Sam MugfordBen DewhurstLawrence Percival-Alwyn
Published © GPL3+

Homebrew Fermentation Monitor

We aim to develop a tool to monitor the progress of beer fermentation in real-time and non-invasively.

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Homebrew Fermentation Monitor

Things used in this project

Hardware components

Analog hall effect sensor
×1
Rich UNO R3 Arduino
×1
Standard LCD - 16x2 White on Blue
Adafruit Standard LCD - 16x2 White on Blue
×1
Ultrasonic Sensor - HC-SR04 (Generic)
Ultrasonic Sensor - HC-SR04 (Generic)
×1
IO expansion shield
×1

Hand tools and fabrication machines

Neodymium Magnets
Hydrometer

Story

Read more

Schematics

Acoustic sensor circuit

Acoustic sensor to detect the height of a hydrometer and report the specific gravity of the fluid via LCD display
Acoustic sensor circuit c1dvwgsrjh

Magnetic sensory circuit

Hall-effect detector to detect the height of a hydrometer and report the % alcohol in the fluid via LCD display
Magnetic sensor circuit j2uguufyw8

Magnetic hydrometer assembly

Five 5x5x1mm Neodymium magnets super-glued to the end of a bamboo kebab skewer. The south pole of the magnet is indicated by the black spot on the stick.
Magnet l4iidjaopf

Magnetic hydrometer assembly pt.2

Neodymium magnets mounted on bamboo skewer attached to hydromter as shown. The external aparatus to be mounted on the lid of the fermenter consists of a c~20cm legnth of 8mm internal diameter plasti tubing fitted onto a rubber seal from a fermenter airlock, and attached to a bamboo skewer to hold it upright.
Magnet equipment 1u4bwmldsv

Magnetic hydrometer assembly pt.3

External apparatus mounted on fermenter lid, rubber seal placed in 1.5 cm hole in lid. Neodymium magnet-hydrometer assembly inserted with magnet inside the tube. The lid should then be placed on the fermenter so that the hydrometer floats freely. All components coming into contact with the inside of the fermenter should be carefuly steralised first.
Magnetic assembly 1 l9kjahxcpo

Magnetic hydrometer assembly pt.4

Hall-effect sensor mounted on the external apparatus. The sensor should be possitioned adjacent (here we used sticky-tape) to the south pole of the neodymium magnet at the start of the fermentation. As fermentation proceeds the magnet will move down, and the unit will record the change in alcohol content.
Magnetic assembly 2 lsqgcc9h9c

Code

Acoustic hydrometer code

C/C++
XOD code for automatic hydrometer using an acoustic sensor to monitor the height of a hydrometer in fluid, and report the specific gravity of the fluid via the LCD display.
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Magnetic hydrometer code

