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under_monitor_displays [2016/12/21 14:48] – walkeradminunder_monitor_displays [2023/03/09 22:35] (current) – external edit 127.0.0.1
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 ====== Under Monitor Displays ====== ====== Under Monitor Displays ======
 +<color orange>Dec 2016</color>
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-{{:rpi_umd_001b.jpg?650|}} 
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-<color Red>This Project is work in progress</color>+{{:alan_lcd_parts.2.crop.jpg?500|}}
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-While these can be purchased, they can run in to sever thousand £ for each unit. We only require a simple low cost solution, for this we are using LCD displays that we already own (2 x 40 Char displays from RX units that we are scrapping). These displays will be driven from Raspberry Pis, then input for the diplay messages will be via a web interface to the primary Raspberry Pi.+While these can be purchased, they can run in to sever thousand £ for each unit. We only require a simple low cost solution, for this we are using LCD displays that we already own (2 x 40 Char displays from RX units that we are scrapping). These displays will be driven from Raspberry Pis, then input for the display messages will be via a web interface to the primary Raspberry Pi.
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-{{:8monitorumd.jpg?900|}}+{{:8monitorumd.jpg?600|}}
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 +  * [[What this Project Requires]]\\ 
 +  * [[Circuit Diagrams and PCBs]]\\ 
   * [[Setting up the Master UMD]]\\    * [[Setting up the Master UMD]]\\ 
   * [[Setting up the Slave UMDs]]\\    * [[Setting up the Slave UMDs]]\\ 
-\\  +  * [[The Python Code]]\\  
-\\  +  * [[Code Files]]\\ 
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----- +
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-----+
  
-===== Slave Raspberry Pi(s) ===== +  * [[A Massive Gotchya]]\\ 
-\\ +
-The slave Raspberry Pi(s) download the latest 'my_data.txt' from the Master Raspberry Pi (once a second) so that each slave knows what to display. The 'my_data.txt' file is downloaded using a wget command.+
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-\\  
-The 'my_data.txt' file has 8 lines, each line is for a particular display, so for example, line 1 & 2 are for LCD1 and reference monitors 1 and 2. Lines 5 & 6 are for LCD and reference monitors 5 & 6. 
-\\  
-\\  
-    Install Raspbian (noobs or Jessie, doesn't matter) 
-    Update pi - sudo apt-get update && sudo apt-get upgrade -y  
-    Install xrdp (this so we can access the R-pi using RDP if required) 
-    Create Python folder (/home/pi/Python) 
-     
-    Copy files to python folder:  (might have to change file/folder permissions to www-data) 
-        getData (downloads via wget the_data.txt file) 
-        UMDisplay0x.py (the code that writes to the display) 
-        my_data.txt (contains the 8 lines for the displays, this will be updated by getData) 
-        launchUMD.sh (autorun script) 
-     
-    Add line to crontab for autoboot 
-    Add Python/logs folder  
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-\\  
-===== Wiring ===== 
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-The 2 Line is wired to the Raspberry Pi using the following pin out. 
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-{{:pi_lcd_numbers.jpg?300|}} 
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-<color red>NOTE The Pin out shows Pin 14 of the 40Way Pi header connected, but the diagram does not, this is because Pin 14 is GND, so any ground point can be used.</color> 
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-**For this project I am getting some circuit boards made, with a layout similar to this:** 
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-{{:40x2_lcd_pcb_mk2..jpg?500|}} 
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-This circuit board has a 40 pin header to fit to the Raspberry Pi via a ribbon cable, a 16 pin header to fit to the LCD via a ribbon cable. There are two Variable Resistors to adjust the LCD intensity and back-light. There is a 6 way header to allow the addition of three buttons, these will have the following function: 
-\\  
-  - Display IP Address 
-  - Blank Line 1 
-  - Blank Line 2 
-As the IP addresses on the Raspberry Pi will be DHCP (so we can access them from the corporate network) we might need to check the IP addresses from time to time, as these units are headless, a button to display the IP Address on the LCD display will be useful. 
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-Buttons 2 and 3 are to blank the lines on the LCD, this is so that when doing a 'show and tell' with customers, we can keep them guessing before revealing the content types on the montiors. 
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-===== LCD PCB ===== 
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-Here is the PCB, I had a slight issue with the tracks, and to solve this I had to mount the 16 pin header on the bottom of the PCB (the left and right hand pins of the 16W connector would have to be swapped if you wanted to mount the header on the top of the PCB) 
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-{{::lcd_pcb_top.jpg?400|}} 
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-{{::lcd_pcb_bottom.jpg?400|}} 
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-There are an extra 6 pins for additional GPIO connectivity (they will all connect to ground via a 10KR resistor if fitted. While there are 8 pins, only the upper 6 are fitted. 
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-{{::lcd_pcb_blank.jpg?300|}} 
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-The initial functionality for these will be for 3 buttons: 
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-    1. Hide Line 1 
-    2. Hide Line 2 
-    3. Show IP 
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-Finished LCD PCB running on a Pi Zero. 
-\\  
-{{::lcd_pcb_working.jpg?600|}} 
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 +{{:rpi_umd_001b.jpg?650|}}
under_monitor_displays.1482331731.txt.gz · Last modified: 2023/03/09 22:35 (external edit)