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ds18b20在stm32f303上的例程，亲测可用。采用串口可以观察到数据

随着对电冰箱在节能、环保、舒适等方面的要求不断提高，越来越多的智能控制技术引入到电冰箱中。嵌入式智能家用电器也简称为智能家用电器。

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基于51单片机(AT89C52)设计的时钟，资源包含C语言源代码，可烧写的Hex文件，Proteus仿真图。

主要内容 搭建开发环境 安装SDCC 安装stcgal 安装USB转串口驱动CH341_MAC 实例代码Demo_Cycle.c 编译代码 烧录程序 Makefile编写 搭建开发环境 Mac系统版本: MacOS Catalina USB转串口: CH340/341 单片机型号: STC90C52RC 安装SDCC 简介 SDCC是什么？其实sdcc就是一个提供优化标准 C (ANSI C89, ISO C99, ISO C11) 的编译器套件。知道这么多已经够了，内部兼容多种单片机的编译。 在Mac使用包管理工具安装sdcc 192:~ ichabodcrane$ brew install

SynPDF ====== Synopse PDF engine is a fully featured *Open Source* PDF document creation library for Delphi and FPC, embedded in one unit. It's used e.g. in our [*mORMot* framework](https://github.com/synopse/mORMot), for creating PDF files from generated reports. But you can use it stand-alone, without our main ORM/SOA framework. If you download the whole *mORMot* source code, you do not need this separate package: ensure you get rid of any existing separated *SynPDF* installation, and use the PDF units as available in the main *mORMot* trunk. This *SynPDF* distribution/GitHub account targets only people needing PDF writing, without other *mORMot* features. Features -------- * Pure Delphi code, with no external .dll, and adding very small code size to your executable; * Targets Delphi 5 up to Delphi 10 Seattle (and latest version of FPC), for Win32 and Win64 platforms, with full source code provided; * Includes most vectorial drawing commands, including text,lines or curves; * Renders bitmaps, and metafiles (even most .emf files with clipping and regioning); * Introduce metadata, bookmarks and outline information; * Produce very small .pdf files; * Optionally [encrypt and secure the .pdf content](http://blog.synopse.info/post/2013/06/19/SynPDF-now-implements-40-bit-and-128-bit-security) using 40 bit or 128 bit keys; * Fast file generation with low memory overhead (tested with several thousands of pages); * Access a true VCL TCanvas instance to create the PDF content; * Optionally embed True Type fonts subsets; * Unicode ready, even with pre-Unicode versions of Delphi, including advanced [Uniscribe Glyph shading and Font fallback](http://blog.synopse.info/tag/Uniscribe); * Can publish PDF/A-1 archive files; * Used in a lot of applications, with regular enhancements, mainly from active end-users; * Licensed under a [MPL/GPL/LGPL tri-license](http://synopse.info/forum/viewtopic.php?id=27). Sample code ----------- In fact, you have at least three ways of generating pdfs using the library: * [Directly call](http://synopse.info/forum/viewtopic.php?pid=370#p370) of a `TPdfCanvas` as published by a `TPdfDocument` instance - this is the most direct but also more difficult way of rendering; * [Use regular VCL `TCanvas` methods](http://synopse.info/forum/viewtopic.php?pid=1909#p1909) thanks to `TMetaFile` support - see `TPdfDocumentGDI.VCLCanvas` property and the `TPdfCanvas.RenderMetaFile` method - this is very easy if you want to use "regular" `TCanvas` methods to draw the page content, especially if you have some existing printing code; * [Use `TGDIPages` of the supplied `mORMotReport.pas` unit](http://blog.synopse.info/post/2010/06/30/Making-report-from-code) (extracted from our *mORMot* ORM/SOA framework) to easily create the content from code, with some report-oriented methods (including complex rtf with `TGDIPages.AppendRichEdit`) - for basic reporting features, it is pretty much the solution. The 2nd and 3rd ways are preferred, for most applications. Documentation

DS18B20可编程分辨率的单总线®数字温度计 DS18B20 数字温度计提供9-12 位摄氏温度测量而且有一个由高低电平触发的可 编程的不因电源消失而改变的报警功能。DS18B20通过一个单线接口发送或接受 信息，因此在中央处理器和DS18B20 之间仅需一条连接线（加上地线）。它的测 温范围为-55～＋125℃，并且在-10～＋85℃精度为±5℃。除此之外，DS18B20 能直接从单线通讯线上汲取能量，除去了对外部电源的需求。

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