C/C++
XOD code for an automated hydrometer using a hall-effect sensor to measure the height of a hydromter in a fluid, and to report the alcohol concentration via the LCD display
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          "id": "rJP8fS74V",
          "input": {
            "nodeId": "SywSfBmEN",
            "pinKey": "B1GfLR_SPk-"
          },
          "output": {
            "nodeId": "S1-5eBQ44",
            "pinKey": "BkQzLCurwJZ"
          }
        },
        "rJhrKRK7V": {
          "id": "rJhrKRK7V",
          "input": {
            "nodeId": "H1FSYAFXN",
            "pinKey": "ByZ7_hnUb"
          },
          "output": {
            "nodeId": "SywNKAY74",
            "pinKey": "BkqLCOSw1W"
          }
        },
        "rygjlBmVN": {
          "id": "rygjlBmVN",
          "input": {
            "nodeId": "S1-5eBQ44",
            "pinKey": "B1GfLR_SPk-"
          },
          "output": {
            "nodeId": "H1FSYAFXN",
            "pinKey": "B1QQ_nhUb"
          }
        }
      },
      "nodes": {
        "BJcAiB2F7E": {
          "boundLiterals": {
            "B1TSE9tZ-": "\"Alcohol %\"",
            "SkkWMb9A-": "True",
            "rJlYT7EfW": "56d"
          },
          "id": "BJcAiB2F7E",
          "position": {
            "x": 306,
            "y": 612
          },
          "type": "xod/common-hardware/text-lcd-16x2-i2c"
        },
        "BkIcdAKmV": {
          "boundLiterals": {
            "rkJ4URuHDJ-": "456.86"
          },
          "id": "BkIcdAKmV",
          "position": {
            "x": 272,
            "y": 204
          },
          "type": "xod/core/subtract"
        },
        "BkkqY3YmE": {
          "boundLiterals": {
            "SJ4zUC_BD1-": "1000"
          },
          "id": "BkkqY3YmE",
          "position": {
            "x": 306,
            "y": 102
          },
          "type": "xod/core/multiply"
        },
        "ByI0iHntXE": {
          "id": "ByI0iHntXE",
          "position": {
            "x": 102,
            "y": 102
          },
          "size": {
            "height": 51,
            "width": 68
          },
          "type": "xod/core/watch"
        },
        "H1FSYAFXN": {
          "id": "H1FSYAFXN",
          "position": {
            "x": 374,
            "y": 306
          },
          "type": "xod/math/sqrt"
        },
        "HJ8XyB74V": {
          "id": "HJ8XyB74V",
          "position": {
            "x": 68,
            "y": 204
          },
          "size": {
            "height": 51,
            "width": 68
          },
          "type": "xod/core/watch"
        },
        "S1-5eBQ44": {
          "boundLiterals": {
            "SJ4zUC_BD1-": "0.001887925"
          },
          "id": "S1-5eBQ44",
          "position": {
            "x": 306,
            "y": 408
          },
          "type": "xod/core/multiply"
        },
        "SJjIKRtXN": {
          "id": "SJjIKRtXN",
          "position": {
            "x": 476,
            "y": 612
          },
          "size": {
            "height": 51,
            "width": 68
          },
          "type": "xod/core/watch"
        },
        "SkHnB3K74": {
          "id": "SkHnB3K74",
          "position": {
            "x": 136,
            "y": 0
          },
          "type": "@/hall-sensor"
        },
        "SywNKAY74": {
          "boundLiterals": {
            "SkdIRuBD1b": "1"
          },
          "id": "SywNKAY74",
          "position": {
            "x": 306,
            "y": 306
          },
          "type": "xod/core/divide"
        },
        "SywSfBmEN": {
          "boundLiterals": {
            "SJ4zUC_BD1-": "131.25"
          },
          "id": "SywSfBmEN",
          "position": {
            "x": 272,
            "y": 510
          },
          "type": "xod/core/multiply"
        },
        "r1jFqNmEE": {
          "boundLiterals": {
            "BytUCdHD1-": "2909.5"
          },
          "id": "r1jFqNmEE",
          "position": {
            "x": 340,
            "y": 204
          },
          "type": "xod/core/divide"
        }
      },
      "path": "@/main"
    }
  }
}

