diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8d35cb3
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+__pycache__
+*.pyc
diff --git a/README.md b/README.md
index 2260f51..6374b6e 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,8 @@ Serial Client
 Preparation
 -----------
 
-Disable the login shell (raspi-config > Interfacing Options > Serial)
+1. Disable the login shell (raspi-config > Interfacing Options > Serial)
+2. Install Python3 modules (pip3 install serial python-crontab)
 
 Run
 ---
diff --git a/cron.py b/cron.py
new file mode 100755
index 0000000..2881499
--- /dev/null
+++ b/cron.py
@@ -0,0 +1,36 @@
+#!/usr/bin/env python3
+
+from crontab import CronTab
+import os
+import csv
+import sys
+
+def whereami():
+    return os.path.dirname(os.path.abspath(__file__))
+
+class Cron(CronTab):
+    def __init__(self, user=True):
+        CronTab.__init__(self, user=user)
+
+    def clearCron(self):
+        return self.remove_all()
+
+    def getJob(self, code):
+        return self.new(command="%s/send.py %s" % (whereami(), code))
+
+    def buildJob(self, code, minute=False, hour=False):
+        job = self.getJob(code)
+        job.setall(time(hour, minute))
+        job.enable()
+
+    def readCSV(self, path):
+        self.clearCron()
+        with open(path) as csvfile:
+            r = csv.DictReader(csvfile, [minute, hour, code])
+            for row in r:
+                self.buildJob(row["code"], row["minute"], row["hour"])
+        self.write()
+
+
+if __name__ == "__main__":
+    Cron().readCSV(sys.argv[1])
diff --git a/send.py b/send.py
new file mode 100755
index 0000000..c389af4
--- /dev/null
+++ b/send.py
@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+
+import time
+import serial
+import sys
+
+def sendMessage(code):
+    with serial.Serial(
+            port='/dev/ttyAMA0',
+            baudrate = 9600,
+            parity=serial.PARITY_NONE,
+            stopbits=serial.STOPBITS_ONE,
+            bytesize=serial.EIGHTBITS,
+            timeout=1
+            ) as s:
+        s.write(code + "\r")
+
+if __name__ == "__main__":
+    sendMessage(sys.argv[1])