2017-06-12 20:52:31 +00:00
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# RPi-ATX-LCD-Breakout
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2017-07-24 12:31:53 +00:00
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This board allows you to connect an ATX power supply and a HD44780-compatible LCD
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2017-06-12 20:52:31 +00:00
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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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2017-06-14 20:31:09 +00:00
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[Octoprint](http://octoprint.org/) plugins:
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[PSUControl](https://github.com/kantlivelong/OctoPrint-PSUControl) and
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[LCD-HD44780](https://github.com/Kunsi/Octoprint-LCD-HD44780) (See links on
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bottom of this page).
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2017-06-12 20:52:31 +00:00
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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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2017-06-12 20:52:31 +00:00
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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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2017-06-14 20:31:09 +00:00
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* Providing a "is the PSU on"-detection by wiring GPIO pin 11 to the 3v3 rail
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of the PSU
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2017-06-12 20:52:31 +00:00
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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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2017-06-12 21:07:27 +00:00
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## Cost
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Prices are in Euro, and are based on my prototype production cost
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Item | Count | Price | Link
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----------------|---------:|------:|---
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PCB | 1 | 1.70 | [PCBway](https://www.pcbway.com/) got me 10 boards for 17$
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Fan connector | 2 | 0.42 | <https://www.reichelt.de/?ARTICLE=185658>
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Pin header | 3+2 wide | 0.09 | <https://www.reichelt.de/?ARTICLE=119891>
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Potentiometer | 1 | 0.38 | <https://www.reichelt.de/?ARTICLE=14951>
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LCD connector | 1 | 0.52 | <https://www.reichelt.de/?ARTICLE=175351>
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Screw terminals | 2 | 0.42 | <https://www.reichelt.de/?ARTICLE=170222>
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Jumper | 1 | 0.03 | <https://www.reichelt.de/?ARTICLE=119944>
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USB connector | 1 | 0.20 | <https://www.reichelt.de/?ARTICLE=22184>
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Transistor | 1 | 0.09 | <https://www.reichelt.de/?ARTICLE=1999>
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Resistors | 1+1+1 | 0.30 | <https://www.reichelt.de/?ARTICLE=1381><br> <https://www.reichelt.de/?ARTICLE=1315><br> <https://www.reichelt.de/?ARTICLE=1338>
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GPIO connector | 1 | 0.11 | [https://de.aliexpress.com/…/32454935478.html](https://de.aliexpress.com/item/100pcs-lot-2-54mm-Double-Row-Female-12P-Straight-Header-Pitch-Socket-Strip-2X20-Pin/32454935478.html)
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ATX connector | 1 | 0.43 | <http://www.mouser.de/ProductDetail/TE-Connectivity/1-1775099-3/>
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2017-06-12 20:52:31 +00:00
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## Links
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2017-06-14 20:31:09 +00:00
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* [Octoprint](http://octoprint.org/)
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2017-06-12 20:52:31 +00:00
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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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