diff --git a/ESP32/holder.scad b/ESP32/holder.scad
new file mode 100644
index 0000000..9c29e28
--- /dev/null
+++ b/ESP32/holder.scad
@@ -0,0 +1,24 @@
+$fa=1;$fs=0.1;
+scale([10, 10, 10]) {
+// ground plate
+cube([10,10,0.25]);
+// RS232
+translate([0.3,0.3,0]) cylinder(r=0.1, h=0.75);
+translate([2.8,0.3,0]) cylinder(r=0.1, h=0.75);
+translate([0.3,2.1,0]) cylinder(r=0.1, h=0.75);
+translate([2.8,2.1,0]) cylinder(r=0.1, h=0.75);
+// SD card reader
+translate([10-0.5-0.15, 0.3,0]) cylinder(r=0.1, h=0.75);
+translate([10-0.5-1.95, 0.3,0]) cylinder(r=0.1, h=0.75);
+translate([10-0.5-0.15, 4.1,0]) cylinder(r=0.1, h=0.75);
+translate([10-0.5-1.95, 4.1,0]) cylinder(r=0.1, h=0.75);
+// lolin
+translate([0.3, 10-0.3-1.5, 0]) cylinder(r=0.1, h=0.75);
+translate([0.3, 8-0.3-1.5, 0]) cylinder(r=0.1, h=0.75);
+// side plane
+translate([0,9.95,0]) difference(){ cube([10,0.25,10]);
+    translate([-0.01,-0.1,7.01]) cube([3,0.7,3]);
+};
+translate([9.5,9,0]) cube([0.25,1,3]);
+translate([5.5,9,0]) cube([0.25,1,3]);
+}
\ No newline at end of file