diff --git a/src/TestBuild/TestBuild.ino b/src/TestBuild/TestBuild.ino
deleted file mode 100644
index 4149c43..0000000
--- a/src/TestBuild/TestBuild.ino
+++ /dev/null
@@ -1,15 +0,0 @@
-int PIN = 10; // 赤色LED G10
-//int PIN = 9; // Ir LED (カメラには映りますが、肉眼では見えません) G9
-// その他、G0 (0) , G25 (25), G26 (26) がつかえます。
-// https://lang-ship.com/blog/work/m5stickc-io/
-
-void setup() {
-  pinMode(PIN, OUTPUT); // PINのモード設定
-}
-
-void loop() {
-  digitalWrite(PIN, HIGH); // HIGH = 1
-  delay(1000);
-  digitalWrite(PIN, LOW); // LOW = 0
-  delay(500);
-}
\ No newline at end of file
diff --git a/src/TestBuild/build/esp32.esp32.m5stick-c/TestBuild.ino.bin b/src/TestBuild/build/esp32.esp32.m5stick-c/TestBuild.ino.bin
deleted file mode 100644
index 6ae298b..0000000
--- a/src/TestBuild/build/esp32.esp32.m5stick-c/TestBuild.ino.bin
+++ /dev/null
Binary files differ
diff --git a/src/TestBuild/build/esp32.esp32.m5stick-c/TestBuild.ino.elf b/src/TestBuild/build/esp32.esp32.m5stick-c/TestBuild.ino.elf
deleted file mode 100755
index 8f1d485..0000000
--- a/src/TestBuild/build/esp32.esp32.m5stick-c/TestBuild.ino.elf
+++ /dev/null
Binary files differ
diff --git a/src/TestBuild/monitor.sh b/src/TestBuild/monitor.sh
new file mode 100755
index 0000000..b558235
--- /dev/null
+++ b/src/TestBuild/monitor.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+# get serial port via board list, choose lines including "USB", and pick up 1st word
+serial=`arduino-cli board list | grep USB | awk '{print $1}'`
+
+echo ${serial}
+
+# open serial monitor (CTRL+C to quit)
+arduino-cli monitor -p ${serial} 
diff --git a/src/Upload.sh b/src/Upload.sh
index f485e30..9a6b092 100755
--- a/src/Upload.sh
+++ b/src/Upload.sh
@@ -22,7 +22,7 @@
   file=${ary[$input]}
   cp ${file} TestBuild/TestBuild.ino
   cd TestBuild
-  ./compile.sh && ./upload.sh
+  ./compile.sh && ./upload.sh && ./monitor.sh
   cd .. 
 else
   echo "Sorry, ${input} is not found."