Node-18: Led-17: Node-15: Resistor-14: Rail-13: lm555-12: Ground (0 V)-11: Capacitor-10: Node-9: Resistor-8: Resistor-7: Potentiometer-6: Node-5: Node-4: Node-3: Node-2: Connector-21: Connector-23: Connector-25: Connector-26: Connector-27: Connector-29: Connector-30: Connector-32: Connector-35: Connector-36: Connector-37: Connector-39: Connector-43: Connector-44: Connector-45: Connector-46: Connector-47: Connector-48: Connector-52: Connector-49: Connector-33: PlotterWidget-53: SerialPortWidget-54: