diff --git a/README.md b/README.md
index a8d5fa6..71eeaad 100644
--- a/README.md
+++ b/README.md
@@ -11,4 +11,23 @@ STL's coming soon, case still being developed.
 ## Wiring
 
 ![Handwritten diagram](/assets/circuit/handwritten/circuit%20diagram.jpeg)
-![Handwritten pins](/assets/circuit/handwritten/gpio%20usage.jpeg)
+
+## Pin usage
+
+| GPIO | Usage          |
+| ---- | -------------- |
+| GND  | GND to others  |
+| 3,5V | VIN on RS485   |
+| 5V   | VIN on W5500   |
+| 0    | Onboard Button |
+| 5    | Ext. Button    |
+| 7    | Ext. LED       |
+| 15   | Onboard LED    |
+| 17   | U1TXD          |
+| 18   | U1RXD          |
+| 21   | U0TXD          |
+| 33   | U0RXD          |
+| 34   | SPI CS         |
+| 35   | SPI MOS        |
+| 36   | SPI SCK        |
+| 37   | SPI MISO       |
diff --git a/assets/circuit/handwritten/gpio usage.jpeg b/assets/circuit/handwritten/gpio usage.jpeg
deleted file mode 100644
index 075ea1c..0000000
Binary files a/assets/circuit/handwritten/gpio usage.jpeg and /dev/null differ