MCP2221

README.md

MCP2221

• MCP2221
  • Infos
  • I2C Setup
    • Test
  • CircuitPython Libraries on any Computer with MCP2221
    • Setup
      • Test setup
  • SparkFun CCS811/BME280 Combo Board
    • BME280
    • CCS811
  • Grove - I2C ADC
    • Links
  • Tips & Tricks

Infos

• https://www.microchip.com/en-us/product/MCP2221
• https://elinux.org/Interfacing_with_I2C_Devices
• https://www.kernel.org/doc/Documentation/i2c/dev-interface
• https://github.com/nonNoise/PyMCP2221A

I2C Setup

Source:

• https://gist.github.com/mamemomonga/fdb7a2330b0a3c5d2ba50528c5946ef4
• https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/SoftwareLibraries/Firmware/MCP2200_MCP2221_CDC_Linux_Readme.txt

wget http://ww1.microchip.com/downloads/en/DeviceDoc/mcp2221_0_1.tar.gz
tar zxvf mcp2221_0_1.tar.gz
cd mcp2221_0_1
sudo make modules
sudo make install

sudo ./driver_load.sh

Test

apt install i2c-tools
sudo i2cdetect -l

i2c-3   i2c             i2c-mcp2221 at bus 001 device 006       I2C adapter

sudo i2cdetect -y 3

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

CircuitPython Libraries on any Computer with MCP2221

Setup

python3 -m venv venv
source venv/bin/activate
pip3 install bpython

Source: https://learn.adafruit.com/circuitpython-libraries-on-any-computer-with-mcp2221/linux

pip3 install hidapi
pip3 install adafruit-blinka

export BLINKA_MCP2221=1

Test setup

import board
dir(board)

SparkFun CCS811/BME280 Combo Board

Source:

• https://github.com/sparkfun/Qwiic_BME280_CCS811_Combo
• https://learn.adafruit.com/adafruit-bme280-humidity-barometric-pressure-temperature-sensor-breakout/python-circuitpython-test

sudo i2cdetect -l
i2c-3 i2c        AMDGPU DM i2c hw bus 0           I2C adapter
i2c-10 i2c        i2c-mcp2221 at bus 001 device 014 I2C adapter
i2c-1 i2c        Synopsys DesignWare I2C adapter  I2C adapter
i2c-8 i2c        AMDGPU DM aux hw bus 2           I2C adapter
i2c-6 i2c        AMDGPU DM i2c hw bus 3           I2C adapter
i2c-4 i2c        AMDGPU DM i2c hw bus 1           I2C adapter
i2c-2 i2c        Synopsys DesignWare I2C adapter  I2C adapter
i2c-0 i2c        Synopsys DesignWare I2C adapter  I2C adapter
i2c-9 i2c        AMDGPU DM aux hw bus 3           I2C adapter
i2c-7 i2c        AMDGPU DM aux hw bus 0           I2C adapter
i2c-5 i2c        AMDGPU DM i2c hw bus 2           I2C adapter

sudo i2cdetect -y 10

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:                         -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- 5b -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- 77 

BME280

pip3 install adafruit-circuitpython-bme280

export BLINKA_MCP2221=1

import board
from adafruit_bme280 import basic as adafruit_bme280
i2c = board.I2C()  # uses board.SCL and board.SDA
bme280 = adafruit_bme280.Adafruit_BME280_I2C(i2c)
print("\nTemperature: %0.1f C" % bme280.temperature)
print("Humidity: %0.1f %%" % bme280.humidity)
print("Pressure: %0.1f hPa" % bme280.pressure)

CCS811

pip3 install adafruit-circuitpython-ccs811

export BLINKA_MCP2221=1

# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT

import time
import board
import adafruit_ccs811

i2c = board.I2C()  # uses board.SCL and board.SDA
ccs811 = adafruit_ccs811.CCS811(i2c, address=0x5B)

# Wait for the sensor to be ready
while not ccs811.data_ready:
    pass

while True:
    print("CO2: {} PPM, TVOC: {} PPB".format(ccs811.eco2, ccs811.tvoc))
    time.sleep(0.5)

Grove - I2C ADC

Grove - I2C ADC is a 12-bit precision ADC module based on ADC121C021.

Links

• https://wiki.seeedstudio.com/Grove-I2C_ADC/
• https://github.com/ControlEverythingCommunity/ADC121C021
• http://blog.rareschool.com/search/label/ADC

I2C adress is 0x50.

i2cdetect -y 10
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:                         -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: 50 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --    

# set mode 
i2cset -y 10 0x50 0x02 0x20
watch -n1 i2cget -y 10 0x50 0

Tips & Tricks

Use bpython as lightweight Python interpreter:

• https://github.com/bpython/bpython