21ic电子技术开发论坛 › 综合技术交流 › 电子技术交流论坛 › 单片机如何检测到勺子放到盘子里？
12345下一页
返回列表 发新帖我要提问

单片机如何检测到勺子放到盘子里？

[复制链接]
22740|95
冬来顺 发表于 2008-10-13 17:14 | 显示全部楼层

楼主是保姆

楼主是保姆
回复

收藏 举报

oufuqiang 发表于 2008-10-13 23:28 | 显示全部楼层

哎，线圈细点，圈数多点，用个普通运放也OK拉，做I-V转换。

  
回复

收藏 举报

 楼主| doob 发表于 2008-10-14 09:16 | 显示全部楼层

xie

oufuqiang:<br />&nbsp;线圈细点，圈数多点，用个普通运放也OK拉，做I-V转换。<br /><br />&nbsp;&nbsp;大概说说参数吗，我按你的参数再试试，加运放，I-V转化<br />怎么做啊？<br />&nbsp;<br />
回复

收藏 举报

oufuqiang 发表于 2008-10-14 10:59 | 显示全部楼层

i-v converter

<img src="http://www.kyosemi.co.jp/product/data/img/KPDU34PS1_08.gif">
回复

收藏 举报

oufuqiang 发表于 2008-10-14 11:02 | 显示全部楼层

Operational Amplifiers

<B><font color=#3333FF>PH217&nbsp;Lab&nbsp;8&nbsp;-&nbsp;Operational&nbsp;Amplifiers</font></B>&nbsp;<br /><font color=#3333FF>(1&nbsp;week)</font>[BLOCKQUOTE]<img src="http://www.mines.edu/Academic/courses/physics/phgn217/images/getacro.gif">&nbsp;<br /><B><font color=#FFCC00>click&nbsp;the&nbsp;title&nbsp;to&nbsp;download&nbsp;pdf</font></B>[/BLOCKQUOTE]<B><font color=#FF0000>Objectives:</font></B>&nbsp;<OL><li>Learn&nbsp;the&nbsp;basic&nbsp;properties&nbsp;of&nbsp;op-amps.&nbsp;<li>Construct&nbsp;and&nbsp;analyze&nbsp;several&nbsp;op-amp&nbsp;circuits.&nbsp;<li>Recognize&nbsp;limitations&nbsp;of&nbsp;real&nbsp;op-amps.&nbsp;</li></OL><B><font color=#3333FF>Hints&nbsp;and&nbsp;Precautions:</font></B>&nbsp;<OL><li>Make&nbsp;sure&nbsp;the&nbsp;V+&nbsp;(pin&nbsp;7)&nbsp;and&nbsp;V-&nbsp;(pin&nbsp;4)&nbsp;of&nbsp;the&nbsp;741&nbsp;are&nbsp;connected&nbsp;to&nbsp;+15&nbsp;and&nbsp;-15&nbsp;volts&nbsp;respectively.&nbsp;<li>Use&nbsp;short&nbsp;wires&nbsp;and&nbsp;shielded&nbsp;(BNC)&nbsp;cables&nbsp;as&nbsp;much&nbsp;as&nbsp;possible&nbsp;to&nbsp;minimize&nbsp;high&nbsp;frequency&nbsp;noise&nbsp;pickup.&nbsp;<li>Install&nbsp;1&nbsp;m&nbsp;F&nbsp;capacitors&nbsp;from&nbsp;the&nbsp;power&nbsp;supplies&nbsp;to&nbsp;ground&nbsp;near&nbsp;the&nbsp;op&nbsp;amp&nbsp;to&nbsp;filter&nbsp;noise&nbsp;on&nbsp;the&nbsp;power&nbsp;supply&nbsp;lines.&nbsp;<li>Check&nbsp;the&nbsp;pin&nbsp;diagram&nbsp;below&nbsp;for&nbsp;proper&nbsp;connections.