Electronic Label

This project provides an electronic label eg. for conference rooms to show next meeting details.

Communication structure is based on ESP32 connected to Wifi containing the configured MQTT-broker. On this MQTT-broker temperature and humidity measured by DHT22 sensor is stored. Furthermore the broker is used to control the layout and content of the display.

Usage

Build and deploy

• Import the project in VS-Code (with platformio plugin).
• copy myconfig.ini_example to myconfig.ini and change to your needs
• run upload task and watch serial output (this is where all debug messages are shown)

configuration

• currently most configuration is still hardcoded in main.cpp :(
• install mqtt-explorer, provide mqtt-broker eg. mosquitto
• check for a wifi called esp32ap and connect to it by using default password (12345678)
• configure esp32 to login to your WIFI containg a mqtt-broker by webinterface (default ip: 172.217.28.1)
• configure esp32 at topic "sensors/[esp32-mac]/config"
• check esp32 has published sensor data in mqtt topic "pasx/sensordata/[configured-alias]/data"
• provide a layout in mqtt-broker eg. to display sensor data at topic "layouts/[layout-name]"

configuration definition

at topic: "sensors/[esp32-mac]/config"

{
  "publishTemperature": true,
  "publishHumidity": true,
  "publishRssi": true,
  "dataTopic": "pasx/sensordata/sensor42/data",
  "layoutName": "standard",
  "alias": "sensor42"
}

layout definition

at topic: "layouts/[layout-name]" eg "layouts/standard"

[
   {
      "type":"rightText",
      "y":2,
      "size":18,
      "color":"black",
      "text":"test$id$?"
   },
   {
      "type":"leftText",
      "y":48,
      "size":9,
      "color":"black",
      "text":"Prod: $prod$"
   },
   {
      "type":"hline",
      "y":40,
      "w":4,
      "color":"black"
   }
]

Used Parts:

ESP-32S ESP-WROOM-32 https://de.aliexpress.com/item/32864722159.html?spm=a2g0s.9042311.0.0.78bf4c4d8wRSPD https://www.reichelt.de/de/de/nodemcu-esp32-wifi-und-bluetooth-modul-debo-jt-esp32-p219897.html?r=1

GDEH0213B73 2,13 zoll 250x122 e-papier display with demo kit https://de.aliexpress.com/item/4000048359196.html?spm=a2g0s.9042311.0.0.24294c4d661JFs

DHT22 digitale temperatur and humidity sensor AM2302 Modul + PCB with cables https://de.aliexpress.com/item/33037061522.html?spm=a2g0s.9042311.0.0.24294c4d661JFs

Connect Hardware

Connect Display:

(see epaper.h for board dependend reconfiguration)

BUSY                ->  PIN_BUSY -> eg. GPIO4
RES                 ->  PIN_RST  -> eg. GPIO16 (RX2)
D/C                 ->  PIN_DC   -> eg. GPIO17 (TX2)
CS                  ->  PIN_CS   -> eg. GPIO5 (VSPI-CS0)
SCK                 ->  PIN_CLK  -> eg. GPIO18 (VSPI-CLK)
SDI(Serial Data In) ->  PIN_DIN  -> eg. GPIO23 (VSPI-MOSI)
GND
3.3V 

Connect DHT22 Sensor

defined in main.cpp

3.3V
DHT_PIN          21
GND