### Install MCP3421 Driver via PyPI

Source: https://github.com/adafruit/adafruit_circuitpython_mcp3421/blob/main/docs/index.md

Install the driver locally on supported GNU/Linux systems using pip3.

```shell
pip3 install adafruit-circuitpython-mcp3421
```

--------------------------------

### Install Circup

Source: https://github.com/adafruit/adafruit_circuitpython_mcp3421/blob/main/docs/index.md

Install the circup tool, which is used to manage CircuitPython libraries on connected devices.

```shell
pip3 install circup
```

--------------------------------

### Install MCP3421 Driver System-Wide via PyPI

Source: https://github.com/adafruit/adafruit_circuitpython_mcp3421/blob/main/docs/index.md

Install the driver system-wide using pip3. This may be required in some cases.

```shell
sudo pip3 install adafruit-circuitpython-mcp3421
```

--------------------------------

### Install MCP3421 Driver in a Virtual Environment

Source: https://github.com/adafruit/adafruit_circuitpython_mcp3421/blob/main/README.rst

Set up a project directory, create a virtual environment, activate it, and then install the adafruit-circuitpython-mcp3421 library using pip3.

```shell
mkdir project-name && cd project-name
python3 -m venv .venv
source .venv/bin/activate
pip3 install adafruit-circuitpython-mcp3421
```

--------------------------------

### Install MCP3421 Driver in a Virtual Environment via PyPI

Source: https://github.com/adafruit/adafruit_circuitpython_mcp3421/blob/main/docs/index.md

Install the driver within a virtual environment for a specific project using pip3.

```shell
mkdir project-name && cd project-name
python3 -m venv .venv
source .env/bin/activate
pip3 install adafruit-circuitpython-mcp3421
```

--------------------------------

### Install MCP3421 Driver using Circup

Source: https://github.com/adafruit/adafruit_circuitpython_mcp3421/blob/main/docs/index.md

Install the adafruit_mcp3421 library onto a connected CircuitPython device using circup.

```shell
circup install adafruit_mcp3421
```

--------------------------------

### Read Analog Input from MCP3421 ADC

Source: https://github.com/adafruit/adafruit_circuitpython_mcp3421/blob/main/docs/index.md

This example demonstrates how to initialize the MCP3421 ADC and read analog input values continuously. It requires the `adafruit_mcp3421` library and `board` and `time` modules.

```python
import time
import board
import adafruit_mcp3421.mcp3421 as ADC
from adafruit_mcp3421.analog_in import AnalogIn

i2c = board.I2C()

adc = ADC.MCP3421(i2c)
adc_channel = AnalogIn(adc)

while True:
    print((adc_channel.value,))
    time.sleep(0.01)
```

--------------------------------

### Update MCP3421 Driver using Circup

Source: https://github.com/adafruit/adafruit_circuitpython_mcp3421/blob/main/docs/index.md

Update an existing installation of the adafruit_mcp3421 library on a CircuitPython device using circup.

```shell
circup update
```

--------------------------------

### Simple MCP3421 ADC Test

Source: https://github.com/adafruit/adafruit_circuitpython_mcp3421/blob/main/docs/examples.md

This snippet initializes the MCP3421 ADC with specific gain, resolution, and continuous mode settings. It then enters a loop to continuously print the ADC value, current gain, resolution, and operating mode. This is useful for basic testing and monitoring.

```python
# SPDX-FileCopyrightText: Copyright (c) 2024 Liz Clark for Adafruit Industries
#
# SPDX-License-Identifier: MIT

import time

import board

import adafruit_mcp3421.mcp3421 as ADC
from adafruit_mcp3421.analog_in import AnalogIn

i2c = board.I2C()

adc = ADC.MCP3421(i2c, gain=1, resolution=14, continuous_mode=True)
adc_channel = AnalogIn(adc)
# gain, resolution and mode can also be set after instantiation:

# set gain to 1, 2, 4 or 8x
# defaults to 1
# adc.gain = 1

# set resolution to 12, 14, 16 or 18
# defaults to 14
# adc.resolution = 14

# set continuous read mode True or False for one-shot
# defaults to True
# adc.continuous_mode = True

while True:
    print(f"ADC value: {adc_channel.value}")
    print(f"Current gain: {adc.gain}X")
    print(f"Current resolution: {adc.resolution}-bit")
    if adc.continuous_mode:
        mode = "continuous"
    else:
        mode = "one-shot"
    print(f"Mode: {mode}")
    print()
    time.sleep(0.01)
```

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