{ "schema": "digital-logic-sim-web/1", "storageId": "multiplexer-2-1", "name": "2:1 Multiplexer", "createdAt": "2026-08-10T12:00:00.000Z", "updatedAt": "2026-08-11T00:26:06.605Z", "root": { "id": "root", "name": "2:1 Multiplexer", "type": "custom", "kind": "custom", "size": { "x": 760, "y": 440 }, "colour": "#202b3a", "nameLocation": "top", "inputPins": [], "outputPins": [], "instances": [ { "id": "input-d0", "name": "IN-1", "position": { "x": -600, "y": 0 }, "rotation": 0, "label": "D0 = 1", "internalData": {}, "linkedBusPairId": null, "outputPinColours": {} }, { "id": "input-d1", "name": "IN-1", "position": { "x": -600, "y": 120 }, "rotation": 0, "label": "D1 = 0", "internalData": {}, "linkedBusPairId": null, "outputPinColours": {} }, { "id": "input-select", "name": "IN-1", "position": { "x": -600, "y": -120 }, "rotation": 0, "label": "SELECT = 0", "internalData": {}, "linkedBusPairId": null, "outputPinColours": {} }, { "id": "mux", "name": "MUX 2:1", "position": { "x": -80, "y": 0 }, "rotation": 0, "label": "ONE-OF-TWO SELECTOR", "internalData": {}, "linkedBusPairId": null, "outputPinColours": {} }, { "id": "output-led", "name": "LED", "position": { "x": 440, "y": 0 }, "rotation": 0, "label": "SELECTED OUT", "internalData": {}, "linkedBusPairId": null, "outputPinColours": {} }, { "id": "output-pin", "name": "OUT-1", "position": { "x": 600, "y": 0 }, "rotation": 0, "label": "OUT", "internalData": {}, "linkedBusPairId": null, "outputPinColours": {} } ], "wires": [ { "id": "input-d0-mux", "source": { "owner": "input-d0", "pin": "0" }, "target": { "owner": "mux", "pin": "d0" }, "points": [], "colour": null }, { "id": "input-d1-mux", "source": { "owner": "input-d1", "pin": "0" }, "target": { "owner": "mux", "pin": "d1" }, "points": [], "colour": null }, { "id": "input-select-mux", "source": { "owner": "input-select", "pin": "0" }, "target": { "owner": "mux", "pin": "select" }, "points": [], "colour": null }, { "id": "mux-led", "source": { "owner": "mux", "pin": "out" }, "target": { "owner": "output-led", "pin": "0" }, "points": [], "colour": null }, { "id": "mux-output", "source": { "owner": "mux", "pin": "out" }, "target": { "owner": "output-pin", "pin": "0" }, "points": [], "colour": null } ], "junctions": [], "displays": [], "annotations": [ { "id": "mux-project-title", "type": "label", "text": "2:1 MULTIPLEXER — SELECT ONE INPUT", "position": { "x": -310, "y": -420 }, "width": 620, "height": 28, "fontSize": 14, "colour": "#f3d36b", "background": "#352e18" }, { "id": "mux-project-help", "type": "text", "text": "D0 and D1 are the data inputs.\nSELECT = 0 sends D0 to OUT.\nSELECT = 1 sends D1 to OUT.\nToggle SELECT, then step or bake to watch the LED change.", "position": { "x": -310, "y": -350 }, "width": 620, "height": 110, "fontSize": 11, "colour": "#d7eaff", "background": "#2f3338" } ] }, "customChips": { "MUX 2:1": { "id": "chip-mux-2-1", "name": "MUX 2:1", "type": "custom", "kind": "custom", "size": { "x": 360, "y": 240 }, "colour": "#647488", "nameLocation": "top", "inputPins": [ { "id": "d0", "name": "D0", "bits": 1, "direction": "input", "x": -420, "y": -120, "valueDisplay": "off", "colour": "gray" }, { "id": "d1", "name": "D1", "bits": 1, "direction": "input", "x": -420, "y": 0, "valueDisplay": "off", "colour": "gray" }, { "id": "select", "name": "SELECT", "bits": 1, "direction": "input", "x": -420, "y": 120, "valueDisplay": "off", "colour": "gray" } ], "outputPins": [ { "id": "out", "name": "OUT", "bits": 1, "direction": "output", "x": 420, "y": 0, "valueDisplay": "off", "colour": "green" } ], "instances": [ { "id": "not-select", "name": "NOT", "position": { "x": -160, "y": 0 }, "rotation": 0, "label": "NOT SELECT", "internalData": {}, "linkedBusPairId": null, "interfaceId": null, "outputPinColours": {} }, { "id": "and-d0", "name": "AND", "position": { "x": 0, "y": -60 }, "rotation": 0, "label": "D0 & !SELECT", "internalData": {}, "linkedBusPairId": null, "interfaceId": null, "outputPinColours": {} }, { "id": "and-d1", "name": "AND", "position": { "x": 0, "y": 60 }, "rotation": 0, "label": "D1 & SELECT", "internalData": {}, "linkedBusPairId": null, "interfaceId": null, "outputPinColours": {} }, { "id": "or-out", "name": "OR", "position": { "x": 160, "y": 0 }, "rotation": 0, "label": "SELECTED OUT", "internalData": {}, "linkedBusPairId": null, "interfaceId": null, "outputPinColours": {} }, { "id": "interface-input-d0", "name": "IN-1", "position": { "x": -320, "y": -120 }, "rotation": 0, "label": "D0", "internalData": {}, "linkedBusPairId": null, "interfaceId": "d0", "outputPinColours": {} }, { "id": "interface-input-d1", "name": "IN-1", "position": { "x": -320, "y": 0 }, "rotation": 0, "label": "D1", "internalData": {}, "linkedBusPairId": null, "interfaceId": "d1", "outputPinColours": {} }, { "id": "interface-input-select", "name": "IN-1", "position": { "x": -320, "y": 120 }, "rotation": 0, "label": "SELECT", "internalData": {}, "linkedBusPairId": null, "interfaceId": "select", "outputPinColours": {} }, { "id": "interface-output-out", "name": "OUT-1", "position": { "x": 320, "y": 0 }, "rotation": 0, "label": "OUT", "internalData": {}, "linkedBusPairId": null, "interfaceId": "out", "outputPinColours": {} } ], "wires": [ { "id": "d0-and", "source": { "owner": "interface-input-d0", "pin": "0" }, "target": { "owner": "and-d0", "pin": "0" }, "points": [], "colour": null }, { "id": "select-not", "source": { "owner": "interface-input-select", "pin": "0" }, "target": { "owner": "not-select", "pin": "0" }, "points": [], "colour": null }, { "id": "not-d0-and", "source": { "owner": "not-select", "pin": "1" }, "target": { "owner": "and-d0", "pin": "1" }, "points": [], "colour": null }, { "id": "d1-and", "source": { "owner": "interface-input-d1", "pin": "0" }, "target": { "owner": "and-d1", "pin": "0" }, "points": [], "colour": null }, { "id": "select-d1-and", "source": { "owner": "interface-input-select", "pin": "0" }, "target": { "owner": "and-d1", "pin": "1" }, "points": [], "colour": null }, { "id": "d0-or", "source": { "owner": "and-d0", "pin": "2" }, "target": { "owner": "or-out", "pin": "0" }, "points": [], "colour": null }, { "id": "d1-or", "source": { "owner": "and-d1", "pin": "2" }, "target": { "owner": "or-out", "pin": "1" }, "points": [], "colour": null }, { "id": "or-out-interface", "source": { "owner": "or-out", "pin": "2" }, "target": { "owner": "interface-output-out", "pin": "0" }, "points": [], "colour": null } ], "junctions": [], "displays": [], "annotations": [ { "id": "mux-title", "type": "label", "text": "2:1 MULTIPLEXER", "position": { "x": -190, "y": -330 }, "width": 380, "height": 26, "fontSize": 14, "colour": "#f3d36b", "background": "#352e18" }, { "id": "mux-formula", "type": "text", "text": "OUT = (D0 AND NOT SELECT) OR (D1 AND SELECT)\nSELECT=0 chooses D0; SELECT=1 chooses D1.", "position": { "x": -240, "y": -260 }, "width": 480, "height": 60, "fontSize": 11, "colour": "#d7eaff", "background": "#2f3338" } ], "interfaceBindings": { "inputs": [ { "publicId": "d0", "instanceId": "interface-input-d0", "pinId": "0", "direction": "input" }, { "publicId": "d1", "instanceId": "interface-input-d1", "pinId": "0", "direction": "input" }, { "publicId": "select", "instanceId": "interface-input-select", "pinId": "0", "direction": "input" } ], "outputs": [ { "publicId": "out", "instanceId": "interface-output-out", "pinId": "0", "direction": "output" } ] }, "fit": { "version": 1, "bounds": { "x": -420, "y": -200, "w": 840, "h": 400 } } }, "test": { "id": "chip-486127f5", "name": "test", "type": "custom", "kind": "custom", "size": { "x": 640, "y": 440 }, "colour": "#7358ad", "nameLocation": "top", "inputPins": [ { "id": "in-0", "name": "D0 = 1", "bits": 1, "direction": "input", "x": -700, "y": 0, "valueDisplay": "off", "colour": "gray" }, { "id": "in-1", "name": "D1 = 0", "bits": 1, "direction": "input", "x": -700, "y": 120, "valueDisplay": "off", "colour": "gray" }, { "id": "in-2", "name": "SELECT = 0", "bits": 1, "direction": "input", "x": -700, "y": -120, "valueDisplay": "off", "colour": "gray" } ], "outputPins": [ { "id": "out-0", "name": "OUT", "bits": 1, "direction": "output", "x": 700, "y": 0, "valueDisplay": "off", "colour": "green" } ], "instances": [ { "id": "input-d0", "name": "IN-1", "position": { "x": -600, "y": 