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This board allows you to connect an ATX power supply and a HD44780-compatible LCD screen to your Raspberry Pi (or others with compatible GPIO layout).
While it does have a 40pin GPIO connector, it will also work with older 26-pin variants of the Pi.
The board was created to provide a convenient interface for two Octoprint plugins: PSUControl and LCD-HD44780 (See links on bottom of this page).
The board itself offers a variety of features:
The GPIO pin can be connected to PS_ON directly, or via a transistor. This is choosable using the three-pin jumper switch.
Alternatively, the PSU can be forced to be on, by using the 2-pin PS_ON jumper.
LCD is wired as follows:
<dt>Register Select</dt>
<dd>15</dd>
<dt>Enable</dt>
<dd>16</dd>
<dt>Data 4</dt>
<dd>21</dd>
<dt>Data 5</dt>
<dd>22</dd>
<dt>Data 6</dt>
<dd>23</dd>
<dt>Data 7</dt>
<dd>24</dd>
Data 0-3 pins are not connected. Read/Write select has been wired to GND, so it’s not possible to read data from the LCD screen. Contrast pin is connected to a potentiometer.
Note: All pin numbers use BOARD numbering.
Prices are in Euro, and are based on my prototype production cost
Item | Count | Price | Link |
---|---|---|---|
PCB | 1 | 1.70 | PCBway got me 10 boards for 17$ |
Fan connector | 2 | 0.42 | https://www.reichelt.de/?ARTICLE=185658 |
Pin header | 3+2 wide | 0.09 | https://www.reichelt.de/?ARTICLE=119891 |
Potentiometer | 1 | 0.38 | https://www.reichelt.de/?ARTICLE=14951 |
LCD connector | 1 | 0.52 | https://www.reichelt.de/?ARTICLE=175351 |
Screw terminals | 2 | 0.42 | https://www.reichelt.de/?ARTICLE=170222 |
Jumper | 1 | 0.03 | https://www.reichelt.de/?ARTICLE=119944 |
USB connector | 1 | 0.20 | https://www.reichelt.de/?ARTICLE=22184 |
Transistor | 1 | 0.09 | https://www.reichelt.de/?ARTICLE=1999 |
Resistors | 1+1+1 | 0.30 | https://www.reichelt.de/?ARTICLE=1381 https://www.reichelt.de/?ARTICLE=1315 https://www.reichelt.de/?ARTICLE=1338 |
GPIO connector | 1 | 0.11 | https://de.aliexpress.com/…/32454935478.html |
ATX connector | 1 | 0.43 | http://www.mouser.de/ProductDetail/TE-Connectivity/1-1775099-3/ |