adafruit-circuitpython-ds1841 1.0.2

Introduction

CircuitPython library for the Maxim DS1841 I2C Logarithmic Resistor

Dependencies

This driver depends on:

• Adafruit CircuitPython

• Bus Device

• Register

Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle.

Installing from PyPI

On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI. To install for current user:

pip3 install adafruit-circuitpython-ds1841

To install system-wide (this may be required in some cases):

sudo pip3 install adafruit-circuitpython-ds1841

To install in a virtual environment in your current project:

mkdir project-name && cd project-name
python3 -m venv .env
source .env/bin/activate
pip3 install adafruit-circuitpython-ds1841

Usage Example

from time import sleep
import board
import busio
import adafruit_ds1841
from analogio import AnalogIn

####### NOTE ################
# this example will not work with Blinka/rasberry Pi due to the lack of analog pins.
# Blinka and Raspberry Pi users should run the "ds1841_blinka_simpletest.py" example

# WIRING:
# 1 Wire connecting  VCC to RH to make a voltage divider using the
#   internal resistor between RH and RW
# 2 Wire connecting RW to A0

i2c = busio.I2C(board.SCL, board.SDA)
ds1841 = adafruit_ds1841.DS1841(i2c)
wiper_output = AnalogIn(board.A0)

while True:

    ds1841.wiper = 127
    print("Wiper set to %d"%ds1841.wiper)
    voltage = wiper_output.value
    voltage *= 3.3
    voltage /= 65535
    print("Wiper voltage: %.2f"%voltage)
    print("")
    sleep(1.0)

    ds1841.wiper = 0
    print("Wiper set to %d"%ds1841.wiper)
    voltage = wiper_output.value
    voltage *= 3.3
    voltage /= 65535
    print("Wiper voltage: %.2f"%voltage)
    print("")
    sleep(1.0)

    ds1841.wiper = 63
    print("Wiper set to %d"%ds1841.wiper)
    voltage = wiper_output.value
    voltage *= 3.3
    voltage /= 65535
    print("Wiper voltage: %.2f"%voltage)
    print("")
    sleep(1.0)

Contributing

Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.

Documentation

For information on building library documentation, please check out this guide.