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A python library for MCP3208

Project description

https://raw.githubusercontent.com/MomsFriendlyRobotCompany/MCP3208/master/docs/pics/chip.png

MCP3208

This is a python library designed to work with the MCP3208 ADC using SPI on a Raspberry Pi. The MCP3208 is capable of:

  • 12-bit resolution
  • ±1 LSB max DNL
  • ±1 LSB max INL (MCP3204/3208-B)
  • ±2 LSB max INL (MCP3204/3208-C)
  • 4 (MCP3204) or 8 (MCP3208) input channels
  • Analog inputs programmable as single-ended or pseudo-differential pairs
  • On-chip sample and hold
  • SPI serial interface (modes 0,0 and 1,1)
  • Single supply operation: 2.7V-5.5V
  • 100ksps max.sampling rate at VDD = 5V
  • 50ksps max. sampling rate at VDD = 2.7V
  • Low power CMOS technology
    • 500 nA typical standby current, 2 μA max.
    • 400 μA max. active current at 5V
  • Industrial temp range: -40°C to +85°C

For more information, see the datasheet.

Install

The preferred installation method is:

pip install mcp3208

Usage

from mcp3208 import MCP3208
import time

adc = MCP3208()

while True:
        for i in range(8):
                print('ADC[{}]: {:.2f}'.format(i, adc.read(i)))
        time.sleep(0.5)

SPI Interface

This chip uses SPI to interface with the Raspberry Pi. Basically, the chip returns 12 bits contained in 3 bytes. You are able to read the MCP3208 either LSB or MSB first.

https://raw.githubusercontent.com/MomsFriendlyRobotCompany/MCP3208/master/docs/pics/waveform.png

MIT License

Copyright (c) 2017 Kevin J. Walchko

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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