MB \| PSRAM: 27 MB Int RAM: XXX KB \| DMA: XXX KB
FIRMWARE	App: meteo_p4 N FW: p4 22.31.XXXX IDF: v6.0.1 Build: date and time of compilation
MEMORY	Heap: free/total KB, used Int: free/total KB \| DMA: XXX KB PSRAM: free/total KB
POWER	Vbat: XXX mV \| status (rest/charge/discharge) Pin ADC: XXX mV \| raw: XXXX Charge: X% \| cal: on/off

Row 2

Tile	Content
NETWORK	Wi-Fi: SSID IP: X.X.X.X ETH: status (ready, link down / active)
SENSORS	Weather: ok/err \| coord: GNSS/none Outdoor T: ok/err \| SHT30: ok/err RS485 wind: ok/err \| GNSS: FIX/NO FIX \| X.X m/s
AUDIO	Volume: XX Codec: 44100 Hz, 16 bit, 2 ch. I2S: BCK GPIO \| WS GPIO \| DO GPIO \| DI GPIO
SD / STORAGE	SD: mounted / not found Storage part: XXXX KB Pins: D0–D3 with GPIO numbers

Row 3

Tile	Content
DISPLAY	LCD: 1024×600 MIPI-DSI Panel: JD9165 \| Touch: GT911 Backlight: GPIOXX
C6 / GNSS	C6: SDIO active UART ext: TX XX RX XX GNSS: TX XX RX XX \| PPS: yes/no
BUSES AND PINS	I2C: SDA X SCL X RGB: WS2812 GPIOXX \| BL GPIOXX Scenario: on/off \| Brightness: XXX/X
UPTIME	Uptime: N d HH:MM:SS Unix: XXXXXXXXXX Part: factory \| XXXX KB

Row 4

Tile	Content
INA226 / BATTERY	Bus V \| Load V I: X.X mA \| P: X.X mW \| status MFR: 0xXXXX DIE: 0xXXXX
SYSTEM	Tasks: N \| Reset: reason \| Heap min: XXXX KB HWM(B): L=XXXX S=XXXX G=XXXX P=XXXX H=XXXX
OTA / PARTITIONS	Running: factory @ 0xXXXXX Next OTA: none (factory) / ota_0 State: N/A / Valid / Invalid
TIME / NTP	Current system time, sync source, NTP status

Screen topbar: SERVICE (not "Service"). The "Reset SD logs" button with a YES / CANCEL confirmation dialog is in the code located on the Charts screen (the "RESET" button in the top panel), not on the Service screen.

Diagnostics

Access: Settings → "Diagnostics" tile. Topbar: DIAGNOSTICS.

The screen consists of 8 tiles (2 columns × 4 rows) with live data and hints:

Tile	Colour
LAST RESET REASON	Red
MEMORY / FREERTOS	Green
POWER / BATTERY	Yellow
NETWORK	Blue
SENSORS / GNSS	Purple
OTA / PARTITIONS	Cyan
ERRORS / REASONS	Orange
WHAT TO CHECK	Orange

Footer hint: "Diagnostics shows the reset cause, live state of the network, sensors and power. For PANIC/WDT keep the UART log: the UI sees the final cause, but not the full backtrace."

About

Access: Settings → "About" tile. A scrollable text report with the following sections:

IDENTIFICATION AND BUILD — ESP32-P4 chip rev, cores, Flash 16 MB, PSRAM, heap summary.
NETWORK AND STORAGE — Wi-Fi online/offline + SSID, Ethernet, SD, factory partition (with address and size), storage partition.
POWER AND STATE — Vbat, detect, raw ADC, percentage, charge status ("charging" / "rest/discharge" / "--"), uptime as N d HH:MM:SS, Unix time, reset cause.
SENSORS AND SERVICES — Weather ok/none, GNSS time, Outdoor T, Pressure, CO2/VOC/NOx, Audio volume, OTA status.
COPYRIGHT HOLDER AND TERMS OF USE — Sergii Stelmakhovych / SRG BlackCore, firmware license version 2.0, proprietary license text.
THIRD-PARTY LICENSES — list and links to license texts: LVGL (MIT), ESP-IDF / BSP / esp_hosted / esp-audio-player / esp-libhelix-mp3 (Apache-2.0).
Full text of the proprietary license (from the embedded LICENSE_PROPRIETARY.txt).

LED Indicators

Access: Settings → "LED Indicators" tile.

Topbar: LED INDICATORS. Intro card: "Bottom status bar" / "Each indicator shows the current state of a subsystem. Colour and lighting mode depend on the state."

The screen describes the bottom status bar of the Main screen — 10 indicators, each showing the state of one subsystem.

