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

1. gator:bit Compatible
2. 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
3. Electret Microphone
   • Operating Voltage: 1.5V (Max 10V)
   • Supply Current: 0.3mA (Max)
   • Directivity: Omnidirectional
   • Frequency Response: 20-16,000Hz
4. LMV324 Op-amp
• Operating Voltage: 2.7V-5.5V
• Supply Current: ~300-720µA

REFERENCES

1. Schematic
2. Eagle Files
3. Hookup Guide
4. Datasheet (Electret Microphone)
5. Datasheet (LVM324)
6. Datasheet (ADS1015)
7. gator:microphone PXT Package
8. micro:bit Information Page
9. GitHub Hardware Repo