&nbsp;<B>The&nbsp;diagram&nbsp;is&nbsp;a&nbsp;top&nbsp;view.</B>&nbsp;</li></OL><img src="http://www.mines.edu/Academic/courses/physics/phgn217/lab8/Image51.gif"><br /><B><font color=#FF0000>Procedure:</font></B>&nbsp;<br /><B><font color=#3333FF>1.&nbsp;Inverting&nbsp;amplifier</font></B>&nbsp;<br />Construct&nbsp;an&nbsp;inverting&nbsp;amplifier&nbsp;using&nbsp;a&nbsp;741&nbsp;op-amp&nbsp;with&nbsp;a&nbsp;1&nbsp;k&nbsp;W&nbsp;input&nbsp;resistor&nbsp;and&nbsp;a&nbsp;10&nbsp;kW&nbsp;feedback&nbsp;resistor.&nbsp;What&nbsp;do&nbsp;you&nbsp;expect&nbsp;for&nbsp;the&nbsp;voltage&nbsp;gain?&nbsp;Input&nbsp;a&nbsp;1V<SUB>pp</SUB>&nbsp;1kHz&nbsp;sine&nbsp;wave&nbsp;with&nbsp;no&nbsp;DC&nbsp;offset,&nbsp;measure&nbsp;the&nbsp;gain&nbsp;at&nbsp;a&nbsp;few&nbsp;different&nbsp;frequencies&nbsp;(measure&nbsp;every&nbsp;decade&nbsp;as&nbsp;we&nbsp;did&nbsp;in&nbsp;the&nbsp;RLC&nbsp;lab)&nbsp;and&nbsp;record&nbsp;the&nbsp;results.&nbsp;In&nbsp;particular,&nbsp;how&nbsp;high&nbsp;in&nbsp;frequency&nbsp;can&nbsp;you&nbsp;go&nbsp;without&nbsp;deviating&nbsp;from&nbsp;what&nbsp;you&nbsp;expect?&nbsp;What&nbsp;happens&nbsp;at&nbsp;very&nbsp;high&nbsp;frequencies?&nbsp;<br /><img src="http://www.mines.edu/Academic/courses/physics/phgn217/lab8/Image58.gif"><B><font color=#3333FF>2.&nbsp;Summing&nbsp;amplifier</font></B>&nbsp;<br />Construct&nbsp;a&nbsp;two&nbsp;input&nbsp;summing&nbsp;amplifier&nbsp;using&nbsp;a&nbsp;741&nbsp;op-amp&nbsp;with&nbsp;100&nbsp;kW&nbsp;resistors&nbsp;for&nbsp;both&nbsp;input&nbsp;and&nbsp;feedback&nbsp;resistances.&nbsp;Using&nbsp;your&nbsp;function&nbsp;generator&nbsp;and&nbsp;a&nbsp;variable&nbsp;DC&nbsp;source,&nbsp;generate&nbsp;a&nbsp;few&nbsp;different&nbsp;input&nbsp;voltages&nbsp;and&nbsp;measure&nbsp;the&nbsp;output.&nbsp;NOTE:&nbsp;You&nbsp;can&nbsp;make&nbsp;a&nbsp;variable&nbsp;DC&nbsp;source&nbsp;by&nbsp;connecting&nbsp;one&nbsp;end&nbsp;of&nbsp;a&nbsp;10&nbsp;KW&nbsp;potentiometer&nbsp;to&nbsp;5&nbsp;V&nbsp;DC,&nbsp;the&nbsp;other&nbsp;end&nbsp;to&nbsp;ground,&nbsp;and&nbsp;taking&nbsp;the&nbsp;variable&nbsp;output&nbsp;from&nbsp;the&nbsp;wiper.