0 }, "rotation": 0, "label": "D0 = 1", "internalData": {}, "linkedBusPairId": null, "interfaceId": "in-0", "outputPinColours": {} }, { "id": "input-d1", "name": "IN-1", "position": { "x": -600, "y": 120 }, "rotation": 0, "label": "D1 = 0", "internalData": {}, "linkedBusPairId": null, "interfaceId": "in-1", "outputPinColours": {} }, { "id": "input-select", "name": "IN-1", "position": { "x": -600, "y": -120 }, "rotation": 0, "label": "SELECT = 0", "internalData": {}, "linkedBusPairId": null, "interfaceId": "in-2", "outputPinColours": {} }, { "id": "mux", "name": "MUX 2:1", "position": { "x": -80, "y": 0 }, "rotation": 0, "label": "ONE-OF-TWO SELECTOR", "internalData": {}, "linkedBusPairId": null, "interfaceId": null, "outputPinColours": {} }, { "id": "output-led", "name": "LED", "position": { "x": 440, "y": 0 }, "rotation": 0, "label": "SELECTED OUT", "internalData": {}, "linkedBusPairId": null, "interfaceId": null, "outputPinColours": {} }, { "id": "output-pin", "name": "OUT-1", "position": { "x": 600, "y": 0 }, "rotation": 0, "label": "OUT", "internalData": {}, "linkedBusPairId": null, "interfaceId": "out-0", "outputPinColours": {} } ], "wires": [ { "id": "input-d0-mux", "source": { "owner": "input-d0", "pin": "0" }, "target": { "owner": "mux", "pin": "d0" }, "points": [], "colour": null }, { "id": "input-d1-mux", "source": { "owner": "input-d1", "pin": "0" }, "target": { "owner": "mux", "pin": "d1" }, "points": [], "colour": null }, { "id": "input-select-mux", "source": { "owner": "input-select", "pin": "0" }, "target": { "owner": "mux", "pin": "select" }, "points": [], "colour": null }, { "id": "mux-led", "source": { "owner": "mux", "pin": "out" }, "target": { "owner": "output-led", "pin": "0" }, "points": [], "colour": null }, { "id": "mux-output", "source": { "owner": "mux", "pin": "out" }, "target": { "owner": "output-pin", "pin": "0" }, "points": [], "colour": null } ], "junctions": [], "displays": [], "annotations": [ { "id": "mux-project-title", "type": "label", "text": "2:1 MULTIPLEXER — SELECT ONE INPUT", "position": { "x": -310, "y": -420 }, "width": 620, "height": 28, "fontSize": 14, "colour": "#f3d36b", "background": "#352e18" }, { "id": "mux-project-help", "type": "text", "text": "D0 and D1 are the data inputs.\nSELECT = 0 sends D0 to OUT.\nSELECT = 1 sends D1 to OUT.\nToggle SELECT, then step or bake to watch the LED change.", "position": { "x": -310, "y": -350 }, "width": 620, "height": 110, "fontSize": 11, "colour": "#d7eaff", "background": "#2f3338" } ], "interfaceBindings": { "inputs": [ { "publicId": "in-0", "instanceId": "input-d0", "pinId": "0", "direction": "input" }, { "publicId": "in-1", "instanceId": "input-d1", "pinId": "0", "direction": "input" }, { "publicId": "in-2", "instanceId": "input-select", "pinId": "0", "direction": "input" } ], "outputs": [ { "publicId": "out-0", "instanceId": "output-pin", "pinId": "0", "direction": "output" } ] }, "fit": { "version": 1, "bounds": { "x": -700, "y": -240, "w": 1400, "h": 480 } } } }, "collections": [ { "name": "LOGIC", "chips": [ "AND", "OR", "NOT", "NAND", "NOR", "XOR", "XNOR", "BUFFER" ] }, { "name": "BASIC", "chips": [ "CLOCK", "PULSE", "KEY", "3-STATE BUFFER" ] }, { "name": "IN/OUT", "chips": [ "IN-1", "IN-4", "IN-8", "OUT-1", "OUT-4", "OUT-8" ] }, { "name": "MERGE/SPLIT", "chips": [ "1-4BIT", "1-8BIT", "4-8BIT", "4-1BIT", "8-4BIT", "8-1BIT" ] }, { "name": "BUS", "chips": [ "BUS-1", "BUS-4", "BUS-8" ] }, { "name": "DISPLAY", "chips": [ "7-SEGMENT", "DOT DISPLAY", "RGB DISPLAY", "LED" ] }, { "name": "MEMORY", "chips": [ "ROM 256x16", "dev.RAM-8" ] }, { "name": "AUDIO", "chips": [ "BUZZER" ] } ], "collectionOrder": [ "LOGIC", "BASIC", "IN/OUT", "MERGE/SPLIT", "BUS", "DISPLAY", "MEMORY", "AUDIO", "CUSTOM" ], "starred": [ "IN/OUT", "MUX 2:1" ], "settings": { "snapping": true, "straightWires": false, "grid": true, "simulationPaused": true, "stepsPerSecond": 8, "stepsPerClock": 8 }, "inputValues": { "input-d0": 1, "input-d1": 0, "input-select": 0 }, "keyValues": { "KeyZ": false, "z": false, "ControlLeft": true, "Control": true, "KeyS": true, "s": true } }