phyduino/04_communication/physical_pixel/main.py

Turns the on-board LED on when it receives "H" and off when it receives "L" from the computer. Type the letters in the REPL terminal while the script runs: in PyCharm, run it with Execute File in REPL and type in the REPL tab. mpremote run doesn't pass typed letters on, so copy it to the board as main.py, press RESET, then type in mpremote repl. sys.stdin.read(1) waits for the next character, so the loop pauses until one arrives.

# Turns the on-board LED on when it receives "H" and off when it receives "L"
# from the computer. Type the letters in the REPL terminal while the script
# runs: in PyCharm, run it with Execute File in REPL and type in the REPL tab.
# mpremote run doesn't pass typed letters on, so copy it to the board as
# main.py, press RESET, then type in mpremote repl.
#
# sys.stdin.read(1) waits for the next character, so the loop pauses until
# one arrives.
 
import sys  # sys.stdin: characters typed in the terminal
 
import phyduino as mcu  # the Phyduino Pico library, used as mcu.<name>
 
mcu.led.off()  # start with the LED off
print("Type H to turn the LED on, L to turn it off.")
 
while True:  # repeats until stopped: Interrupt in PyCharm, or mpremote soft-reset
    char = sys.stdin.read(1)  # wait for one character from the terminal
    if char == "H":
        mcu.led.on()
    elif char == "L":
        mcu.led.off()
    # Any other character is ignored.