diff --git a/arduino/platformio.ini b/arduino/platformio.ini
index 4b782ad..6d3c4bf 100644
--- a/arduino/platformio.ini
+++ b/arduino/platformio.ini
@@ -1,5 +1,5 @@
 [env:uno]
 platform = atmelavr
-board = uno
+board = micro
 framework = arduino
 monitor_speed = 115200
diff --git a/arduino/src/main.cpp b/arduino/src/main.cpp
index 98618b4..ab9345c 100644
--- a/arduino/src/main.cpp
+++ b/arduino/src/main.cpp
@@ -17,7 +17,7 @@ static const uint16_t POLL_DELAY_MS = 2;
 
 // Trigger format sent to backend: "GPIO<pin_number>".
 // Arduino Uno default uses D2 here.
-static const uint8_t MONITORED_PINS[] = {3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13};
+static const uint8_t MONITORED_PINS[] = {3, 5, 7, 9};
 static const size_t PIN_COUNT = sizeof(MONITORED_PINS) / sizeof(MONITORED_PINS[0]);
 
 struct PinState {