Micro:Bit V2 Overview - Microphone

Summary of technological concepts & product features (Micro:bit V2 – microphone focus)

Micro:bit V2 release context

• The Micro:bit Foundation announced Micro:bit version 2, expected to be released next month / in November (about five years after the original release).

Key V2 hardware upgrades for everyday projects

Primary focus: built-in microphone. Other notable upgrades include:

• Built-in microphone
• Built-in piezo speaker
• Capacitive touch capability on multiple pins/points
• Mentioned (not the main demo): light sensor/LED usage, and accelerometer (shake detection)
• Bluetooth upgrade: Bluetooth 4.0 → Bluetooth 5.0, framed as better availability and modern capability

Software environment limitations noted

• MakeCode support for Micro:bit V2 features was described as still limited, with updates actively in progress.
• Universal binary behavior was highlighted:
  • Many MakeCode projects work on both V1.5 and V2
  • Caveat: mic/piezo/touch features only function if the hardware supports them

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Demos / project ideas shown (microphone-driven)

1) “Clapper” sound-trigger (simple threshold detection)

A sound-trigger demo that detects loud vs. soft sounds using a sound level threshold.

• When a clap crosses the threshold:
  • The LED matrix turns off briefly, then turns back on
• Implementation concept:
  • Based on MakeCode “basic example” style logic for loud sound / soft sound, with adjustable thresholds

2) “VU meter” (volume-reactive LED visualization)

A “VU meter” concept (explicitly volume units, not “UV”).

• Uses the microphone for real-time-ish volume indication
• Uses threshold ranges to light a corresponding number of LEDs
• Result: LEDs bounce up/down while speaking
• Clarification: this is not true frequency analysis—it’s volume-level thresholding

3) Microphone logo indicator behavior

• A small microphone logo near the mic lights up when the microphone is active
• Presented as a cute usability detail that makes it obvious the mic is working

4) DJ mini-fig LED beat illusion (fake/reactive animation)

A reference to a previously posted “DJ mini-fig” project:

• The LEDs looked beat-reactive due to random animation timing aligned with audio (but not necessarily measuring frequency/content)
• Suggested next step:
  • Use the V2 microphone so the character’s LEDs bounce more closely to real sound/music

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Classroom / practical use cases mentioned

• Sound-level meter for noisy classrooms

  • Teachers can set a threshold
  • When exceeded: the piezo speaker beeps and/or LEDs flash as a warning

• Alarm / presence detection examples

  • Sound triggers for simple alarm-style behavior (e.g., someone entering or making noise)
  • Ideas for combining with other inputs:
    • light sensor
    • accelerometer (shake)
    • capacitive touch
  • Framed as “security system”-style projects

• Kid-friendly cause/effect learning

  • Emphasized benefit: the built-in microphone can reduce the need for extra external hardware adapters in classrooms

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Hardware expansion & related ecosystem (Brown Dog Gadgets + BitBoard)

• Their BitBoard (LEGO-based adapter) is promoted to make Micro:bit mounting and access easier in LEGO-friendly builds.
• Notes:
  • The BitBoard ships mid-to-late November (potential import delays mentioned)
  • V2 boards may be included for backers at certain pledge levels (NDA prevented earlier public announcement)
• Physical orientation preference:
  • The BitBoard mounts Micro:bit vertically so the display remains visible and connections stay accessible for kid-friendly projects

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Known differences vs older Micro:bit + feature compatibility

• Touch differences

  • Older Micro:bit versions (1.5) had resistive touch
  • Micro:bit V2 adds capacitive touch
  • A described workaround/hack: using analog inputs to make older resistive touch behave more like capacitive touch (planned for a future stream)

• Compatibility expectation

  • Existing MakeCode projects generally run across versions
  • But mic/piezo/touch capabilities require V2

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Mentioned comparisons

• Framed Micro:bit V2 as:
  • A kid/classroom friendly cheaper option
  • Compared with more “beefier” boards such as Adafruit Clue (noted as having higher-end features)
• Emphasis: Micro:bit is sufficient for many educational scenarios.

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Main speakers / sources

• Josh — Brown Dog Gadgets (host; introduced the live stream and topics)
• Pete — Brown Dog Gadgets (coding/demos; built the microphone projects such as the clapper and VU meter)
• Micro:bit Foundation / Microsoft MakeCode — cited as sources for hardware announcement and software environment support