SparkFun gator:microphone - micro:bit Accessory Board

The SparkFun gator:microphone is a micro:bit Accessory Board that integrates an electret microphone into SparkFun's gator:bit series of gator-clippable accessories, enabling it to be easily interfaced with the micro:bit or other microcontrollers!

It provides a binary indication of the presence of sound and an analog representation of its amplitude.

The gator:microphone consists of four pads for power and data. There is also a switch on the board to select different audio amplification levels. Additionally, it includes an LMV324 operational amplifier (op-amp) for processing the audio signals from the microphone. The specified operating voltage for the VEML6070 is between 2.7V-5.5V. For use with the gator:bit (v2) and micro:bit, you should provide 3.3V through the 3V3 and GND pads to keep the logic levels consistent.

Features

• gator:bit Compatible
• ADS1015
  • Operating Voltage (V_DD): 2.0V-5.5V
  • Operating Temperature: -40°C to 125°C
  • Operation Modes: Single-Shot, Continuous-Conversion (Default), and Duty Cycling
  • Analog Inputs:
    • Measurement Type: Single-Ended (Default)
    • Input Voltage Range: GND to V_DD
    • Full Scale Range (FSR): ±.256V to ±6.114V (Default: 2.048V)
  • Resolution:
    • 12-bit (Differential) or 11-bit (Single-Ended)
    • LSB size: 0.125mV - 3mV (Default: 1 mV)
  • Sample Rate: 128 Hz to 3.3 kHz (Default: 1600SPS)
  • Current Consumption (Typical): 150μA-200μA
  • I²C Address: 0x48
• Electret Microphone
  • Operating Voltage: 1.5V (Max 10V)
  • Supply Current: 0.3mA (Max)
  • Directivity: Omnidirectional
  • Frequency Response: 20-16,000Hz
• LMV324 Op-amp
  • Operating Voltage: 2.7V-5.5V
  • Supply Current: ~300-720µA

Documents

• Schematic
• Eagle Files
• Hookup Guide
• Datasheet (Electret Microphone)
• Datasheet (LVM324)
• Datasheet (ADS1015)
• gator:microphone PXT Package
• GitHub Hardware Repo