diff --git a/arduino/README.md b/arduino/README.md
index b28f207..ebc0284 100644
--- a/arduino/README.md
+++ b/arduino/README.md
@@ -42,6 +42,12 @@ A game controller using a Seeed Studio XIAO nRF52840 Sense board that emulates a
 - **Character Mapping:** Each button event sends a unique character.
 - **Serial Debugging:** Outputs button events and Bluetooth connection status to the serial monitor.
 
+## Schema
+
+Connect each button to its corresponding pin. For reliable input readings add hardware debouncing: use a pull-up resistor 10 kΩ and an RC filter with a 100 nF capacitor across the switch — an RC time constant around 1 ms works well.
+
+![Schema](Schema.png)
+
 ## Button Mappings
 
 | Button | Single Click | Double Click | Long Press |
diff --git a/arduino/Schema.png b/arduino/Schema.png
new file mode 100644
index 0000000..373c398
Binary files /dev/null and b/arduino/Schema.png differ