diff --git a/src/board/arduino/mega2560/README.md b/src/board/arduino/mega2560/README.md
new file mode 100644
index 0000000..c760ec7
--- /dev/null
+++ b/src/board/arduino/mega2560/README.md
@@ -0,0 +1,3 @@
+# Arduino Mega 2560
+
+![Arduino Mega 2560 Pinout](https://arduino.pinout.guide/arduino_mega_pinout.png)
diff --git a/src/board/arduino/mega2560/main.c b/src/board/arduino/mega2560/main.c
index dbcd5c8..fa6f7c4 100644
--- a/src/board/arduino/mega2560/main.c
+++ b/src/board/arduino/mega2560/main.c
@@ -1,14 +1,19 @@
 #include <stdio.h>
 
+#include <arch/gpio.h>
 #include <arch/uart.h>
 
 void init(void) {
     uart_stdio_init(0, 9600);
 }
 
+struct Gpio LED = GPIO(B, 7);
+
 int main(void) {
     init();
 
+    gpio_set_dir(&LED, true);
+    gpio_set(&LED, false);
     printf("Hello from System76 EC for the Arduino Mega 2560!\n");
     for (;;) {
         int c = getchar();
diff --git a/src/board/arduino/micro/README.md b/src/board/arduino/micro/README.md
new file mode 100644
index 0000000..8d5af1e
--- /dev/null
+++ b/src/board/arduino/micro/README.md
@@ -0,0 +1,3 @@
+# Arduino Micro
+
+![Arduino Micro Pinout](https://arduino.pinout.guide/arduino_micro_pinout_and_ISP_pins.png)
diff --git a/src/board/arduino/micro/main.c b/src/board/arduino/micro/main.c
index c1a5255..8b47ffa 100644
--- a/src/board/arduino/micro/main.c
+++ b/src/board/arduino/micro/main.c
@@ -1,14 +1,19 @@
 #include <stdio.h>
 
+#include <arch/gpio.h>
 #include <arch/uart.h>
 
 void init(void) {
     uart_stdio_init(0, 9600);
 }
 
+struct Gpio LED = GPIO(C, 7);
+
 int main(void) {
     init();
 
+    gpio_set_dir(&LED, true);
+    gpio_set(&LED, false);
     printf("Hello from System76 EC for the Arduino Micro!\n");
     for (;;) {
         int c = getchar();
diff --git a/src/board/arduino/uno/README.md b/src/board/arduino/uno/README.md
index ca7a90d..4dca1f9 100644
--- a/src/board/arduino/uno/README.md
+++ b/src/board/arduino/uno/README.md
@@ -1,3 +1,3 @@
 # Arduino Uno
 
-![Arduino Uno Pinout](https://upload.wikimedia.org/wikipedia/commons/c/c9/Pinout_of_ARDUINO_Board_and_ATMega328PU.svg)
+![Arduino Uno Pinout](https://arduino.pinout.guide/arduino_uno_and_atmega328_pinout.png)