Implemented LED brightness setting, started I2C slave code, made reset pin consistent with wiring for DOIT DevKit.

data/src/css/style.scss

@@ -4,6 +4,8 @@
 @import "../node_modules/bootstrap/scss/variables";
 @import "../node_modules/bootstrap/scss/variables-dark";
 
+$form-range-track-bg: #fff;
+
 @import "../node_modules/bootstrap/scss/mixins";
 @import "../node_modules/bootstrap/scss/maps";
 @import "../node_modules/bootstrap/scss/utilities";

data/src/index.html

@@ -133,6 +133,12 @@
                 </div>
               </div>
             </div>
+            <div class="row">
+              <label class="col-sm-6 col-form-label" for="ledBrightness">LED brightness</label>
+              <div class="col-sm-6">
+                  <input type="range" class="form-range" id="ledBrightness" name="ledBrightness" value="128" min="0" max="255">
+              </div>
+            </div>
             <div class="row">
               <div class=" col-sm-6">
                 <div class="form-check form-switch">

data/src/js/script.ts

@@ -51,6 +51,7 @@ fetch('/api/settings', {
         }
 
         document.getElementById('timePerScreen').value = jsonData.timerSeconds / 60;
+        document.getElementById('ledBrightness').value = jsonData.ledBrightness;
 
         var source = document.getElementById("screens-template").innerHTML;
         var template = Handlebars.compile(source);

src/lib/functions.cpp

@@ -7,7 +7,7 @@ std::map<int, std::string> screenNameMap;
 
 #ifndef NO_MCP
 Adafruit_MCP23X17 mcp;
-const int MCP_INT_PIN = 8; 
+const int MCP_INT_PIN = 8;
 
 #endif
 bool timerRunning = true;
@@ -51,17 +51,13 @@ void setupComponents()
     else
     {
         Serial.println("MCP23017 ok");
-        pinMode(MCP_INT_PIN, INPUT); 
+        pinMode(MCP_INT_PIN, INPUT);
         mcp.setupInterrupts(true, false, LOW);
     }
 #endif
 
 #ifdef WITH_RGB_LED
     pixels.begin();
-    pixels.setPixelColor(0, pixels.Color(255, 0, 0));
-    pixels.setPixelColor(1, pixels.Color(0, 255, 0));
-    pixels.setPixelColor(2, pixels.Color(0, 0, 255));
-    pixels.setPixelColor(3, pixels.Color(255, 255, 255));
     pixels.show();
 #endif
 
@@ -114,13 +110,21 @@ void setupPreferences()
     bgColor = preferences.getUInt("bgColor", DEFAULT_BG_COLOR);
     preferences.getBool("ledFlashOnUpd", false);
 
-
     screenNameMap = {{SCREEN_BLOCK_HEIGHT, "Block Height"},
                      {SCREEN_MSCW_TIME, "Sats per dollar"},
                      {SCREEN_BTC_TICKER, "Ticker"},
                      {SCREEN_TIME, "Time"},
                      {SCREEN_HALVING_COUNTDOWN, "Halving countdown"}};
 
+#ifdef WITH_RGB_LED
+    pixels.setBrightness(preferences.getUInt("ledBrightness", 128));
+    pixels.setPixelColor(0, pixels.Color(255, 0, 0));
+    pixels.setPixelColor(1, pixels.Color(0, 255, 0));
+    pixels.setPixelColor(2, pixels.Color(0, 0, 255));
+    pixels.setPixelColor(3, pixels.Color(255, 255, 255));
+    pixels.show();
+#endif
+
     for (int i = 0; i < screenNameMap.size(); i++)
     {
         String key = "screen" + String(i) + "Visible";
@@ -154,7 +158,8 @@ void handleScreenTasks(uint screen)
     switch (currentScreen)
     {
     case SCREEN_BLOCK_HEIGHT:
-        if (blockNotifyTaskHandle) {
+        if (blockNotifyTaskHandle)
+        {
             vTaskResume(blockNotifyTaskHandle);
         }
         break;
@@ -171,7 +176,8 @@ void handleScreenTasks(uint screen)
             vTaskResume(getPriceTaskHandle);
         break;
     case SCREEN_TIME:
-        if (minuteTaskHandle) {
+        if (minuteTaskHandle)
+        {
             TimeScreen::onActivate();
             vTaskResume(minuteTaskHandle);
         }
@@ -212,8 +218,9 @@ void timebasedChangeTask(void *parameter)
     }
 }
 