&nbsp;<br />Does&nbsp;the&nbsp;output&nbsp;agree&nbsp;with&nbsp;what&nbsp;you&nbsp;would&nbsp;expect?&nbsp;What&nbsp;is&nbsp;the&nbsp;voltage&nbsp;at&nbsp;the&nbsp;summing&nbsp;point?&nbsp;Change&nbsp;one&nbsp;of&nbsp;the&nbsp;input&nbsp;resistors&nbsp;to&nbsp;50k&nbsp;W&nbsp;and&nbsp;re-measure&nbsp;the&nbsp;output&nbsp;for&nbsp;the&nbsp;input&nbsp;voltages&nbsp;used&nbsp;in&nbsp;the&nbsp;last&nbsp;part&nbsp;of&nbsp;this&nbsp;section.&nbsp;How&nbsp;does&nbsp;this&nbsp;modification&nbsp;change&nbsp;the&nbsp;output?&nbsp;Is&nbsp;this&nbsp;consistent&nbsp;with&nbsp;what&nbsp;you&nbsp;expect&nbsp;(check&nbsp;the&nbsp;textbook)?&nbsp;<img src="http://www.mines.edu/Academic/courses/physics/phgn217/lab8/Image59.gif"><B><font color=#6633FF>3.&nbsp;Non-inverting&nbsp;AC&nbsp;Amplifier</font></B>&nbsp;<br />Construct&nbsp;a&nbsp;non-inverting&nbsp;AC&nbsp;amplifier&nbsp;using&nbsp;a&nbsp;741&nbsp;Op-Amp&nbsp;(see&nbsp;diagram&nbsp;below).&nbsp;Select&nbsp;values&nbsp;of&nbsp;resistances&nbsp;and&nbsp;capacitance&nbsp;to&nbsp;give&nbsp;a&nbsp;gain&nbsp;of&nbsp;around&nbsp;10&nbsp;and&nbsp;a&nbsp;breakpoint&nbsp;frequency&nbsp;of&nbsp;around&nbsp;100&nbsp;Hz&nbsp;(NOTE:&nbsp;You&nbsp;probably&nbsp;won’t&nbsp;be&nbsp;able&nbsp;to&nbsp;get&nbsp;exact&nbsp;values&nbsp;for&nbsp;gain&nbsp;and&nbsp;breakpoint&nbsp;since&nbsp;our&nbsp;selection&nbsp;of&nbsp;component&nbsp;values&nbsp;is&nbsp;limited&nbsp;and&nbsp;the&nbsp;tolerances&nbsp;are&nbsp;quite&nbsp;wide.)&nbsp;Measure&nbsp;and&nbsp;record&nbsp;the&nbsp;gain&nbsp;in&nbsp;decade&nbsp;frequency&nbsp;steps&nbsp;from&nbsp;10&nbsp;Hz&nbsp;to&nbsp;100&nbsp;kHz.&nbsp;Did&nbsp;your&nbsp;circuit&nbsp;performance&nbsp;meet&nbsp;your&nbsp;design&nbsp;requirements?&nbsp;<img src="http://www.mines.edu/Academic/courses/physics/phgn217/lab8/Image60.gif"><B><font color=#6633FF>4.&nbsp;Current&nbsp;to&nbsp;Voltage&nbsp;Converter&nbsp;-&nbsp;Application&nbsp;to&nbsp;Photodiodes</font></B>&nbsp;<br />Construct&nbsp;a&nbsp;current&nbsp;to&nbsp;voltage&nbsp;converter&nbsp;using&nbsp;a&nbsp;741&nbsp;Op-Amp.