diff --git a/ES/Lab/Lab8/7SegUpDown-Switch.c b/ES/Lab/Lab8/7SegUpDown-Switch.c
new file mode 100644
index 0000000..7a5a1e4
--- /dev/null
+++ b/ES/Lab/Lab8/7SegUpDown-Switch.c
@@ -0,0 +1,47 @@
+#include <LPC17xx.h>
+
+int main(void){
+    unsigned long i, j, n;
+		unsigned int x;
+    unsigned long number = 0;
+    unsigned long count = 0;
+    unsigned char seven_seg[16] = {
+        0x3F, 0x06, 0x5B, 0x4F,
+        0x66, 0x6D, 0x7D, 0x07,
+        0x7F, 0x6F, 0x77, 0x7C,
+        0x39, 0x5E, 0x79, 0x71
+    };
+
+    LPC_PINCON->PINSEL0 = 0;
+    LPC_GPIO0->FIODIR |= (0xFF << 4);
+    LPC_PINCON->PINSEL3 = 0;
+    LPC_GPIO1->FIODIR |= (0x0F << 23);
+    LPC_GPIO0->FIODIR &= ~(1 << 21);
+
+    while (1) {
+        n = number;
+				x = LPC_GPIO0->FIOPIN & (1 << 21);
+			
+        for (i = 0; i < 4; i++) {
+            LPC_GPIO1->FIOCLR = (0x0F << 23);
+            LPC_GPIO1->FIOSET = (i << 23);
+            LPC_GPIO0->FIOCLR = (0xFF << 4);
+            LPC_GPIO0->FIOSET = ((unsigned long)seven_seg[n % 10] << 4);
+            n = n / 10;
+            for (j = 0; j < 1000; j++);
+            LPC_GPIO0->FIOCLR = (0xFF << 4);
+        }
+
+        count++;
+        if (count == 1000) {
+            count = 0;
+            if (x) {
+                number = (number + 1) % 10000;
+            } else {
+                if (number == 0) number = 9999;
+                else number--;
+            }
+        }
+    }
+
+}