Some code to allow me to Control Farm Together 2 with the Keybow2040 from Pimoroni

code.py

# SPDX-FileCopyrightText: 2021 Sandy Macdonald
#
# SPDX-License-Identifier: MIT

# A simple example of how to set up a keymap and HID keyboard on Keybow 2040.

# You'll need to connect Keybow 2040 to a computer, as you would with a regular
# USB keyboard.

# Drop the `pmk` folder
# into your `lib` folder on your `CIRCUITPY` drive.

# NOTE! Requires the adafruit_hid CircuitPython library also!

from pmk import PMK
from pmk.platform.keybow2040 import Keybow2040 as Hardware          # for Keybow 2040
# from pmk.platform.rgbkeypadbase import RGBKeypadBase as Hardware  # for Pico RGB Keypad Base

import usb_hid
from adafruit_hid.keyboard import Keyboard
from adafruit_hid.keyboard_layout_us import KeyboardLayoutUS
from adafruit_hid.keycode import Keycode
import time


# Set up Keybow
keybow = PMK(Hardware())
keys = keybow.keys

# Set up the keyboard and layout
keyboard = Keyboard(usb_hid.devices)
layout = KeyboardLayoutUS(keyboard)

# A map of keycodes that will be mapped sequentially to each of the keys, 0-15
keymap =    [Keycode.SHIFT,  #0
             Keycode.ONE,    #1
             Keycode.TWO,    #2
             Keycode.ESCAPE, #3
             Keycode.V,      #4
             Keycode.V,      #5
             Keycode.A,      #6
             Keycode.M,      #7
             Keycode.M,      #8
             Keycode.NINE,   #9
             Keycode.S,      #10
             Keycode.W,      #11
             Keycode.Q,      #12
             Keycode.D,      #13 
             Keycode.D,      #14
             Keycode.V]      #15
             
colors = [
    (255, 0, 0),    # 0
    (0, 0, 0),  # 1
    (0, 0, 0),  # 2
    (255, 165, 0),    # 3
    (0, 0, 255),     # 4
    (0, 0, 0),    # 5
    (0, 255, 0),    # 6
    (255, 0, 255), # 7
    (255, 0, 255),     # 8
    (0, 0, 0),  # 9
    (0, 255, 0),    # 10
    (0, 255, 0),    # 11
    (0, 0, 255),     # 12
    (0, 0, 0),    # 13
    (0, 255, 0),    # 14
    (0, 255, 255) # 15
]

def set_key_colors():
    for i in range(16):
        r, g, b = colors[i]
        keys[i].set_led(r, g, b)            

set_key_colors()

last_activity_time = time.time()  # Initialize the last activity time
leds_off = False  # Track if LEDs are off

def reset_activity_timer():
    global last_activity_time, leds_off
    last_activity_time = time.time()
    if leds_off:
        set_key_colors()
        leds_off = False


    
# Attach handler functions to all of the keys
for key in keys:
    # A press handler that sends the keycode and turns on the LED
    @keybow.on_press(key)
    def press_handler(key):
        reset_activity_timer()
        keycode = keymap[key.number]
        keyboard.press(keycode)
        key.set_led(255, 0, 0)  # Red when pressed

    # A release handler that turns off the LED
    @keybow.on_release(key)
    def release_handler(key):
        reset_activity_timer()
        keycode = keymap[key.number]
        r, g, b = colors[key.number]
        key.set_led(r, g, b)
        #key.led_off()
        keyboard.release(keycode)

while True:
    # Always remember to call keybow.update()!
    keybow.update()
    
    # Check for inactivity
    if time.time() - last_activity_time > 60:  # 300 seconds = 5 minutes
        if not leds_off:
            for key in keys:
                key.led_off()  # Turn off all LEDs
            leds_off = True