&nbsp;Record&nbsp;the&nbsp;output&nbsp;signal&nbsp;(scope&nbsp;trace).&nbsp;<br /><img src="http://www.mines.edu/Academic/courses/physics/phgn217/lab8/Image61.gif"><br /><font color=#6633FF>5<B>.&nbsp;Relaxation&nbsp;oscillator</B></font>&nbsp;<br />Construct&nbsp;the&nbsp;circuit&nbsp;shown&nbsp;below&nbsp;using&nbsp;a&nbsp;741.&nbsp;Use&nbsp;a&nbsp;variable&nbsp;resistor&nbsp;box&nbsp;for&nbsp;the&nbsp;feedback&nbsp;resistance.&nbsp;Does&nbsp;the&nbsp;waveform&nbsp;have&nbsp;the&nbsp;expected&nbsp;frequency?&nbsp;Measure&nbsp;the&nbsp;frequency&nbsp;as&nbsp;a&nbsp;function&nbsp;of&nbsp;the&nbsp;resistance&nbsp;in&nbsp;the&nbsp;feedback.&nbsp;What&nbsp;is&nbsp;the&nbsp;duty&nbsp;cycle?&nbsp;What&nbsp;are&nbsp;the&nbsp;minimum&nbsp;and&nbsp;maximum&nbsp;voltages&nbsp;measured?&nbsp;Draw&nbsp;a&nbsp;representative&nbsp;output.&nbsp;<img src="http://www.mines.edu/Academic/courses/physics/phgn217/lab8/Image64.gif"><br /><font color=#6633FF>6<B>.&nbsp;Op-Amp&nbsp;non-ideal&nbsp;behavior&nbsp;-&nbsp;Nulling&nbsp;the&nbsp;offset</B></font>&nbsp;<br />Construct&nbsp;an&nbsp;inverting&nbsp;amplifier&nbsp;with&nbsp;a&nbsp;gain&nbsp;of&nbsp;100&nbsp;and&nbsp;an&nbsp;input&nbsp;impedance&nbsp;of&nbsp;1&nbsp;kW&nbsp;using&nbsp;a&nbsp;741&nbsp;Op-Amp.&nbsp;Ground&nbsp;the&nbsp;input&nbsp;end&nbsp;of&nbsp;the&nbsp;input&nbsp;resistor&nbsp;and&nbsp;measure&nbsp;the&nbsp;output&nbsp;voltage.&nbsp;The&nbsp;measured&nbsp;output&nbsp;voltage&nbsp;is&nbsp;an&nbsp;amplified&nbsp;(by&nbsp;100)&nbsp;offset.&nbsp;To&nbsp;correct&nbsp;for&nbsp;this&nbsp;offset,&nbsp;install&nbsp;an&nbsp;offset&nbsp;null&nbsp;circuit&nbsp;per&nbsp;the&nbsp;diagram&nbsp;shown&nbsp;in&nbsp;the&nbsp;741&nbsp;engineering&nbsp;data&nbsp;sheet&nbsp;(bottom&nbsp;of&nbsp;page&nbsp;1).&nbsp;Measure&nbsp;the&nbsp;change&nbsp;in&nbsp;output&nbsp;voltage&nbsp;as&nbsp;the&nbsp;null&nbsp;potentiometer&nbsp;is&nbsp;varied&nbsp;across&nbsp;its&nbsp;range.&nbsp;Adjust&nbsp;the&nbsp;null&nbsp;potentiometer&nbsp;for&nbsp;an&nbsp;op-amp&nbsp;output&nbsp;voltage&nbsp;of&nbsp;0.<font color=#FF0000>&nbsp;<B>Save&nbsp;this&nbsp;circuit&nbsp;for&nbsp;the&nbsp;next&nbsp;section</B></font><B>.