Differences

This shows you the differences between two versions of the page.

--- setting_up_the_slave_umds [2016/12/21 17:51] – walkeradmin
+++ setting_up_the_slave_umds [2023/03/09 22:35] (current) – external edit 127.0.0.1
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-<color red>This page is work in progress and is incomplete</color>
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     sudo nano /etc/dhcpdc.conf
-    Add these lines to the end of the file (default is dhcp) using  your own IP Address details
+    Add these lines to the end of the file (default is dhcp) using your own IP Address details
     eth0
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 To test this, reboot and the LCD should start up automatically (the LCD won't clear on boot, but wait for the "Waiting for 5 Seconds for Network Start" message).
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+\\
+----
+===== UMDsiplay0x.py File Differences =====
+\\
+There are a couple of differences between the Python scripts on the Master and the slaves, here is an overview of those differences.
+\\
+\\
+==== #import ====
+\\
+On the #import section there is one difference
+<file>
+Master                                  Slave
+#import                                 #import
+import RPi.GPIO as GPIO                 import RPi.GPIO as GPIO
+import time                             import time
+import socket                           import socket
+import fcntl                            import fcntl
+import struct                           import struct
+                                        import os
+</file>
+\\
+On the slave there is an extra library that is imported (the os library). The <color red>os library</color> allows the running of command lines from within Python.
+\\
+\\
+----
+==== Program Start ====
+At the Program Start section of the Python code there is an extra line.
+\\
+    ## Get text file from master Pi UMD001 (runs the file getData in the Python folder)
+    os.system("/home/pi/Python/getData")
+\\
+The <color red>os.system("/home/pi/Python/getData")</color> calls the getData script. This is the script that pulls the latest my_data.txt file from the UMD Master. This command is the one that needs the extra #import library.
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