diff --git a/boards/esp32-32e-4/board-config.sh b/boards/esp32-32e-4/board-config.sh
new file mode 100644
index 0000000..ed7d51e
--- /dev/null
+++ b/boards/esp32-32e-4/board-config.sh
@@ -0,0 +1,4 @@
+FQBN="esp32:esp32:esp32:FlashSize=4M,PartitionScheme=default"
+PORT="/dev/ttyUSB0"
+LIBS="--libraries ./vendor/esp32-32e-4/TFT_eSPI"
+OPTS="-DDEBUG_MODE -DBOARD_HAS_PSRAM"
diff --git a/boards/esp32-32e/board-config.sh b/boards/esp32-32e/board-config.sh
new file mode 100644
index 0000000..aa3d5eb
--- /dev/null
+++ b/boards/esp32-32e/board-config.sh
@@ -0,0 +1,4 @@
+FQBN="esp32:esp32:esp32:FlashSize=4M,PartitionScheme=default"
+PORT="/dev/ttyUSB0"
+LIBS="--libraries ./vendor/esp32-32e/TFT_eSPI"
+OPTS="-DDEBUG_MODE -DBOARD_HAS_PSRAM"
diff --git a/boards/esp32-s3-lcd-43/board-config.sh b/boards/esp32-s3-lcd-43/board-config.sh
new file mode 100644
index 0000000..77e0f15
--- /dev/null
+++ b/boards/esp32-s3-lcd-43/board-config.sh
@@ -0,0 +1,4 @@
+FQBN="esp32:esp32:waveshare_esp32_s3_touch_lcd_43:PSRAM=enabled,FlashSize=16M,USBMode=hwcdc,PartitionScheme=app3M_fat9M_16MB"
+PORT="/dev/ttyACM0"
+LIBS="--libraries ./vendor/esp32-s3-lcd-43/LovyanGFX"
+OPTS="-DDEBUG_MODE -DBOARD_HAS_PSRAM -DLGFX_USE_V1"
diff --git a/libraries/KlubhausCore/src/DoorbellLogic.cpp b/libraries/KlubhausCore/src/DoorbellLogic.cpp
index 45a1c76..d9a7d0c 100644
--- a/libraries/KlubhausCore/src/DoorbellLogic.cpp
+++ b/libraries/KlubhausCore/src/DoorbellLogic.cpp
@@ -133,7 +133,8 @@ void DoorbellLogic::update() {
     default:
         // Inactivity timeout: turn off screen after no activity
         if(_state.screen != ScreenID::OFF && now - _lastActivityMs > INACTIVITY_TIMEOUT_MS) {
-            Serial.println("[STATE] Inactivity timeout → OFF");
+            Serial.printf("[%lu] [STATE] Inactivity timeout (%lu ms) → OFF\n",
+                millis(), now - _lastActivityMs);
             _state.screen = ScreenID::OFF;
             _display->setBacklight(false);
             _state.backlightOn = false;
@@ -229,10 +230,12 @@ void DoorbellLogic::onAdmin(const String& cmd) {
         delay(500);
         ESP.restart();
     } else if(cmd == "dashboard") {
+        Serial.printf("[%lu] [ADMIN] dashboard\n", millis());
         _state.screen = ScreenID::DASHBOARD;
         _display->setBacklight(true);
         _state.backlightOn = true;
     } else if(cmd == "off") {
+        Serial.printf("[%lu] [ADMIN] off\n", millis());
         _state.screen = ScreenID::OFF;
         _display->setBacklight(false);
         _state.backlightOn = false;
@@ -312,7 +315,7 @@ int DoorbellLogic::handleTouch(const TouchEvent& evt) {
     _lastActivityMs = millis();
 
     if(_state.screen == ScreenID::OFF) {
-        Serial.println("[TOUCH] OFF → DASHBOARD");
+        Serial.printf("[%lu] [TOUCH] OFF → DASHBOARD\n", millis());
         setScreen(ScreenID::DASHBOARD);
         return -1;
     }
diff --git a/mise.toml b/mise.toml
index cf88626..95c0ea9 100644
--- a/mise.toml
+++ b/mise.toml
@@ -6,70 +6,41 @@
 [tools]
 hk = "latest"
 pkl = "latest"
+# zellij = "latest"  # Install manually if needed (brew install zellij)
 