New XOD Patches

C/C++
New XOD Patches, including node to control Sunfounder analog hall-switch, node to control light sensor, and a node to take a noisy input signal and smooth the signal using a rolling average
{
  "name": "",
  "patches": {
    "@/hall-sensor": {
      "links": {
        "BkFquSixQE": {
          "id": "BkFquSixQE",
          "input": {
            "nodeId": "r1xqurjxXV",
            "pinKey": "__in__"
          },
          "output": {
            "nodeId": "BkVcuHogQV",
            "pinKey": "H1P1711gm"
          }
        },
        "BkHquBslXE": {
          "id": "BkHquBslXE",
          "input": {
            "nodeId": "BkVcuHogQV",
            "pinKey": "r1l3XcR17"
          },
          "output": {
            "nodeId": "rJZcurol7V",
            "pinKey": "__out__"
          }
        },
        "ByUUKril7E": {
          "id": "ByUUKril7E",
          "input": {
            "nodeId": "B1E8FrsgQE",
            "pinKey": "B143qAq1Q"
          },
          "output": {
            "nodeId": "BkXUYSigX4",
            "pinKey": "__out__"
          }
        },
        "H1d5drjlQ4": {
          "id": "H1d5drjlQ4",
          "input": {
            "nodeId": "BkVcuHogQV",
            "pinKey": "SkUhQ5RkQ"
          },
          "output": {
            "nodeId": "rJcdHil7E",
            "pinKey": "__out__"
          }
        },
        "HJDIYBogm4": {
          "id": "HJDIYBogm4",
          "input": {
            "nodeId": "ByZIFHsxm4",
            "pinKey": "__in__"
          },
          "output": {
            "nodeId": "B1E8FrsgQE",
            "pinKey": "B1gI0urv1W"
          }
        },
        "SJYqBsxQ4": {
          "id": "SJYqBsxQ4",
          "input": {
            "nodeId": "B1E8FrsgQE",
            "pinKey": "SyLCdSwJZ"
          },
          "output": {
            "nodeId": "rJcdHil7E",
            "pinKey": "__out__"
          }
        },
        "SkLqOSjgX4": {
          "id": "SkLqOSjgX4",
          "input": {
            "nodeId": "rJm5urogQE",
            "pinKey": "__in__"
          },
          "output": {
            "nodeId": "BkVcuHogQV",
            "pinKey": "BkoeN9Ay7"
          }
        },
        "SkORHjlXN": {
          "id": "SkORHjlXN",
          "input": {
            "nodeId": "SkG9dBjgX4",
            "pinKey": "__in__"
          },
          "output": {
            "nodeId": "BkVcuHogQV",
            "pinKey": "BJdJV9RkX"
          }
        }
      },
      "nodes": {
        "B1E8FrsgQE": {
          "id": "B1E8FrsgQE",
          "position": {
            "x": 340,
            "y": 204
          },
          "type": "xod/gpio/digital-read"
        },
        "BkVcuHogQV": {
          "id": "BkVcuHogQV",
          "position": {
            "x": 102,
            "y": 204
          },
          "type": "xod/common-hardware/analog-sensor"
        },
        "BkXUYSigX4": {
          "boundLiterals": {
            "__out__": "D3"
          },
          "id": "BkXUYSigX4",
          "position": {
            "x": 340,
            "y": 102
          },
          "type": "xod/patch-nodes/input-port"
        },
        "ByZIFHsxm4": {
          "description": "Last read value. Equals to `true` while the button is pressed (hold down) and `false` while it is released.",
          "id": "ByZIFHsxm4",
          "label": "PRS",
          "position": {
            "x": 340,
            "y": 306
          },
          "type": "xod/patch-nodes/output-boolean"
        },
        "SkG9dBjgX4": {
          "description": "Fires on reading complete",
          "id": "SkG9dBjgX4",
          "label": "DONE",
          "position": {
            "x": 170,
            "y": 306
          },
          "type": "xod/patch-nodes/output-pulse"
        },
        "r1xqurjxXV": {
          "description": "Fires if update failed.",
          "id": "r1xqurjxXV",
          "label": "ERR",
          "position": {
            "x": 238,
            "y": 306
          },
          "type": "xod/patch-nodes/output-pulse"
        },
        "rJZcurol7V": {
          "boundLiterals": {
            "__out__": "A0"
          },
          "id": "rJZcurol7V",
          "position": {
            "x": 102,
            "y": 102
          },
          "type": "xod/patch-nodes/input-port"
        },
        "rJcdHil7E": {
          "boundLiterals": {
            "__out__": "Continuously"
          },
          "description": "Triggers new read",
          "id": "rJcdHil7E",
          "label": "UPD",
          "position": {
            "x": 170,
            "y": 102
          },
          "type": "xod/patch-nodes/input-pulse"
        },
        "rJm5urogQE": {
          "description": "The last read potentiometer position in range [0.0, 1.0].",
          "id": "rJm5urogQE",
          "label": "VAL",
          "position": {
            "x": 102,
            "y": 306
          },
          "type": "xod/patch-nodes/output-number"
        }
      },
      "path": "@/hall-sensor"
    },
    "@/light-sensor": {
      "links": {
        "B1YxneufV": {
          "id": "B1YxneufV",
          "input": {
            "nodeId": "ryhColuME",
            "pinKey": "r1l3XcR17"
          },
          "output": {
            "nodeId": "S1GghguMV",
            "pinKey": "__out__"
          }
        },
        "H1zzhldGN": {
