晚上带上gps逛了一圈

医生

<>前天夜晚忙到半夜，作了一根gps到pda的转换线。专用接口到串口。</P>
<><img src="attachments/dvbbs/2004-5/200451021324744.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2004-5/200451021324744.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
别看是串口线，但因为pda输出的是ttl电平，所以需要在中间有电平转换电路。用max232和4颗电容搞定。最难的是pda的借口定义找不到，没有示波器，只能根据电路板判断和试验，最终找出了TTL的in和out端口。</P><img src="attachments/dvbbs/2004-5/200451021627755.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2004-5/200451021627755.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

医生

<>电子市场找不到零买小型电容的，wjh啥时候帮我找几个阿，10uf到1uf的就行，那种很细的电解电容。</P><img src="attachments/dvbbs/2004-5/200451021845964.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2004-5/200451021845964.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
呵呵，gps+pda

医生

<>装上车，把长长的连接线固定好。下次再作个短的，专门连gps和pda用。</P><img src="attachments/dvbbs/2004-5/2004510211119809.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2004-5/2004510211119809.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

医生

<img src="attachments/dvbbs/2004-5/2004510211257585.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2004-5/2004510211257585.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

<>到外面了。</P>
<>固定的还挺牢的。变速线固定pda挺好的，还防震。</P>

开水

啊?医生这样做的目的是什么啊?把GPS彩色化吗?还是用你的GARMIN当作接收器?用218当作显示器?不过218的电力我是可以肯定的,爽就是一个字嘛~

医生

<><img src="attachments/dvbbs/2004-5/2004510211426170.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2004-5/2004510211426170.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
到钱塘江边了。可以看见箭头的方向。就是我的前进方向。</P>
<>速度是8.7。因为gps对速度的反应有点迟钝，他需要3-4秒来计算当前速度。所以显示不一样，只有 7.22.</P>
<>右边gps显示卫星图，现在收到6颗卫星的信号，精确度6米</P>

医生

是啊。用GARMIN当作接收器，用218当作高精度地图显示器。

医生

这样的配合在长途和到达陌生城市还是非常有用的。至少对自己的位置情况和道路情况了如指掌。不用担心绕远路了。

hzwjh

佩服，佩服，全能选手啊！218的接口的定义原来是公开的啊？MAX232据说可以免费搞到。

[此贴子已经被作者于2004-5-10 21:30:34编辑过]

医生

<>不公开的。我只通过usb的数据线找到了地线，然后量出电源输出。TX和 RX是我反复通过软件建立通讯一个一个脚试出来的，辛苦阿。 </P>

hzwjh

[em17][em17][em17][em17][em17][em17]

开水

<>狠厉害!我现在只有TE了,不知道有什么合适的软件?当然我还没有GPS接收器的说,TE的电池恐怕还需要一个劲爆一点的电池包...真的后悔卖掉了我的XP210~</P>