 # Usage:
 #   BOARD=esp32-32e-4 mise run compile   # compile
 #   BOARD=esp32-32e-4 mise run upload     # upload
 #   BOARD=esp32-32e-4 mise run monitor    # monitor
-#   BOARD=esp32-32e-4 mise run monitor-screen  # screen monitor with auto-reconnect
+#   BOARD=esp32-32e-4 mise run monitor-screen  # shows tio command to run manually
 #
-# Valid BOARD: esp32-32e, esp32-32e-4, esp32-s3-43
+# Valid BOARD: esp32-32e, esp32-32e-4, esp32-s3-lcd-43
+# Board config lives in: boards/{BOARD}/board-config.sh
 
 [tasks.compile]
 description = "Compile (uses BOARD env var)"
 run = """
-case "$BOARD" in
-  esp32-32e)
-    FQBN="esp32:esp32:esp32:FlashSize=4M,PartitionScheme=default"
-    LIBS="--libraries ./vendor/esp32-32e/TFT_eSPI"
-    OPTS="-DDEBUG_MODE -DBOARD_HAS_PSRAM"
-    ;;
-  esp32-32e-4)
-    FQBN="esp32:esp32:esp32:FlashSize=4M,PartitionScheme=default"
-    LIBS="--libraries ./vendor/esp32-32e-4/TFT_eSPI"
-    OPTS="-DDEBUG_MODE -DBOARD_HAS_PSRAM"
-    ;;
-  esp32-s3-43)
-    FQBN="esp32:esp32:waveshare_esp32_s3_touch_lcd_43:PSRAM=enabled,FlashSize=16M,USBMode=hwcdc,PartitionScheme=app3M_fat9M_16MB"
-    LIBS="--libraries ./vendor/esp32-s3-lcd-43/LovyanGFX"
-    OPTS="-DDEBUG_MODE -DBOARD_HAS_PSRAM -DLGFX_USE_V1"
-    ;;
-  *) echo "Unknown BOARD: $BOARD" && exit 1 ;;
-esac
+source ./boards/$BOARD/board-config.sh
 arduino-cli compile --fqbn "$FQBN" --libraries ./libraries $LIBS --build-property "compiler.cpp.extra_flags=$OPTS" --warnings default ./boards/$BOARD
 """
 
 [tasks.upload]
 description = "Upload (uses BOARD env var)"
 run = """
-# Kill any screen session holding the port
-screen -X -S doorbell quit 2>/dev/null || true
-sleep 1
+source ./boards/$BOARD/board-config.sh
 
-case "$BOARD" in
-  esp32-32e) PORT="${PORT:-/dev/ttyUSB0}" ;;
-  esp32-32e-4) PORT="${PORT:-/dev/ttyUSB0}" ;;
-  esp32-s3-43) PORT="${PORT:-/dev/ttyACM0}" ;;
-  *) echo "Unknown BOARD: $BOARD" && exit 1 ;;
-esac
-FQBN=""
-case "$BOARD" in
-  esp32-32e) FQBN="esp32:esp32:esp32:FlashSize=4M,PartitionScheme=default" ;;
-  esp32-32e-4) FQBN="esp32:esp32:esp32:FlashSize=4M,PartitionScheme=default" ;;
-  esp32-s3-43) FQBN="esp32:esp32:waveshare_esp32_s3_touch_lcd_43:PSRAM=enabled,FlashSize=16M,USBMode=hwcdc,PartitionScheme=app3M_fat9M_16MB" ;;
-esac
-LIBS=""
-case "$BOARD" in
-  esp32-32e) LIBS="--libraries ./vendor/esp32-32e/TFT_eSPI" ;;
-  esp32-32e-4) LIBS="--libraries ./vendor/esp32-32e-4/TFT_eSPI" ;;
-  esp32-s3-43) LIBS="--libraries ./vendor/esp32-s3-lcd-43/LovyanGFX" ;;
-esac
-OPTS=""
-case "$BOARD" in
-  esp32-32e) OPTS="-DDEBUG_MODE -DBOARD_HAS_PSRAM" ;;
-  esp32-32e-4) OPTS="-DDEBUG_MODE -DBOARD_HAS_PSRAM" ;;
-  esp32-s3-43) OPTS="-DDEBUG_MODE -DBOARD_HAS_PSRAM -DLGFX_USE_V1" ;;
-esac
+LOCKFILE="/tmp/doorbell-$BOARD.lock"
+if [ -f "$LOCKFILE" ]; then
+    echo "Error: Another instance is running (lockfile exists: $LOCKFILE)"
+    echo "Remove with: rm $LOCKFILE"
+    exit 1
+fi
+trap 'rm -f "$LOCKFILE"' EXIT
+touch "$LOCKFILE"
+
+echo "Acquired lock: $LOCKFILE"
+
+PORT="${PORT:-$PORT}"
 arduino-cli compile --fqbn "$FQBN" --libraries ./libraries $LIBS --build-property "compiler.cpp.extra_flags=$OPTS" --warnings default ./boards/$BOARD && \
 arduino-cli upload --fqbn "$FQBN" --port "$PORT" ./boards/$BOARD
 """
@@ -77,42 +48,37 @@ arduino-cli upload --fqbn "$FQBN" --port "$PORT" ./boards/$BOARD
 [tasks.monitor]
 description = "Monitor (uses BOARD env var)"
 run = """
-case "$BOARD" in
-  esp32-32e) PORT="${PORT:-/dev/ttyUSB0}" ;;
-  esp32-32e-4) PORT="${PORT:-/dev/ttyUSB0}" ;;
-  esp32-s3-43) PORT="${PORT:-/dev/ttyACM0}" ;;
-  *) echo "Unknown BOARD: $BOARD" && exit 1 ;;
-esac
+source ./boards/$BOARD/board-config.sh
+PORT="${PORT:-$PORT}"
 TARGET="$(readlink -f "$PORT" 2>/dev/null || echo "$PORT")"
 arduino-cli monitor -p "$TARGET" --config baudrate=115200
 """
 