          "id": "H1zzhldGN",
          "input": {
            "nodeId": "rJpb2x_fN",
            "pinKey": "__in__"
          },
          "output": {
            "nodeId": "ryhColuME",
            "pinKey": "BkoeN9Ay7"
          }
        },
        "HJ7V2xufN": {
          "id": "HJ7V2xufN",
          "input": {
            "nodeId": "rJAX3edfV",
            "pinKey": "__in__"
          },
          "output": {
            "nodeId": "ryhColuME",
            "pinKey": "BJdJV9RkX"
          }
        },
        "HkxXnedMN": {
          "id": "HkxXnedMN",
          "input": {
            "nodeId": "ryhColuME",
            "pinKey": "SkUhQ5RkQ"
          },
          "output": {
            "nodeId": "Bkcfhedz4",
            "pinKey": "__out__"
          }
        },
        "HyxB3guG4": {
          "id": "HyxB3guG4",
          "input": {
            "nodeId": "ByiV2g_G4",
            "pinKey": "__in__"
          },
          "output": {
            "nodeId": "ryhColuME",
            "pinKey": "H1P1711gm"
          }
        }
      },
      "nodes": {
        "Bkcfhedz4": {
          "boundLiterals": {
            "__out__": "Continuously"
          },
          "description": "Triggers new read",
          "id": "Bkcfhedz4",
          "label": "UPD",
          "position": {
            "x": 272,
            "y": 0
          },
          "type": "xod/patch-nodes/input-pulse"
        },
        "ByiV2g_G4": {
          "description": "Fires if update failed.",
          "id": "ByiV2g_G4",
          "label": "ERR",
          "position": {
            "x": 340,
            "y": 204
          },
          "type": "xod/patch-nodes/output-pulse"
        },
        "S1GghguMV": {
          "boundLiterals": {
            "__out__": "A0"
          },
          "id": "S1GghguMV",
          "position": {
            "x": 204,
            "y": 0
          },
          "type": "xod/patch-nodes/input-port"
        },
        "rJAX3edfV": {
          "description": "Fires on reading complete",
          "id": "rJAX3edfV",
          "label": "DONE",
          "position": {
            "x": 272,
            "y": 204
          },
          "type": "xod/patch-nodes/output-pulse"
        },
        "rJpb2x_fN": {
          "description": "The last read potentiometer position in range [0.0, 1.0].",
          "id": "rJpb2x_fN",
          "label": "VAL",
          "position": {
            "x": 204,
            "y": 204
          },
          "type": "xod/patch-nodes/output-number"
        },
        "ryhColuME": {
          "id": "ryhColuME",
          "position": {
            "x": 204,
            "y": 102
          },
          "type": "xod/common-hardware/analog-sensor"
        }
      },
      "path": "@/light-sensor"
    },
    "@/main": {
      "path": "@/main"
    },
    "@/rolling-average": {
      "comments": {
        "BJqWrxAPcGN": {
          "content": "Takes a fluctuating numerical input and calculates a rolling average from 4 sequential reading taken one per second. The rolling average is output as a numerical value. \n\nTo adjust the frequency of sampling change the IVAL in the clock patch",
          "id": "BJqWrxAPcGN",
          "position": {
            "x": 603.7499995231628,
            "y": 101
          },
          "size": {
            "height": 153,
            "width": 238
          }
        }
      },
      "links": {
        "B1LgHgAvcGE": {
          "id": "B1LgHgAvcGE",
          "input": {
            "nodeId": "BkIBx0wqME",
            "pinKey": "HkXm80uHPyb"
          },
          "output": {
            "nodeId": "rynHlAD9zV",
            "pinKey": "HyZHD8tcW"
          }
        },
        "B1pxSxRDqGN": {
          "id": "B1pxSxRDqGN",
          "input": {
            "nodeId": "H1mSxRP9zE",
            "pinKey": "HkqmLAOrD1W-$3"
          },
          "output": {
            "nodeId": "SyylBgRw5fV",
            "pinKey": "HyZHD8tcW"
          }
        },
        "BkAxrgADcGE": {
          "id": "BkAxrgADcGE",
          "input": {
            "nodeId": "H1wSg0D5MV",
            "pinKey": "__in__"
          },
          "output": {
            "nodeId": "rkeBlCw9fN",
            "pinKey": "BkqLCOSw1W"
          }
        },
        "BkOxBxCw5fV": {
          "id": "BkOxBxCw5fV",
          "input": {
            "nodeId": "rJ9rl0vqMV",
            "pinKey": "HkXK-dGob"
          },
          "output": {
            "nodeId": "rynHlAD9zV",
            "pinKey": "HyZHD8tcW"
          }
        },
        "BybZBeRv5zV": {
          "id": "BybZBeRv5zV",
          "input": {
            "nodeId": "SyylBgRw5fV",
            "pinKey": "B15NPUY9W"
          },
          "output": {
            "nodeId": "ryBBlRw5zV",
            "pinKey": "r1lQLAOBwJb"
          }
        },
        "H1GgHgRvqME": {
          "id": "H1GgHgRvqME",
          "input": {
            "nodeId": "H1mSxRP9zE",
            "pinKey": "HkqmLAOrD1W-$2"
          },
          "output": {
            "nodeId": "rJTSlADqf4",
            "pinKey": "HyZHD8tcW"
          }
        },
        "H1S-HeCvcGV": {
          "id": "H1S-HeCvcGV",
          "input": {
            "nodeId": "Hy0BlCDqME",
            "pinKey": "Hy-QUR_BPkZ"
          },
          "output": {
            "nodeId": "S1sBe0v5fN",
            "pinKey": "HJU8CE2lW"
          }