</B>&nbsp;<br /><B><font color=#6633FF>7.&nbsp;Op-Amp&nbsp;Integrator&nbsp;(Low&nbsp;Pass&nbsp;Filter)</font></B>&nbsp;<br />Using&nbsp;the&nbsp;nulled&nbsp;op-amp&nbsp;circuit&nbsp;constructed&nbsp;in&nbsp;the&nbsp;last&nbsp;section&nbsp;construct&nbsp;an&nbsp;integrator&nbsp;circuit&nbsp;using&nbsp;values&nbsp;of&nbsp;100kW&nbsp;for&nbsp;R1,&nbsp;10MW&nbsp;for&nbsp;R2&nbsp;and&nbsp;0.01m&nbsp;F&nbsp;for&nbsp;the&nbsp;capacitor.&nbsp;Use&nbsp;the&nbsp;function&nbsp;generator&nbsp;to&nbsp;inject&nbsp;sine&nbsp;wave&nbsp;AC&nbsp;input&nbsp;signals&nbsp;over&nbsp;a&nbsp;wide&nbsp;range&nbsp;of&nbsp;frequencies&nbsp;(every&nbsp;decade&nbsp;again)&nbsp;and&nbsp;record&nbsp;input&nbsp;and&nbsp;output&nbsp;levels.&nbsp;This&nbsp;circuit&nbsp;is&nbsp;very&nbsp;sensitive&nbsp;to&nbsp;input&nbsp;signal&nbsp;DC&nbsp;offset&nbsp;so,&nbsp;if&nbsp;the&nbsp;output&nbsp;is&nbsp;saturated&nbsp;at&nbsp;either&nbsp;+&nbsp;or&nbsp;–&nbsp;15&nbsp;volts,&nbsp;adjust&nbsp;the&nbsp;function&nbsp;generator&nbsp;DC&nbsp;offset&nbsp;until&nbsp;the&nbsp;output&nbsp;reference&nbsp;level&nbsp;returns&nbsp;to&nbsp;zero.&nbsp;An&nbsp;alternative&nbsp;is&nbsp;to&nbsp;add&nbsp;a&nbsp;1m&nbsp;F&nbsp;blocking&nbsp;capacitor&nbsp;on&nbsp;the&nbsp;input&nbsp;to&nbsp;remove&nbsp;the&nbsp;DC&nbsp;level.&nbsp;What&nbsp;is&nbsp;the&nbsp;relationship&nbsp;between&nbsp;input&nbsp;and&nbsp;output&nbsp;levels?&nbsp;What&nbsp;is&nbsp;the&nbsp;role&nbsp;of&nbsp;the&nbsp;10MW&nbsp;resistor&nbsp;in&nbsp;the&nbsp;feedback&nbsp;path?&nbsp;Remove&nbsp;it&nbsp;and&nbsp;see&nbsp;what&nbsp;happens.&nbsp;Observe&nbsp;the&nbsp;integrator&nbsp;outputs&nbsp;for&nbsp;different&nbsp;input&nbsp;waveforms&nbsp;(triangle&nbsp;and&nbsp;square&nbsp;wave).&nbsp;Record&nbsp;the&nbsp;input&nbsp;waveforms&nbsp;and&nbsp;resulting&nbsp;output&nbsp;waveforms.&nbsp;<img src="http://www.mines.edu/Academic/courses/physics/phgn217/lab8/Image62.gif"><B><font color=#6633FF>8.&nbsp;Instrumentation&nbsp;Amplifier</font></B>&nbsp;<br />Construct&nbsp;an&nbsp;instrumentation&nbsp;amplifier&nbsp;following&nbsp;the&nbsp;circuit&nbsp;shown.