HD44780-comptible -> HD44780-compatible
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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 itself offers a variety of features:
Powering the Pi using +5VSB (standby power)
Switching the PSU on and off using GPIO pin 12
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.
Providing a “is the PSU on”-detection by wiring GPIO pin 11 to the 3v3 rail of the PSU
Connecting a character LCD to the Pi
LCD is wired as follows:
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.
Allow connecting of two fans, one 5V, one 12V
Providing screw terminals for GND, +12V, +5VSB and +5V
Providing a USB outlet powered by +5VSB
Note: All pin numbers use BOARD numbering.
Prices are in Euro, and are based on my prototype production cost
|PCB||1||1.70||PCBway got me 10 boards for 17$|
|Pin header||3+2 wide||0.09||https://www.reichelt.de/?ARTICLE=119891|