        },
        "HJEWHgRPczE": {
          "id": "HJEWHgRPczE",
          "input": {
            "nodeId": "BkIBx0wqME",
            "pinKey": "Hy-QUR_BPkZ"
          },
          "output": {
            "nodeId": "S1sBe0v5fN",
            "pinKey": "HJU8CE2lW"
          }
        },
        "Hy7grx0v9M4": {
          "id": "Hy7grx0v9M4",
          "input": {
            "nodeId": "H1GreCvcME",
            "pinKey": "HkXK-dGob"
          },
          "output": {
            "nodeId": "rJTSlADqf4",
            "pinKey": "HyZHD8tcW"
          }
        },
        "HyDeBeCvczE": {
          "id": "HyDeBeCvczE",
          "input": {
            "nodeId": "By_Sx0wcME",
            "pinKey": "HkXK-dGob"
          },
          "output": {
            "nodeId": "H1breRvcfN",
            "pinKey": "HyZHD8tcW"
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        },
        "HyVlHlCw9M4": {
          "id": "HyVlHlCw9M4",
          "input": {
            "nodeId": "rynHlAD9zV",
            "pinKey": "B15NPUY9W"
          },
          "output": {
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            "pinKey": "r1lQLAOBwJb"
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        },
        "HygWBgRv5GV": {
          "id": "HygWBgRv5GV",
          "input": {
            "nodeId": "rJTSlADqf4",
            "pinKey": "B15NPUY9W"
          },
          "output": {
            "nodeId": "Hy0BlCDqME",
            "pinKey": "r1lQLAOBwJb"
          }
        },
        "HyuZrx0v9MN": {
          "id": "HyuZrx0v9MN",
          "input": {
            "nodeId": "HJKBgCw5zE",
            "pinKey": "HkXm80uHPyb"
          },
          "output": {
            "nodeId": "BkxxBxRw9GN",
            "pinKey": "__out__"
          }
        },
        "S1sgSe0w9zN": {
          "id": "S1sgSe0w9zN",
          "input": {
            "nodeId": "H1mSxRP9zE",
            "pinKey": "HkqmLAOrD1W-$1"
          },
          "output": {
            "nodeId": "H1breRvcfN",
            "pinKey": "HyZHD8tcW"
          }
        },
        "SJDZre0DqME": {
          "id": "SJDZre0DqME",
          "input": {
            "nodeId": "H1-lBxCD5M4",
            "pinKey": "HkXK-dGob"
          },
          "output": {
            "nodeId": "rkeBlCw9fN",
            "pinKey": "BkqLCOSw1W"
          }
        },
        "SJGZHxRvqzE": {
          "id": "SJGZHxRvqzE",
          "input": {
            "nodeId": "HyNHgCD5zV",
            "pinKey": "HkXK-dGob"
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          "output": {
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            "pinKey": "HyZHD8tcW"
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        },
        "SkFZBeCw9fV": {
          "id": "SkFZBeCw9fV",
          "input": {
            "nodeId": "rkSeRD5f4",
            "pinKey": "HkXK-dGob"
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          "output": {
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            "pinKey": "__out__"
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        },
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            "pinKey": "HkXm80uHPyb"
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          "output": {
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            "pinKey": "HyZHD8tcW"
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        },
        "SyFlBlRD5f4": {
          "id": "SyFlBlRD5f4",
          "input": {
            "nodeId": "Hy0BlCDqME",
            "pinKey": "HkXm80uHPyb"
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            "pinKey": "Hy-QUR_BPkZ"
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            "pinKey": "HkqmLAOrD1W"
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          "output": {
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            "pinKey": "HyZHD8tcW"
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        },
        "rkJ-HlCP9MV": {
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          "input": {
            "nodeId": "H1breRvcfN",
            "pinKey": "B15NPUY9W"
          },
          "output": {
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            "pinKey": "r1lQLAOBwJb"
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        },
        "rkngBlAw9zV": {
          "id": "rkngBlAw9zV",
          "input": {
            "nodeId": "rkeBlCw9fN",
            "pinKey": "SkdIRuBD1b"
          },
          "output": {
            "nodeId": "H1mSxRP9zE",
            "pinKey": "SyomIRurDJ-"
          }
        }
      },
      "nodes": {
        "BkIBx0wqME": {
          "id": "BkIBx0wqME",
          "position": {
            "x": 203,
            "y": 101
          },
          "type": "xod/core/buffer"
        },
        "BkxxBxRw9GN": {
          "id": "BkxxBxRw9GN",
          "position": {
            "x": -43.25000047683716,
            "y": -2
          },
          "type": "xod/patch-nodes/input-number"
        },
        "By_Sx0wcME": {
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}

Credits

Sam Mugford

Sam Mugford

1 project • 2 followers
Ben Dewhurst

Ben Dewhurst

1 project • 2 followers
Lawrence Percival-Alwyn

Lawrence Percival-Alwyn

1 project • 2 followers

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