![]() The code above creates an instance of the PicoChord class by calling the constructormethod for that class. Switch(pin=board.GP10,pixel=5,bit=32) # little Switch(pin=board.GP12,pixel=3,bit=8), # middle Switch(pin=board.GP13,pixel=2,bit=4), # index Switch(pin=board.GP14,pixel=1,bit=2), # thumb Switch(pin=board.GP15,pixel=0,bit=1), # control Keyboard = PicoChord (i2c_sda=board.GP0, i2c_scl=board.GP1, You can use different GPIO pins in your circuit, and even change the order of the LED colours by modifying the code that creates the keyboard object in the program. Red and black wires provide the power, yellow wires transfer the signal for the NeoPixel, and the other colours are signals for the switches.įigure 4 shows the complete circuit diagram for the keyboard. The Raspberry Pi Pico fits alongside the display to reduce the height of the case. The keys are pushed into the outside of the case through square holes and the NeoKey boards are then plugged onto the back of the key inside the case. The keys for the thumb are on the rightįigure 3 shows the inside of the box. This is useful if you want to use the boards in a keyboard matrix, but it slightly complicates our wiring because each key needs a ground connection for the power to the NeoPixel LED and another to bias the diode in the switch circuit.įigure 3 – This shows the underneath of the keyboard. ![]() This is because a NeoKey board contains a diode that is connected in series with the key switch. These are black wires at the bottom of the image. If you look carefully at Figure 2, you’ll notice that there are two ground connections for each NeoKey. ![]() It also contains a NeoPixel that can be used to illuminate the key. The NeoKey contains a socket for a CHERRY MX-compatible key switch. The pixels are connected to GPIO 17 on the Pico and the switches are connected to GPIO 14 and GPIO 15įigure 2 shows a couple of Adafruit NeoKey breakout boards connected to a Raspberry Pi Pico. The white wires link the NeoPixels on each key and the yellow wires are used for the data signals from each key to the Pico. Figure 2 – The key switch on the left has been removed to show the NeoKey breakout underneath.
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