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MCP23017 for Micro:bit使用教程(MCP23017_for_micro-bit).pdf

发布时间：2023-11-29 发布人：admin 分类：养殖 资料大小：0.24M 资料格式：pdf 举报 版权申诉
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    本章将介绍 Micro:bit 通过 MCP23017 IO Expansion Board 进行 GPIO 扩展。 IO 扩展 1.基本介绍 MCP23017 IO Expansion Board 是一款 GPIO 扩展板，如果遇到 Micro:bit 的 IO 口不够使用的情况，可用该模块进行扩展，该模块采用 I2C 通信接口，可扩 展 16 个 GPIO 口。 2.硬件连接 在硬件连接上，采用 Micro:bit 的 I2C 接口与该模块连接，通过读写 MCP23017 寄存器，从而控制 MCP23017 的引脚电平，实现 IO 扩展。 Micro:bit MCP23017 IO Expansion Board VCC GND SCL SDA VCC GND SCL SDA 具体硬件连接和 BME280 一致。 3.软件设计 打开 makecode，添加软件包，输入链接： https://github.com/waveshare/CourseKit 添加软件包成功后，采用积木块编写以下程序：
    下载，点击显示数据(设备)按钮，将显示 B 组引脚高低电平状态的数据，如 果让引脚悬空，由于将引脚内部连接了上拉电阻，则读取的输入状态为高电平， 读取 B 组引脚电平状态的数据如下图所示： 同时，PA7-PA0 分别输出低-高-低-高-低-高-低-高的电平状态，将 A 组引脚 连接到 LED 可观察现象。
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