&nbsp;This&nbsp;is&nbsp;an&nbsp;amplifier&nbsp;designed&nbsp;to&nbsp;reject&nbsp;common&nbsp;mode&nbsp;signals&nbsp;(i.e.&nbsp;signals&nbsp;that&nbsp;appear&nbsp;on&nbsp;both&nbsp;input&nbsp;leads)&nbsp;that&nbsp;often&nbsp;interfere&nbsp;with,&nbsp;or&nbsp;even&nbsp;obscure,&nbsp;the&nbsp;signal&nbsp;you&nbsp;are&nbsp;trying&nbsp;to&nbsp;amplify.&nbsp;Choose&nbsp;resistor&nbsp;values&nbsp;to&nbsp;give&nbsp;a&nbsp;reasonable&nbsp;overall&nbsp;gain&nbsp;(around&nbsp;10)&nbsp;for&nbsp;the&nbsp;input&nbsp;amplifiers&nbsp;and&nbsp;a&nbsp;gain&nbsp;of&nbsp;1&nbsp;for&nbsp;U<SUB>&nbsp;3</SUB>.&nbsp;<br />Test&nbsp;your&nbsp;instrumentation&nbsp;amplifier&nbsp;to&nbsp;see&nbsp;if&nbsp;you&nbsp;met&nbsp;your&nbsp;design&nbsp;goals.&nbsp;Inject&nbsp;a&nbsp;2&nbsp;V&nbsp;p-p&nbsp;high&nbsp;frequency&nbsp;AC&nbsp;signal&nbsp;into&nbsp;both&nbsp;inputs&nbsp;and&nbsp;record&nbsp;the&nbsp;output&nbsp;signal.&nbsp;How&nbsp;far&nbsp;was&nbsp;the&nbsp;input&nbsp;attenuated&nbsp;at&nbsp;the&nbsp;output?&nbsp;Now&nbsp;inject&nbsp;a&nbsp;1&nbsp;V&nbsp;p-p&nbsp;1&nbsp;kHz&nbsp;signal&nbsp;with&nbsp;no&nbsp;DC&nbsp;offset&nbsp;to&nbsp;one&nbsp;of&nbsp;the&nbsp;amplifier&nbsp;inputs&nbsp;and&nbsp;ground&nbsp;the&nbsp;other&nbsp;input.&nbsp;What&nbsp;is&nbsp;the&nbsp;output&nbsp;level?&nbsp;<br />One&nbsp;quick&nbsp;way&nbsp;of&nbsp;testing&nbsp;for&nbsp;common&nbsp;mode&nbsp;rejection&nbsp;is&nbsp;to&nbsp;place&nbsp;your&nbsp;fingers&nbsp;on&nbsp;the&nbsp;inverting&nbsp;and&nbsp;non-inverting&nbsp;inputs&nbsp;and&nbsp;see&nbsp;if&nbsp;the&nbsp;noise&nbsp;you&nbsp;inject&nbsp;is&nbsp;ignored&nbsp;(yes,&nbsp;you&nbsp;make&nbsp;a&nbsp;pretty&nbsp;good&nbsp;antenna&nbsp;for&nbsp;noise&nbsp;signals).&nbsp;Of&nbsp;course&nbsp;this&nbsp;isn’t&nbsp;a&nbsp;good&nbsp;idea&nbsp;if&nbsp;you&nbsp;are&nbsp;using&nbsp;FET&nbsp;op-amps&nbsp;with&nbsp;no&nbsp;protection&nbsp;circuitry.&nbsp;You&nbsp;could&nbsp;end&nbsp;up&nbsp;destroying&nbsp;your&nbsp;circuit.&nbsp;<img src="http://www.mines.edu/Academic/courses/physics/phgn217/lab8/Image63.gif">
回复

