ALLNET 4duino IoT WLAN display case - ESP32 module with 4 lines display Here is the download link to print it yourself. https://www.thingiverse.com/thing:3148876

Highlights: 4 Digit Display PoE-power supply based on IEEE802.3af Integrated web interface for configuration and counter settings 2-wire, potential-free contact for keys, light barriers, motion detecors, etc. XML access for remote text input/queries The ALLNET PoE-Counter displays the given impulse of potential free signal generators. Switching relays, door contacts, floor mats, light barriers or motion detectors can be used as signal generators. Furthermore, different values or letters with up to four characters can be displayed.   The counter offers a 10/100 network port, with PoE functionality. Application examples: People counting function for clubs "how many persons move in or out " production count "How many pieces of product X have been manufactured" Parking garage Waiting rooms with optional external applicationtechnical data:Network: 10/100BaseTXNetwork connection:RJ45 Contact connection: 1x potentialfree contact input Supported standards: IEEE 802.3IEEE 802.3uProtocols:HTTP / JSON / XML Management/control: via Webbrowser, XML, JSONOS:all network-based OS Power supply: IEEE802.3af PoEHousing: metal housing with VESA 75 optionEnvironment: Temperature operation: 0 ~ 40 °CHumidity operation: 10% ~ 85% (non condensing)Temperature Storage: -20 ~ 60 °C Humidity storage: 5% ~ 90% (non condensing)Dimensions: 141 x 370 x 43 mm (HxWxD) Weight: 2 kg (Adapter only)

Das Display benötigt zum Betrieb lediglich einen USB-Anschluss zur Stromversorgung und Zugang zu einem W-LAN Hotspot, über den sich das Display mit dem Internet verbinden kann. Die Verbindung des Displays an einen HotSpots wird über ein Smartphone hergestellt, mit dem das ALLNET IoT-Display ausgewählt wird.  Der hierzu benötigte Software Sourcecode steht kostenlos unter diesem Link zum Download bereit.