59 lines
1.7 KiB
Markdown
59 lines
1.7 KiB
Markdown
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# RPi-ATX-LCD-Breakout
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This board allows you to connect an ATX power supply and a HD44780-comptible LCD
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screen to your Raspberry Pi (or others with compatible GPIO layout).
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While it does have a 40pin GPIO connector, it will also work with older
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26-pin variants of the Pi.
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The board was created to provide a convenient interface for two
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[Octoprint](http://octoprint.org/) plugins: PSUControl and LCD-HD44780 (See
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links on bottom of this page).
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The board itself offers a variety of features:
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* Powering the Pi using +5VSB (standby power)
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* Switching the PSU on and off using GPIO Pin 12
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The GPIO pin can be connected to PS_ON directly, or via a transistor. This is
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choosable using the three-pin jumper switch.
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Alternatively, the PSU can be forced to be on, by using the 2-pin PS_ON
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jumper.
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* Connecting a character LCD to the Pi
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LCD is wired as follows:
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<dl>
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<dt>Register Select</dt>
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<dd>15</dd>
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<dt>Enable</dt>
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<dd>16</dd>
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<dt>Data 4</dt>
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<dd>21</dd>
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<dt>Data 5</dt>
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<dd>22</dd>
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<dt>Data 6</dt>
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<dd>23</dd>
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<dt>Data 7</dt>
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<dd>24</dd>
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</dl>
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Data 0-3 pins are not connected. Read/Write select has been wired to GND, so
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it's not possible to read data from the LCD screen. Contrast pin is
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connected to a potentiometer.
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* Allow connecting of two fans, one 5V, one 12V
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* Providing screw terminals for GND, +12V, +5VSB and +5V
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* Providing a USB outlet powered by +5VSB
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Note: All pin numbers use BOARD numbering.
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## Links
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* [OctoPrint-PSUControl](https://github.com/kantlivelong/OctoPrint-PSUControl) by kantlivelong
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* [Octoprint-LCD-HD44780](https://github.com/Kunsi/Octoprint-LCD-HD44780) by Kunsi
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