收藏 举报

oufuqiang 发表于 2008-10-14 11:04 | 显示全部楼层

IV转换应用于电流互感器

<br /><a href="http://www.marcspages.co.uk/tech/ctcombin.htm" target=_blank>http://www.marcspages.co.uk/tech/ctcombin.htm</a>
回复

收藏 举报

oufuqiang 发表于 2008-10-14 11:33 | 显示全部楼层

OPAMP的几种应用

页面简陋了点，不过内容不错的。<br /><a href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/opampvar.html#c1" target=_blank>http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/opampvar.html#c1</a>
回复

收藏 举报

jonsun 发表于 2008-10-14 11:33 | 显示全部楼层

简单处理

勺子上嵌入一个非接触式ID卡，盘子上装一个读卡器及逻辑电路，当勺子不停动时，读卡器就不停的读卡，用逻辑电路驱动音乐芯片启动；当勺子放在盘子上时，读卡器只读一次卡，逻辑电路不动作，音乐不播放；当勺子远离盘子时，读卡器不读卡，逻辑电路也不动作，同样音乐也不播放。<br />同时，非接触ID卡可以做成多种形式的，可以安装到勺子上。
回复

收藏 举报

 楼主| doob 发表于 2008-10-14 11:45 | 显示全部楼层

谢谢

oufuqiang：<br />&nbsp;&nbsp;谢谢，很全，很实用！<br />jonsun：<br />&nbsp;&nbsp;谢谢，&nbsp;很贵，不划算！
回复

收藏 举报

zhaoyingf 发表于 2008-10-14 11:51 | 显示全部楼层

LZ你搞机器人吗

LZ你搞机器人吗
回复

收藏 举报

l30439129 发表于 2008-10-15 08:47 | 显示全部楼层

re

不闲大的话，弄几个干簧管上去。只要分布合理，应该可以满足你的要求。
回复

收藏 举报

 楼主| doob 发表于 2008-10-15 09:21 | 显示全部楼层

hi

zhaoyingf:<br />&nbsp;LZ你搞机器人吗?<br /><br />&nbsp;doob：不搞，简单玩具而已。。。<br /><br />l30439129：不闲大的话，弄几个干簧管上去。只要分布合理，<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;应该可以满足你的要求。<br />&nbsp;doob：试过干簧管，距离也是很短，满足不了！<br />
回复

收藏 举报

tjmcu 发表于 2008-10-15 13:37 | 显示全部楼层

学习

  
回复

收藏 举报

cos12a 发表于 2008-10-15 21:44 | 显示全部楼层

试试CAP sensor

试试CAP&nbsp;sensor<br /><br />不光金属上去感应,用手去抓也感应得到.<br />也便宜,最多两块钱.
回复

收藏 举报

sinanjj 发表于 2008-10-15 22:39 | 显示全部楼层

重申我的观点

把一排红外对管装碗沿上,&nbsp;形成一排对射红外线.&nbsp;碗里用线圈.&nbsp;多条件检测.&nbsp;<br /><br />这样距离可以到碗口了.&nbsp;也可测量运动<br /><br />不知LZ要距离多远<br /><br />
回复

收藏 举报

dragon_hn 发表于 2008-10-16 03:39 | 显示全部楼层

估计chunyang和computer00都不忍心看这帖子了

估计chunyang和computer00都不忍心看这帖子了。<br />自己不想手工绕线圈就拆个非接触式IC卡的线圈借来用用，50楼也死不瞑目。<br />交流问题却老是想着用直流放大器来解决，就不会想到用交流放大器或是仪表放大器么。
回复

收藏 举报

computer00 发表于 2008-10-16 08:51 | 显示全部楼层

搞三个线圈，互相垂直安装，不管你勺子怎么运动都能感应

线圈搞多一点，在几十cm的范围内，产生几十mV的电压肯定是很容易的。
回复

收藏 举报

equator 发表于 2008-10-17 09:50 | 显示全部楼层

使用感应按键的原理

可以使用感应按键的原理，是一个震荡电路，手触摸时相当于电容变化，然后检测点电压变化，用AD转换。盘子和勺子上各有一个铁片，勺子放在盘子里时，电容变大，引起某点分压变化。
回复

收藏 举报

菜老大 发表于 2008-10-17 09:56 | 显示全部楼层

试试红外

发射红外线然后测量回波时间得到距离。&nbsp;通过距离判断是否开启音乐。<br /><br />
回复

收藏 举报

oufuqiang 发表于 2008-10-17 21:44 | 显示全部楼层

呵呵，越弄越复杂

  
回复

收藏 举报

下一页 »
12345下一页
返回列表 发新帖
高级模式
B Color Image Link Quote Code Smilies
您需要登录后才可以回帖 登录 | 注册

本版积分规则

快速回复 在线客服 返回列表 返回顶部