Indicator	Subsystem	States (left — better, right — worse)
WIFI	Wi-Fi state	● connected				● off / no link
TIME	Internet, NTP, API	● time synced	● network without time	● API/NTP error		● no network
GNSS	Navigation and FIX	● FIX/PPS	● FIX	● no FIX		● no data
WEATH.	Current weather	● clear	● cloudy	● fog	● rain	● snow ● thunderstorm
FORE.	Forecast and risk	● calm	● cloudy	● snow	● precipitation/POP	● wind ● thunderstorm
CO2	CO₂ level	● < 800 ppm	● 800–999 ppm	● 1000–1399		● ≥ 1400
IAQ	Air quality	● normal	● dry	● ventilate	● bad air	● critical
PRESS.	Pressure trend	● stable	● rising	● rapid rise	● falling	● sharp drop
PLAYER	Player and scenarios	● inactive	● scenario	● radio ● Spotify	● dawn	● error
RISK	Alarms and faults	● no alarms	● API error	● pressure drop	● frost	● fault / CO₂

Automatic Alerts and Thresholds

Alert / indicator	Condition in code
High CO₂ (LED CO2)	Colour zones: `< 800 / 800-999 / 1000-1399 / ≥ 1400` ppm (see LED Indicators). Signal threshold in meteo_data: `AIR_CRITICAL` ≥ 1500 ppm.
"Ventilate now" card	CO₂ ≥ 1400 ppm with hysteresis down to 1350 (see Sensors screen, level 1).
Pressure drop	Δp ≥ −3 hPa over 3 hours (trend "Falling fast", RGB pressure zone).
Frost risk	In the synoptic code: `SYN_FROST_TEMP_C = 2.0 °C` — outdoor temperature is taken into account (RS485 SHT30); affects the RISK LED zone.

MQTT Telemetry (Server)

Access: the Server tile in the Control Center. Swipe right returns to Settings. The mqtt_telemetry component publishes the firmware version (mqtt_telemetry_set_firmware_version) and live sensor readings to the MQTT broker.

Data Storage

Storage	What is stored	Notes
NVS (Flash)	Wi-Fi settings, time zone, SGP41 calibration, audio settings	Survives reboot and power loss
LP-SRAM (RTC)	48-point barograph, chart history, forecast history	Survives `esp_restart()` and WDT reset. Does NOT survive cold power-on
SPIFFS	Backups of charts and forecast history	Restored after cold start
SD card (FAT32)	CSV/JSON sensor log, audio files	Up to 4 simultaneous streams

On cold start (full power loss) LP-SRAM data is lost. The barograph and chart history are restored from SPIFFS if the backup is current.

Firmware Version

The current firmware version is shown on the Service screen in the FIRMWARE tile.

Version format: p4 YY.NN.XXXX

p4 — ESP32-P4 platform
YY — year (22 = 2022)
NN — iteration / build number
XXXX — source-code change counter

The change counter increments with every change to the firmware source code or resources.

Meteo P4 · Firmware p4 22.31.0641 · ESP-IDF 6.0.1 · LVGL v9

Meteo P4

Device Overview

Technical Specifications

Connection Diagram

Connectors and components of the JC-ESP32P4-M3 board

Functional connection diagram

GPIO Assignments

I2C Sensors (internal)

RS485 Sensors (external)

RS485 connector pinout (#11, MX 1.25 4P)

Power and Battery

Battery measurement

Screen Navigation

Transition map (swipes)

Tap transitions

Main Screen

Top bar (header)

Left column — weather and sensors

Centre — clock and ventilation

Right column — forecast and moon

5-day forecast

Pressure and trend

Ventilation card

Moon phase

Sensor Details

Top row — sensor tiles

VENTILATION card

NOISE tile (below the main row)

Barograph (PRESSURE | 12-HOUR BAROGRAPH)

Navigation buttons

GNSS Screen

Top bar — GNSS STATUS

Coordinate tiles

Lower three blocks

NAVIGATION

TIME

LOCATION, SYSTEMS AND TIME

Lower part — Skyview (orbital animation)

System colours (per gnss_skyview_ui code)

HDOP scale (shown on the GNSS screen)

Local Forecast

Card A — CURRENT / ESTIMATE

Card B — HAZARDS

Card C — LOCAL FORECAST

Card D — MODEL

Card E — PRESSURE TREND (12 h)

Hourly Forecast (5 days)

Top row — day selector

Lower panel — details of the selected day

Left block — day summary

Right block — hourly table

Charts

Filter buttons (top panel)

Charts (AIR tab)

Media Player

Left panel — status

Sleep timer (SLEEP TIMER)

WI-FI RADIO mode

SD CARD mode

Control buttons (common to both modes)

Scenarios / Alarm

Screen structure

MEDIA panel

BRIGHTNESS panel

Control Center (Settings)

First-row tiles (5 items)

Second-row tiles (5 items)

Wi-Fi / Internet

Left card — "Available networks"

Right card — "Connection"

"Internet speed" card

Connecting to a network

Service Screen

Row 1

Row 2

Row 3

Row 4

Diagnostics

About

LED Indicators