first commit

fan_control.py

@@ -0,0 +1,67 @@
+#!/usr/bin/env python3
+"""
+Ultra-responsive fan control – every key press is sent instantly.
+Uses raw stdin + select() with zero timeout.
+"""
+import serial
+import sys
+import select
+import termios
+import tty
+import serial.tools.list_ports
+
+# -------------------------------------------------
+# Auto-detect Arduino port
+# -------------------------------------------------
+def find_arduino():
+    for p in serial.tools.list_ports.comports():
+        if 'Arduino' in p.description or 'ACM' in p.device or 'USB' in p.device:
+            return p.device
+    return None
+
+PORT = find_arduino() or '/dev/ttyACM0'
+BAUD = 115200
+
+# -------------------------------------------------
+def raw_stdin():
+    """Put stdin into raw mode and return old settings."""
+    fd = sys.stdin.fileno()
+    old = termios.tcgetattr(fd)
+    tty.setraw(fd)
+    return old
+
+# -------------------------------------------------
+def main():
+    # --- open serial -------------------------------------------------
+    try:
+        ser = serial.Serial(PORT, BAUD, timeout=0)   # non-blocking
+    except Exception as e:
+        sys.exit(f"Cannot open {PORT}: {e}")
+
+    print(f"Connected to {PORT}")
+    print("Keys: 0-9, f=full, s=stop, q=quit   (every press is sent immediately)")
+
+    old_term = raw_stdin()
+    try:
+        while True:
+            # ---- non-blocking read from keyboard (0-second timeout) ----
+            rlist, _, _ = select.select([sys.stdin], [], [], 0)
+            if rlist:
+                key = sys.stdin.read(1)          # exactly one char
+                if key.lower() == 'q':
+                    print("\nBye!")
+                    break
+                ser.write(key.encode())          # send raw byte
+                print(f" → {key}", end='', flush=True)
+
+            # ---- echo any reply from Arduino (non-blocking) ----
+            if ser.in_waiting:
+                reply = ser.read(ser.in_waiting).decode(errors='ignore')
+                print(reply, end='', flush=True)
+
+    finally:
+        termios.tcsetattr(sys.stdin.fileno(), termios.TCSADRAIN, old_term)
+        ser.close()
+
+if __name__ == '__main__':
+    main()