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标题“lcd.zip_open”暗示了我们正在处理一个与LCD（液晶显示器）技术相关的开源项目，而这个项目的重点可能在于如何打开或访问LCD设备。描述中的“open source open source1 open source3 open source5”强调了项目的开源特性，意味着源代码是公开的，允许社区成员查看、学习和改进代码。在IT领域，LCD技术广泛应用于各种电子设备，如手机、电视、电脑显示器等。LCD的工作原理基于电致发光效应，通过控制液晶分子排列来调节光线的通过，从而实现显示图像。开源LCD项目通常涉及到驱动程序开发、图形界面设计、硬件接口控制等方面。驱动程序开发是关键，因为LCD需要特定的驱动来与主机系统通信。开源项目可能包括为不同操作系统（如Linux、Windows或Android）编写或修改LCD驱动，确保设备能够正确识别并控制LCD面板。这些驱动通常需要理解硬件接口，如SPI、I2C或并行接口，并实现相应的控制命令。图形界面设计部分可能涉及到用户交互界面的创建，例如设置屏幕亮度、分辨率或色彩校准。开源项目可能包含使用Qt、GTK+或其它开源库构建的GUI工具，用户可以通过这些工具来配置LCD的显示参数。再次，硬件接口控制是连接LCD与主板的关键环节。开源项目可能会提供详细文档，解释如何连接和配置这些接口，以便开发者可以将LCD集成到他们的硬件系统中。这可能涉及到电路设计、焊接技巧以及如何编写固件来初始化和控制LCD。开源项目的一大优点是社区支持。在“open”标签下，我们可以期待找到论坛、邮件列表或GitHub仓库，其中包含了讨论、问题解答、代码贡献和版本更新。开发者可以在这里寻求帮助，分享自己的进展，甚至与其他志同道合的人合作开发新功能。 “lcd.zip_open”项目涵盖了LCD技术的多个方面，从硬件驱动编程到用户界面设计，再到社区协作。开源性质使得这个项目对初学者和经验丰富的开发者都有吸引力，他们可以自由地探索、学习和改进LCD的使用和控制。通过参与这样的项目，不仅可以提升编程技能，还能深入了解嵌入式系统的运作机制，以及如何在实际应用中利用开源资源解决问题。

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><head><title>ATmega32 Development System - LCD Display 128x64 Graphical LCD Interfacing Switches</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link href="style.css" rel="stylesheet" type="text/css" /> <style type="text/css" media="print"> body { visibility: hidden; display: none } </style> <script type="text/javascript"> var _gaq = _gaq || []; _gaq.push(['_setAccount', 'UA-17003396-1']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); </script> </head> <body style="color: rgb(0, 0, 0);" alink="#ee0000" link="#0000ee" vlink="#551a8b">  <script language="JavaScript"> browser = (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 4 )) || ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 ))); function warn() { if (event.button==2) { alert('Please remember that the content and structure\n' + 'of this site are copyright. - Peter J. Vis.') } } document.onmousedown = warn; </script> <div id="wrapper"> <div id="nav"> <ul> <li><a href="../../index.html">home</a></li> <li><a href="../../experience.html">Experience</a></li> <li><a href="../../gallery.html">gallery</a></li> <li><a href="../../interests.html">Interests</a></li> <li class="lastchild"><a href="../../contact.html">contact</a></li> </ul> </div>  <div id="body"> <div style="text-align: center;"></div> <div id="current"> <div style="text-align: center;"></div>  </div>  <div id="content"> <h2><img style="width: 666px; height: 37px;" src="images/topline.gif" alt="" /> </h2> <div class="contentbox"> <div id="pv"> <big style="font-weight: bold;"><big><big>Graphical LCD</big></big></big> Graphical LCD's are a relatively new concept, and worth using. I managed to acquire one from a supplier in China for as little as £10.00 inc P+P. UK suppliers wanted three times that amount. <img style="width: 405px; height: 304px;" alt="" src="lcd/syb12864-1.JPG" /> </div> <big style="font-weight: bold;"><big><big> </big></big></big><big style="font-weight: bold;"><big><big><a href="introduction.html">Introduction</a> <a href="specification.html">Specification</a> <a href="main%20board.html">Main Board</a> <a href="lights%20and%20switches.html">Lights & Switches</a> <a href="sensors.html">Sensors</a> <a href="analog%20board.html">Analog</a> <a href="uart.html">UART Interface</a> <a href="lcd.html">Graphical LCD</a> <a href="Forum.html">Forum</a> <a href="../C++.html">Projects</a></big></big></big><big style="font-weight: bold;"><big><big> </big></big></big></div>  <h2><img style="width: 666px; height: 38px;" alt="" src="images/topline.gif" /> </h2> <div class="contentbox"> LCD Board Schematic <img style="width: 607px; height: 657px;" alt="" src="lcd/lcd%20schematic.bmp" /> Circuit Operation The LCD is the most expensive component, I didn't want the backlight to burn out within a few months. Although the backlight is specified to work on 5v (LCD Pin 19), I decided to under run it on it's minimum threshold value just under 5v at around 4.8v.  This was achieved with 2 4.7 ohm resistors in parallel. A 25K pot is used to control the brightness. Originally I used a 10K pot however it didn't provide a good variation that I was looking for. A jumper JP is used to to isolate PB5 which is also MOSI when using an ISP programmer. I was able to source some non-expensive slide switches, so I decided to use that instead of jumper JP. I also added a slide switch to control the power on pin 2 of the LCD. The LCD data lines  pins 7 to 14 occupy a complete port D of the ATmega32. The control lines of the LCD occupy port B. PB6 and PB7 are not used as they are also MISO and SCK and used by the ISP. I have a separate section on how the 128x64 graphical LCD works <a href="../128x64/128x64.html">here</a>. Veroboard Build <img style="width: 622px; height: 1011px;" alt="" src="lcd/lcdvero.gif" /> Components: SW1, SW2 Slide switches, VR1 25K, R1 & R2 4.7k, LCD SYB12864C Ice Blue screen. Obviously, the links under the LCD should be made first before soldering the LCD in place. All links under the LCD should be made with insulated wire. There is plenty of space for the links to go under the LCD, alternatively they could be made on the track side. Light blue diagonal links are LCD data bus lines. SYB12864 LCD Specification Here is a quick llittle drawing I made in CAD.  <img style="width: 610px; height: 492px;" alt="" src="lcd/lcd.gif" /><big> PIN 01    Vss        Ground 02    Vdd        Power +5v +10% 03    Vo         LCD Brightness Control 04    D / I      Data:H Instruction:L 05    R / W      Read / Write 06    E          Enable Trigger 07    DB0        Data Bus 08    </big><big>DB1        Data Bus </big><big> 09    </big><big>DB2

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