docs: Improve microphone description, add more info for `set_threshol… #204

	name: Build MicroPython

	on:
	push:
	branches: '*'
	pull_request:
	branches: '*'

	jobs:
	build:
	runs-on: ubuntu-20.04
	name: Build MicroPython
	steps:
	- uses: actions/checkout@v2
	# Yotta has some issues with Python 3.7+
	- name: Install Python 3.6
	uses: actions/setup-python@v3
	with:
	python-version: 3.6
	- name: Install GNU Arm Embedded Toolchain (arm-none-eabi-gcc)
	uses: carlosperate/arm-none-eabi-gcc-action@v1
	with:
	release: "10.3-2021.10"
	- name: Install CMake, Ninja & Yotta
	run: pip install cmake==3.22.3 ninja==1.10.2.3 yotta==0.20.5
	- name: Install srecord
	run: sudo apt-get install -y srecord
	- name: Check Versions
	run: \|
	arm-none-eabi-gcc --version
	cmake --version
	ninja --version
	python --version
	yotta --version
	- name: Set up the Yotta target from GitHub
	run: \|
	yotta target bbc-microbit-classic-gcc-nosd@https://github.com/lancaster-university/yotta-target-bbc-microbit-classic-gcc-nosd
	yotta up
	- run: make qstrs
	- run: git diff
	- run: make all
	- name: Process date for artifact filename
	id: date
	run: echo "::set-output name=date::$(date +'%Y-%m-%d')"
	- name: Upload hex file
	uses: actions/upload-artifact@v1
	with:
	name: microbitv1-micropython-${{ steps.date.outputs.date }}-${{ github.sha }}.hex
	path: build/firmware.hex

Provide feedback