-int modulo(int x,int N) {
-    return (x % N + N) %N;
+int modulo(int x, int N)
+{
+    return (x % N + N) % N;
 }
 
 void nextScreen()
@@ -236,7 +243,7 @@ void previousScreen()
 
     while (!preferences.getBool(key.c_str(), true))
     {
-        newCurrentScreen = modulo(newCurrentScreen - 1,  screenCount);
+        newCurrentScreen = modulo(newCurrentScreen - 1, screenCount);
         key = "screen" + String(newCurrentScreen) + "Visible";
     }
     setCurrentScreen(newCurrentScreen);
@@ -252,4 +259,32 @@ void setLights(int r, int g, int b)
 
     pixels.show();
 #endif
+}
+
+void setupI2C()
+{
+    bool slaveMode = preferences.getBool("I2CSlaveMode", false);
+
+    if (slaveMode)
+    {
+        Serial.println("I2C Slave Mode enabled");
+        Wire.onReceive(onI2CReceive);
+        Wire.begin((uint8_t)I2C_DEV_ADDR);
+    }
+}
+
+void onI2CReceive(int len)
+{
+    Serial.printf("onReceive[%d]: ", len);
+    while (Wire.available())
+    {
+        Serial.write(Wire.read());
+    }
+    Serial.println();
+}
+
+void onI2CRequest()
+{
+    Wire.print("I2C Packets.");
+    Serial.println("onRequest");
 }

src/lib/functions.hpp

@@ -16,6 +16,9 @@ void setupWifi();
 void synchronizeTime();
 void setupPreferences();
 void setLights(int r, int g, int b);
+void setupI2C();
+void onI2CReceive(int len);
+void onI2CRequest();
 
 uint getCurrentScreen();
 void setCurrentScreen(uint screen);

src/lib/webserver.cpp

@@ -153,7 +153,7 @@ void onApiSettingsGet(AsyncWebServerRequest *request)
     root["epdColors"] = 3;
 #endif
     root["ledFlashOnUpdate"] = preferences.getBool("ledFlashOnUpd", false);
-
+    root["ledBrightness"] = preferences.getUInt("ledBrightness", 128);
     JsonArray screens = root.createNestedArray("screens");
 
     for (int i = 0; i < screenNameMap.size(); i++)
@@ -208,6 +208,16 @@ void onApiSettingsPost(AsyncWebServerRequest *request)
         settingsChanged = true;
     }
 
+    if (request->hasParam("ledBrightness", true))
+    {
+        AsyncWebParameter *ledBrightness = request->getParam("ledBrightness", true);
+
+        preferences.putUInt("ledBrightness", ledBrightness->value().toInt());
+        Serial.print("Setting brightness to ");
+        Serial.println(ledBrightness->value().c_str());
+        settingsChanged = true;
+    }
+
     for (int i = 0; i < screenNameMap.size(); i++)
     {
         String key = "screen[" + String(i) + "]";

src/main.cpp

@@ -3,7 +3,7 @@
 #include <shared.hpp>
 #include <WiFi.h>
 #include <WiFiClientSecure.h>
-//#include <ESP32Time.h>
+// #include <ESP32Time.h>
 #include <WiFiManager.h>
 
 #ifdef CONFIG_BT_ENABLED
@@ -54,30 +54,37 @@ void setup()
 #endif
   setupWifi();
 
-  synchronizeTime();
-  setupWebserver();
+  bool slaveMode = preferences.getBool("I2CSlaveMode", false);
 
-  TimeScreen::init();
-  BlockHeightScreen::init();
-  TickerScreen::init();
-  SatsPerDollarScreen::init();
+  if (!slaveMode)
+  {
+    synchronizeTime();
+    setupWebserver();
+
+    TimeScreen::init();
+    BlockHeightScreen::init();
+    TickerScreen::init();
+    SatsPerDollarScreen::init();
 
 #ifdef WITH_BUTTONS
-  setupButtonTask();
+    setupButtonTask();
 #endif
 
 #ifdef WITH_RGB_LED
-  setLights(0,0,0);
-  setupLedHandlerTask();
+    setLights(0, 0, 0);
+    setupLedHandlerTask();
 #endif
 
-  registerNewMinuteCallback(TimeScreen::onNewMinute);
-  registerNewBlockCallback(BlockHeightScreen::onNewBlock);
-  registerNewBlockCallback(HalvingCountdownScreen::onNewBlock);
-  registerNewPriceCallback(TickerScreen::onPriceUpdate);
-  registerNewPriceCallback(SatsPerDollarScreen::onPriceUpdate);
+    registerNewMinuteCallback(TimeScreen::onNewMinute);
+    registerNewBlockCallback(BlockHeightScreen::onNewBlock);
+    registerNewBlockCallback(HalvingCountdownScreen::onNewBlock);
+    registerNewPriceCallback(TickerScreen::onPriceUpdate);
+    registerNewPriceCallback(SatsPerDollarScreen::onPriceUpdate);
 
-  setupDisplays();
+    setupDisplays();
+  } else {
+    setupI2C();
+  }
 }
 
 void loop()

src/tasks/epd.cpp

@@ -41,7 +41,7 @@ const int EPD_BUSY[7] = {36, 39, 34, 35, 32, 33, 25};
 const int EPD_RESET_MPD[7] = {8, 9, 10, 11, 12, 13, 14};
 
 const int EPD_DC = 22;
-const int RST_PIN = 12;
+const int RST_PIN = 2;
 #endif
 
 #ifdef IS_BW