commit 32ba4133809c5d2cf9ace0ae8f4b116ba11ed673
Author: Fabian Müller <fabian@fablab-altmuehlfranken.de>
Date:   Thu Mar 21 01:38:53 2024 +0100

    Initial commit

diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
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+.pio/
+credentials.h
diff --git a/README.md b/README.md
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index 0000000..c76f549
--- /dev/null
+++ b/README.md
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+# ESP8266 LED Marquee Sign Controller
diff --git a/platformio.ini b/platformio.ini
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index 0000000..03517ed
--- /dev/null
+++ b/platformio.ini
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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env]
+platform = espressif8266
+framework = arduino
+monitor_speed = 115200
+upload_speed = 500000
+
+# Serial1 (sign data) maps to D4 by default
+[env:d1_mini]
+board = d1_mini
+
+[env:nodemcuv2]
+board = nodemcuv2
diff --git a/src/credentials.h.example b/src/credentials.h.example
new file mode 100644
index 0000000..dd11ebf
--- /dev/null
+++ b/src/credentials.h.example
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+#pragma once
+
+namespace credentials {
+    const String ssid = "my SSID";
+    const String psk = "my PSK";
+
+    const String mdnsHostname = "led-marquee-sign";
+}
diff --git a/src/main.cpp b/src/main.cpp
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--- /dev/null
+++ b/src/main.cpp
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+#include <ESP8266WiFiMulti.h>
+#include <ESP8266mDNS.h>
+#include <ESP8266WebServer.h>
+
+#include "credentials.h"
+#include "webserver.h"
+#include "util.h"
+
+static ESP8266WiFiMulti wifiMulti;
+
+void setup() {
+    // serial console, for use via USB (also exposed to TXD0/RXD0 GPIOs)
+    Serial.begin(115200);
+
+    // transmit-only UART port, used for communication with the LED sign
+    // the BAUD rate was deducued from the communication sent to the USB 12V UART adapter by the available Windows
+    // software
+    Serial1.begin(9600);
+
+    // configure WiFi and connect to the network
+    wifiMulti.addAP(credentials::ssid.c_str(), credentials::psk.c_str());
+    Serial.println("Connecting to Wi-Fi network...");
+    while (wifiMulti.run() != WL_CONNECTED) {
+        delay(1000);
+        Serial.print(".");
+    }
+    Serial.println();
+    Serial.print("Connected to ");
+    Serial.print(WiFi.SSID());
+    Serial.print(", IP address: ");
+    Serial.println(WiFi.localIP());
+
+    // might be handy to have the IP written on the sign
+    sendTextToSign(WiFi.localIP().toString());
+
+    // publish this service using mDNS so that it's easy to find it in the LAN
+    if (MDNS.begin(credentials::mdnsHostname)) {
+        Serial.println("mDNS started up successfully");
+    } else {
+        Serial.println("Error: failed to start mDNS");
+    }
+
+    // configure HTTP endpoints
+    configureWebServer();
+
+    // don't forget to start the webserver!
+    webServer.begin();
+}
+
+void loop() {
+    webServer.handleClient();
+}
diff --git a/src/util.h b/src/util.h
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index 0000000..f023365
--- /dev/null
+++ b/src/util.h
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+#pragma once
+
+enum Brightness {
+    Normal,
+    Bright,
+};
+
+void sendTextToSign(String text, Brightness brightness = Bright) {
+    // debugging
+    Serial.print("Sending text \"");
+    Serial.print(text);
+    Serial.println("\"");
+
+    // TODO: find out how the brightness attribute in the LED sign is encoded in the UART signal
+    Serial1.print("f01A\\s");
+    Serial1.print(text);
+    Serial1.print("\r\r\r");
+}
diff --git a/src/webserver.h b/src/webserver.h
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index 0000000..f6d48c3
--- /dev/null
+++ b/src/webserver.h
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+#pragma once
+
+#include "util.h"
+
+static ESP8266WebServer webServer(80);
+
+// use an anonymous namespace for the module's "private" methods
+// this prevents the methods from ending up in the global namespace
+namespace {
+    void handleNotFound() {
+        webServer.send(404, "text/plain", "urm... nope");
+    }
+
+    void handleIndex() {
+        String htmlText = R"(
+<!DOCTYPE html>
+<html>
+    <head>
+        <title>LED Marquee Sign Controller</title>
+    </head>
+
+    <body>
+        <h1>LED Marquee Sign Controller</h1>
+        <form action="/" method="post">
+            <fieldset>
+                <div>
+                    <label for="text">Text to send:</label>
+                    <input type="text" name="text">
+                </div>
+
+                <div>
+                    <label for="bright">Bright mode</label>
+                    <input type="checkbox" name="bright">
+                </div>
+
+                <div>
+                    <button>Send</button>
+                </div>
+            </fieldset>
+        </form>
+    </body>
+</html>
+        )";
+        webServer.send(200, "text/html", htmlText);
+    }
+
+    void handleFormSend() {
+        sendTextToSign("HELLO FORM");
+
+        // redirect back to root page
+        webServer.sendHeader("Location", "/");
+        webServer.send(303);
+    }
+
+    // RESTful API endpoint -- returns a proper status code rather than a redirect
+    void handleApiSend() {
+        sendTextToSign("HELLO API");
+        webServer.send(200, "text/plain", "ok");
+    }
+}
+
+void configureWebServer() {
+    webServer.onNotFound(handleNotFound);
+
+    webServer.on("/", HTTPMethod::HTTP_GET, handleIndex);
+    webServer.on("/", HTTPMethod::HTTP_POST, handleFormSend);
+    webServer.on("/send", HTTPMethod::HTTP_POST, handleApiSend);
+}