Lucca Pirovano
68 lines
2.1 KiB
Python
68 lines
2.1 KiB
Python
#!/usr/bin/env python3
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"""
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Ultra-responsive fan control – every key press is sent instantly.
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Uses raw stdin + select() with zero timeout.
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"""
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import serial
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import sys
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import select
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import termios
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import tty
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import serial.tools.list_ports
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# -------------------------------------------------
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# Auto-detect Arduino port
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# -------------------------------------------------
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def find_arduino():
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for p in serial.tools.list_ports.comports():
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if 'Arduino' in p.description or 'ACM' in p.device or 'USB' in p.device:
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return p.device
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return None
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PORT = find_arduino() or '/dev/ttyACM0'
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BAUD = 115200
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# -------------------------------------------------
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def raw_stdin():
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"""Put stdin into raw mode and return old settings."""
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fd = sys.stdin.fileno()
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old = termios.tcgetattr(fd)
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tty.setraw(fd)
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return old
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# -------------------------------------------------
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def main():
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# --- open serial -------------------------------------------------
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try:
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ser = serial.Serial(PORT, BAUD, timeout=0) # non-blocking
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except Exception as e:
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sys.exit(f"Cannot open {PORT}: {e}")
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print(f"Connected to {PORT}")
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print("Keys: 0-9, f=full, s=stop, q=quit (every press is sent immediately)")
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old_term = raw_stdin()
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try:
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while True:
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# ---- non-blocking read from keyboard (0-second timeout) ----
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rlist, _, _ = select.select([sys.stdin], [], [], 0)
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if rlist:
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key = sys.stdin.read(1) # exactly one char
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if key.lower() == 'q':
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print("\nBye!")
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break
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ser.write(key.encode()) # send raw byte
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print(f" → {key}", end='', flush=True)
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# ---- echo any reply from Arduino (non-blocking) ----
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if ser.in_waiting:
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reply = ser.read(ser.in_waiting).decode(errors='ignore')
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print(reply, end='', flush=True)
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finally:
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termios.tcsetattr(sys.stdin.fileno(), termios.TCSADRAIN, old_term)
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ser.close()
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if __name__ == '__main__':
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main()
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