Differences

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

--- inverted_led_display [2017/04/04 21:11] – created walkeradmin
+++ inverted_led_display [2017/04/04 22:04] (current) – walkeradmin
@@ Line 1: / Line 1: @@
 ====== Inverted LED Display ======
+<color darkorange>Apr 2017</color>
 \\
 \\
+----
+==== I made a mistake ====
+\\
+When I designed the PCB for this project. I did what most people would do and I made the PCB the 'right way up' with 40 Way Raspberry pi header and the 7 Segment LED also the normal way up (so you can read it). Later on I realised this was a bit of a mistake, because this means the Raspberry Pi Zero Power and USB connections are now at the bottom, so you can't power this up and put it on a table :(.
+\\
+\\
+Fear not though, with some help I have edited the code so that it writes the time upside-down, so if you rotate your Raspberry Pi 180° you can read the time correctly, and still put it on the table. Below is the adjusted code.
+\\
+\\
+<color #ed1c24>Please NOTE: </color> You do <color #ed1c24>NOT</color> have to rotate the 7 Segment LED on the PCB, the code does this for you.
+\\
+\\
+{{:ntp_normal.jpg?300|}}    {{:ntp_inverted.jpg?300|}}
+\\
+\\
+Above we can see the Clock working in 'Normal' mode on the left, and in 'Inverted' mode on the right.
+\\
+\\
+----
+==== The Python Code ====
+\\
 <sxh [py][; options for SyntaxHighlighter]>
 #! /usr/bin/python
@@ Line 24: / Line 45: @@
 # Define GPIO ports for the digits 0-3
-gpioDigits = (18,23,24,25)
 gpioDigits = (25,24,23,18)
 # Pins (12,9,8,6) select digits 0-3 respectively reading LTR on display