Introduction¶
CircuitPython library for the MCP3xxx series of analog-to-digital converters.
Currently supports:
Dependencies¶
This driver depends on:
Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle.
Usage Example¶
MCP3008 Single Ended¶
import busio
import digitalio
import board
import adafruit_mcp3xxx.mcp3008 as MCP
from adafruit_mcp3xxx.analog_in import AnalogIn
# create the spi bus
spi = busio.SPI(clock=board.SCK, MISO=board.MISO, MOSI=board.MOSI)
# create the cs (chip select)
cs = digitalio.DigitalInOut(board.D5)
# create the mcp object
mcp = MCP.MCP3008(spi, cs)
# create an analog input channel on pin 0
chan = AnalogIn(mcp, MCP.P0)
print('Raw ADC Value: ', chan.value)
print('ADC Voltage: ' + str(chan.voltage) + 'V')
MCP3008 Differential¶
import busio
import digitalio
import board
import adafruit_mcp3xxx.mcp3008 as MCP
from adafruit_mcp3xxx.analog_in import AnalogIn
# create the spi bus
spi = busio.SPI(clock=board.SCK, MISO=board.MISO, MOSI=board.MOSI)
# create the cs (chip select)
cs = digitalio.DigitalInOut(board.D5)
# create the mcp object
mcp = MCP.MCP3008(spi, cs)
# create a differential ADC channel between Pin 0 and Pin 1
chan = AnalogIn(mcp, MCP.P0, MCP.P1)
print('Differential ADC Value: ', chan.value)
print('Differential ADC Voltage: ' + str(chan.voltage) + 'V')
MCP3004 Single-Ended¶
import busio
import digitalio
import board
import adafruit_mcp3xxx.mcp3004 as MCP
from adafruit_mcp3xxx.analog_in import AnalogIn
# create the spi bus
spi = busio.SPI(clock=board.SCK, MISO=board.MISO, MOSI=board.MOSI)
# create the cs (chip select)
cs = digitalio.DigitalInOut(board.D5)
# create the mcp object
mcp = MCP.MCP3004(spi, cs)
# create an analog input channel on pin 0
chan = AnalogIn(mcp, MCP.P0)
print('Raw ADC Value: ', chan.value)
print('ADC Voltage: ' + str(chan.voltage) + 'V')
MCP3004 Differential¶
import busio
import digitalio
import board
import adafruit_mcp3xxx.mcp3004 as MCP
from adafruit_mcp3xxx.analog_in import AnalogIn
# create the spi bus
spi = busio.SPI(clock=board.SCK, MISO=board.MISO, MOSI=board.MOSI)
# create the cs (chip select)
cs = digitalio.DigitalInOut(board.D5)
# create the mcp object
mcp = MCP.MCP3004(spi, cs)
# create a differential ADC channel between Pin 0 and Pin 1
chan = AnalogIn(mcp, MCP.P0, MCP.P1)
print('Differential ADC Value: ', chan.value)
print('Differential ADC Voltage: ' + str(chan.voltage) + 'V')
Contributing¶
Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.
Building locally¶
Zip release files¶
To build this library locally you’ll need to install the circuitpython-build-tools package.
python3 -m venv .env
source .env/bin/activate
pip install circuitpython-build-tools
Once installed, make sure you are in the virtual environment:
source .env/bin/activate
Then run the build:
circuitpython-build-bundles --filename_prefix adafruit-circuitpython-mcp3xxx --library_location .
Sphinx documentation¶
Sphinx is used to build the documentation based on rST files and comments in the code. First, install dependencies (feel free to reuse the virtual environment from above):
python3 -m venv .env
source .env/bin/activate
pip install Sphinx sphinx-rtd-theme
Now, once you have the virtual environment activated:
cd docs
sphinx-build -E -W -b html . _build/html
This will output the documentation to docs/_build/html
. Open the index.html in your browser to
view them. It will also (due to -W) error out on any warning like Travis will. This is a good way to
locally verify it will pass.