OpenCode experiments...

gauge.py

@@ -152,19 +152,27 @@ ARDUINO_TX_PIN = int(_cfg.get("arduino_tx_pin", 17))
 ARDUINO_RX_PIN = int(_cfg.get("arduino_rx_pin", 16))
 ARDUINO_BAUD = int(_cfg.get("arduino_baud", 115200))
 
+_arduino = None
+
+
+def _ensure_arduino():
+    global _arduino
+    if _arduino is None:
         _arduino = UART(ARDUINO_UART_ID, baudrate=ARDUINO_BAUD, tx=ARDUINO_TX_PIN, rx=ARDUINO_RX_PIN, timeout=10)
+    return _arduino
 
 
 def arduino_send(cmd):
     """Send a newline-terminated command to the Arduino."""
-    _arduino.write((cmd + "\n").encode())
+    _ensure_arduino().write((cmd + "\n").encode())
     info(f"Arduino → {cmd}")
 
 
 def arduino_recv():
     """Print any lines waiting in the Arduino RX buffer."""
-    while _arduino.any():
-        line = _arduino.readline()
+    uart = _ensure_arduino()
+    while uart.any():
+        line = uart.readline()
         if line:
             print(f"[{_ts()}] ARDU   {line.decode().strip()}")
 
@@ -1333,6 +1341,8 @@ def main():
         _w.active(True)
     del _w
     gc.collect()
+    _ensure_arduino()
+    gc.collect()
     info("=" * 48)
     info("Gauge MQTT controller starting")
     info(f"Heap free: {gc.mem_free()} bytes")