怎么使用PIC24FJ64 GB00在4位模式下工作

在过去的几年里，我从易趣网获得了2×16的LCD。不用说，它们没有数据表，而且几乎没有识别标记。我有一个标记为“LCM1602G-V2.0”，这对我在谷歌上没有任何帮助。我正在尝试使用PICB的6个引脚使用PIC24FJ64 GB00在4位模式下工作。我以前做过，但很久以前我记不起我是怎么做的，现在有麻烦了。我的研究表明，只有那些具有TTL输入的LCD可以直接从3.3伏逻辑的PIC驱动。我不知道这些单位我踢我家周围是3.3 TTL或5伏特CMOS输入。由于我的CCT到目前为止还没有工作，我想确保这不仅仅是一个简单的例子，而不是我的硬盘，如果我的液晶显示器使用CMOS。我确实有一个ILQ74光隔离器，如果需要，将得到一个电阻总线包的输入，如果需要的话。我不想为了驱动这个显示器而使用一些谨慎的晶体管，坦白地说，虽然我的电源板上有双电源3.3/5伏，但是如果我能用3.3伏特来供电的话，生活会更好。有什么建议或建议吗？谁知道如何知道在LCD上使用什么输入技术？谢谢您。



      以下为原文

    I have acquired 2 X 16 LCDs over the last few years from Ebay. Needless to say, they came with no datasheets and have very little identifying markings on them. I have one that is marked "LCM1602G-V2.0" which doesn't do anything for me on Google. I am trying to get it working with a PIC24FJ64GB002 in 4 bit mode using 6 pins of PortB. I've done this before but so long ago that I can't remember how I did it and am having trouble now. My research indicates that only those LCD's with TTL inputs can be driven directly from a PIC with 3.3 volt logic. I can't tell if these units I have kicking around my house are 3.3 TTL or 5 volt CMOS inputs. Since my cct so far is not working, I want to make sure that it's not just a simple case of me not driving it hard enough in case my LCD is using CMOS. I do have an ILQ74 opto isolator and will, if needed get a resistor bus pack for the inputs if need be.. I don't want to get into discreet transistors for driving this display and quite frankly, while I do have dual power 3.3/5 volts on my breadboard, life would be a lot nicer if I could just use 3.3 volts to power everything. Any suggestions or tips ? Anyone know how to tell what input technology is being used on an LCD ? Thank you.