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BOARD: ESP32-4848S040

https://github.com/CelliesProjects/co2-display-esp32

Project status

Running. Display, touch and CO2 working.

I2C GPIOs

GPIO
SDA 19
SCL 45

Touchpanel is a gt911 I2C device

GT911 ID
ID 0x5D

SPI GPIOs

GPIO
SCL 48
MOSI 47
MISO 41

The sdcard is SPI.

GPIO
CS 42

The display is connected through SPI -no MISO GPIO- and a lot of GPIOs for the actual pixel data.

st7701s GPIO
BACKLIGHT 38
CS 39
SCL 48
MOSI 47
DE 18
VSYNC 17
HSYNC 16
PCLK 21
R0 11
R1 12
R2 13
R3 14
R4 0
G0 8
G1 20
G2 3
G3 46
G4 9
G5 10
B0 4
B1 5
B2 6
B3 7
B4 15

|

The GPIO that control the relays are on the backside of the panel (with the relays removed)

RELAY GPIO
1 40
2 2
3 1

Exposed on the backside are GPIOs marked TXD and RXD.

MARK GPIO
TXD 43
RXD 44

A NS4168 dac is present on the board, but is not connected because of three zero ohm bridges missing on the board.
These bridges connect the LRCLK, BCLK and SDATA to the GPIO
But there is a GPIO conflict here: GPIO4 is used by the tft display as B0 -pixeldata- and also as SDATA -sample data- by the NS4168
I dont know if there is a way to share the GPIOs between the tft and dac

NS4168 GPIO
CTRL NC?
LRCLK 36
BCLK 23
SDATA 4

More info:

https://docs.espressif.com/projects/esp-idf/en/v4.2/esp32/api-reference/protocols/esp_websocket_client.html

https://github.com/espressif/esp-idf/blob/v4.2/examples/protocols/websocket/main/websocket_example.c

https://www.visualcrossing.com/weather/weather-data-services/

https://github.com/visualcrossing/WeatherApi/blob/master/Arduino_samples_esp32/src/sketch.ino

https://github.com/esp-arduino-libs/ESP32_Display_Panel/blob/master/docs/Board_Instructions.md#shenzhen-jingcai-intelligent

https://homeding.github.io/boards/esp32s3/panel-4848S040.htm

arendst/Tasmota#20527

https://michiel.vanderwulp.be/domotica/Modules/SmartDisplay-ESP32-S3-4.0inch/software.html

moononournation/Arduino_GFX#465 <-------WORKING!

https://lastminuteengineers.com/sht31-temperature-humidity-sensor-arduino-tutorial/

https://thingpulse.com/usb-settings-for-logging-with-the-esp32-s3-in-platformio/

https://docs.espressif.com/projects/arduino-esp32/en/latest/troubleshooting.html

https://www.makerfabs.com/esp32-s3-parallel-tft-with-touch-4-inch.html

Example using Lovyan GFX

https://github.com/Makerfabs/ESP32-S3-Parallel-TFT-with-Touch-4inch/blob/main/example/lovyanGFX_demo

About the capacitors on the sensor board

https://picaxeforum.co.uk/threads/5v-voltage-regulator-capacitor-values.30154/

these are the headers for websocket messages

a good message has the header on one line followed bij '\n'

example: G:\n

  • A: new saved average (C: H: T: ) to add to the history
  • C: current co2 level
  • G: history used by both for client (request) and server
  • H: current humidity
  • P: ping used to keep the server informed that the client has not yet buggered off
  • T: current temperature

timeout is 4 seconds no messages received before client reconnects