diff --git a/src/modules/info_001_serial_number/3d/.gitignore b/src/modules/info_001_serial_number/3d/.gitignore
new file mode 100644
index 0000000..1567411
--- /dev/null
+++ b/src/modules/info_001_serial_number/3d/.gitignore
@@ -0,0 +1 @@
+*.stl
diff --git a/src/modules/info_001_serial_number/3d/case.scad b/src/modules/info_001_serial_number/3d/case.scad
new file mode 100644
index 0000000..45fe966
--- /dev/null
+++ b/src/modules/info_001_serial_number/3d/case.scad
@@ -0,0 +1,49 @@
+$fn=500;
+screen_width=72;
+screen_height=26;
+case_wall=0.9;
+inner_size=95;
+outer_size=inner_size+2*case_wall;
+cut=100;
+layer=0.3;
+height=50;
+m3_hole = 3.4;
+
+module top() {
+    difference() {
+        cylinder(d=inner_size, h=case_wall);
+        cube(size=[screen_width, screen_height, cut], center=true);
+        translate([0, inner_size/2, 0]) cylinder(r=5, h=cut);
+        translate([0, -inner_size/2, 0]) cylinder(r=5, h=cut);
+    }
+    translate([0, screen_height, case_wall]) 
+    linear_extrude(height=case_wall+2*layer, center=true, convexity=10, twist=0) {
+        text("Serial", halign="center", font="Liberation Mono:style=Bold");
+    }
+}
+
+module bottom() {
+    difference() {
+        cylinder(d=outer_size, h=height);
+        union() {
+            translate([0, 0, case_wall]) cylinder(d=inner_size-4, h=cut);
+            translate([0, 0, 50-case_wall]) cylinder(d=inner_size+0.5, h=cut);
+            translate([0, 0, 10]) rotate([0, 90, 0]) cylinder(d=12, h=cut);
+            translate([20, 20, -1]) cylinder(d=m3_hole, h=cut);
+            translate([20, -20, -1]) cylinder(d=m3_hole, h=cut);
+            translate([-20, 20, -1]) cylinder(d=m3_hole, h=cut);
+            translate([-20, -20, -1]) cylinder(d=m3_hole, h=cut);
+        }
+    }
+    intersection() {
+        cylinder(d=outer_size, h=height);
+        union() {
+            translate([0, inner_size/2, 0]) cylinder(r=5-0.25, h=height);
+            translate([0, -inner_size/2, 0]) cylinder(r=5-0.25, h=height);
+        }
+    }
+    
+}
+
+%translate([0, 0, height-case_wall]) top();
+bottom();
\ No newline at end of file
diff --git a/src/modules/info_001_serial_number/info_serial_number.ino b/src/modules/info_001_serial_number/info_001_serial_number.ino
similarity index 74%
rename from src/modules/info_001_serial_number/info_serial_number.ino
rename to src/modules/info_001_serial_number/info_001_serial_number.ino
index 6d402b6..563c769 100644
--- a/src/modules/info_001_serial_number/info_serial_number.ino
+++ b/src/modules/info_001_serial_number/info_001_serial_number.ino
@@ -14,38 +14,25 @@ The serial number consists of capital letters and numbers, and is guaranteed to
 at least one capital letter and one number.
 */
 
-
+#include <Wire.h>
 #include <obus_module.h>
-#include <LiquidCrystal.h>
-
-// Pins for the Hitachi HD44780 LCD controller
-#define PIN_LCD_RS     7 // Register Select. RS=0: Command, RS=1: Data
-#define PIN_LCD_ENABLE 6 // Enable (aka Clock). A falling edge on this pin triggers execution
-#define PIN_LCD_D0     5
-#define PIN_LCD_D1     4
-#define PIN_LCD_D2     3
-#define PIN_LCD_D3     2
+#include <LiquidCrystal_I2C.h>
 
 #define SERIAL_NUMBER_SIZE 7
+LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows
 
-uint8_t serial_number[SERIAL_NUMBER_SIZE];
+uint8_t serial_number[SERIAL_NUMBER_SIZE] = {'A', '0', '0', '0', '0', '0',' 0'};
 
 // true when we need to update the LCD display
-bool render_now = false;
-LiquidCrystal lcd(
-		PIN_LCD_RS,
-		PIN_LCD_ENABLE,
-		PIN_LCD_D0,
-		PIN_LCD_D1,
-		PIN_LCD_D2,
-		PIN_LCD_D3
-);
+bool render_now = true;
 
 
 void setup() {
 	Serial.begin(115200);
-	lcd.begin(16, 2);
-	lcd.clear();
+	lcd.init(); // initialize the lcd
+  	lcd.backlight();
+	lcd.setCursor(0, 0);
+  	lcd.print("init");
 	obus_module::setup(OBUS_TYPE_INFO, 1);
 }