-[tasks.monitor-screen]
-description = "Screen monitor with auto-reconnect (uses BOARD env var)"
+[tasks.monitor-tio]
+description = "Show tio command to run in separate terminal"
 run = """
-case "$BOARD" in
-  esp32-32e) PORT="${PORT:-/dev/ttyUSB0}" ;;
-  esp32-32e-4) PORT="${PORT:-/dev/ttyUSB0}" ;;
-  esp32-s3-43) PORT="${PORT:-/dev/ttyACM0}" ;;
-  *) echo "Unknown BOARD: $BOARD" && exit 1 ;;
-esac
+source ./boards/$BOARD/board-config.sh
+
+LOCKFILE="/tmp/doorbell-$BOARD.lock"
+if [ -f "$LOCKFILE" ]; then
+    echo "Error: Another instance is running (lockfile exists: $LOCKFILE)"
+    echo "Remove with: rm $LOCKFILE"
+    exit 1
+fi
+trap 'rm -f "$LOCKFILE"' EXIT
+touch "$LOCKFILE"
+
+echo "Acquired lock: $LOCKFILE (Ctrl+C to release)"
+
+PORT="${PORT:-$PORT}"
 TARGET="$(readlink -f "$PORT" 2>/dev/null || echo "$PORT")"
-screen -dmS doorbell bash -c "
-while true; do
-  echo \"Connecting to $TARGET...\"
-  arduino-cli monitor -p \"$TARGET\" --config baudrate=115200
-  echo \"Disconnected, retrying in 3s...\"
-  sleep 3
-done
-"
-echo "Screen session 'doorbell' started. Attach with: screen -r doorbell"
-echo "Detach: Ctrl+A D"
+tio --map INLCRNL "$TARGET" -e
 """
 
 [tasks.monitor-screen-kill]
-description = "Kill screen-based monitor"
+description = "Kill tio (Ctrl+C in the terminal)"
 run = """
-screen -X -S doorbell quit 2>/dev/null && echo "Killed screen session 'doorbell'" || echo "No session found"
+echo "Press Ctrl+C in the tio terminal to exit"
 """
 
 [tasks.install-libs-shared]
@@ -197,7 +163,12 @@ echo "[OK] LovyanGFX vendored"
 
 [tasks.install-libs]
 description = "Install all libraries (shared + vendored)"
-depends = ["install-libs-shared", "install-libs-32e", "install-libs-32e-4", "install-libs-s3-43"]
+depends = [
+  "install-libs-shared",
+  "install-libs-32e",
+  "install-libs-32e-4",
+  "install-libs-s3-43",
+]
 
 # Convenience
 
@@ -211,6 +182,23 @@ rm -rf boards/esp32-s3-lcd-43/build
 echo "[OK] Build artifacts cleaned"
 """
 
+[tasks.arduino-clean]
+description = "Clean Arduino CLI cache (staging + packages)"
+run = """
+echo "Checking ~/.arduino15..."
+du -sh ~/.arduino15/staging 2>/dev/null || echo "No staging folder"
+du -sh ~/.arduino15/packages 2>/dev/null || echo "No packages folder"
+read -p "Delete staging + packages folders? [y/N] " -n 1 -r
+echo
+if [[ $REPLY =~ ^[Yy]$ ]]; then
+  rm -rf ~/.arduino15/staging
+  rm -rf ~/.arduino15/packages
+  echo "[OK] Arduino staging + packages cleared"
+else
+  echo "Aborted"
+fi
+"""
+
 [tasks.format]
 run = """
 clang-format -i --style=file \