MCP cover image

RPI_MCP3008是一个库,可以收听MCP3008 A/D转换器芯片,如数据表中所述。

1

Github Watches

6

Github Forks

8

Github Stars

RPi_mcp3008

RPi_mcp3008 is a library to listen to the MCP3008 A/D converter chip with a RPi. This library implements the example communication protocol described in the datasheet.

Communication is made through RPi SPI port using SpiDev

Wiring

Connect the SPI data cables in the tables below. Choose either CE0# or CE1# to connect to CS.

RPi SPI GPIOs

RPi GPIO Mode
GPIO 07 CE1#
GPIO 08 CE0#
GPIO 09 MISO
GPIO 10 MOSI
GPIO 11 SCLK

MCP3008 Pinout

Pin Description Pin Description
01 CH0 09 Vdd - Supply voltage (2.7V - 5.5V)
02 CH1 10 Vref - Reference voltage
03 CH2 11 AGND - Analog ground
04 CH3 12 CLK - SPI Clock (SCLK)
05 CH4 13 Dout - Data out (MISO)
06 CH5 14 Din - Data in (MOSI)
07 CH6 15 CS - Chip select (CE0# or CE1#)
08 CH7 16 DGND - Digital ground

Please check the Adafruit guide on the MCP3008 for more information about wiring

Usage

RPi_mcp3008 uses the with statement to properly handle the SPI bus cleanup.

import mcp3008
with mcp3008.MCP3008() as adc:
    print(adc.read([mcp3008.CH0])) # prints raw data [CH0]

It's possible instantiate the object normally, but it's necessary to call the close method before terminating the program.

import mcp3008
adc = mcp3008.MCP3008()
print(adc.read([mcp3008.CH0])) # prints raw data [CH0]
adc.close()

The initialization arguments are MCP3008(bus=0, device=0, max_speed_hz=976000) where: MCP3008(X, Y) will open /dev/spidev-X.Y, same as spidev.SpiDev.open(X, Y) Both arguments are optional and have a default value of 0. The default max SPI driver speed is 976 kHz.

Methods

Currently there are two implemented methods:

def read(self, modes, norm=False):
    '''
    Returns the raw value (0 ... 1024) of the reading.
    The modes argument is a list with the modes of operation to be read (e.g.
    [mcp3008.CH0,mcp3008.Df0]).
    norm is a normalization factor, usually Vref.
    '''
def read_all(self, norm=False):
    '''
    Returns a list with the readings of all the modes
    Data Order:
    [DF0, DF1, DF2, DF3, DF4, DF5, DF6, DF7,
     CH0, CH1, CH2, CH3, CH4, CH5, CH6, CH7]
    norm is a normalization factor, usually Vref.
    '''
  • The modes argument must be a list with at least one of 16 modes listed below
  • The norm argument is a normalization factor that rescales raw data, usually Vref

Fixed mode

You can also declare the class with a fixed mode, which will make the instance callable and always return the value of the listed modes. Again you can normalize the data with the norm argument when calling the instance.

import mcp3008
with mcp3008.MCP3008.fixed([mcp3008.CH0, mcp3008.DF0]) as adc:
    print(adc())     # prints raw data [CH0, DF0]
    print(adc(5.2))  # prints normalized data [CH0, DF0]

MCP3008 Operation Modes

MCP3008 has 16 different operation modes: It can listen to each of the channels individually Single Ended or in a pseudo-differential mode Differential

Single Ended Differential
CH0 DF0 (CH0 = IN+; CH1 = IN-)
CH1 DF0 (CH0 = IN-; CH1 = IN+)
CH2 DF0 (CH2 = IN+; CH3 = IN-)
CH3 DF0 (CH2 = IN-; CH3 = IN+)
CH4 DF0 (CH4 = IN+; CH5 = IN-)
CH5 DF0 (CH4 = IN-; CH5 = IN+)
CH6 DF0 (CH6 = IN+; CH7 = IN-)
CH7 DF0 (CH6 = IN-; CH7 = IN+)

Use the table above as the operation mode when calling MCP3008.read(modes) or setting the MCP3008.fixed(modes) mode. (e.g. MCP3008.read([mcp3008.CH0, mcp3008.DF1]))

相关推荐

  • https://suefel.com
  • Latest advice and best practices for custom GPT development.

  • Yusuf Emre Yeşilyurt
  • I find academic articles and books for research and literature reviews.

  • https://maiplestudio.com
  • Find Exhibitors, Speakers and more

  • Carlos Ferrin
  • Encuentra películas y series en plataformas de streaming.

  • Contraband Interactive
  • Emulating Dr. Jordan B. Peterson's style in providing life advice and insights.

  • Joshua Armstrong
  • Confidential guide on numerology and astrology, based of GG33 Public information

  • rustassistant.com
  • Your go-to expert in the Rust ecosystem, specializing in precise code interpretation, up-to-date crate version checking, and in-depth source code analysis. I offer accurate, context-aware insights for all your Rust programming questions.

  • Emmet Halm
  • Converts Figma frames into front-end code for various mobile frameworks.

  • Alexandru Strujac
  • Efficient thumbnail creator for YouTube videos

  • Elijah Ng Shi Yi
  • Advanced software engineer GPT that excels through nailing the basics.

  • lumpenspace
  • Take an adjectivised noun, and create images making it progressively more adjective!

  • apappascs
  • 发现市场上最全面,最新的MCP服务器集合。该存储库充当集中式枢纽,提供了广泛的开源和专有MCP服务器目录,并提供功能,文档链接和贡献者。

  • ShrimpingIt
  • MCP系列GPIO Expander的基于Micropython I2C的操作,源自ADAFRUIT_MCP230XX

  • Mintplex-Labs
  • 带有内置抹布,AI代理,无代理构建器,MCP兼容性等的多合一桌面和Docker AI应用程序。

  • ravitemer
  • 一个功能强大的Neovim插件,用于管理MCP(模型上下文协议)服务器

  • jae-jae
  • MCP服务器使用剧作《无头浏览器》获取网页内容。

  • patruff
  • Ollama和MCP服务器之间的桥梁,使本地LLMS可以使用模型上下文协议工具

  • n8n-io
  • 具有本机AI功能的公平代码工作流程自动化平台。将视觉构建与自定义代码,自宿主或云相结合,400+集成。

  • WangRongsheng
  • 🧑‍🚀 llm 资料总结(数据处理、模型训练、模型部署、 o1 模型、mcp 、小语言模型、视觉语言模型)|摘要世界上最好的LLM资源。

  • pontusab
  • 光标与风浪冲浪社区,查找规则和MCP

    Reviews

    5 (1)
    Avatar
    user_T9o26zRg
    2025-04-17

    RPi_mcp3008 by luxedo is an excellent library for interfacing the MCP3008 ADC with Raspberry Pi. The documentation on the GitHub page is clear and easy to follow, making it a breeze to get started with analog-to-digital conversions on your projects. Highly recommend!