tag:blogger.com,1999:blog-20639513986967842222024-03-06T01:17:21.702-08:00 tech.ideasAnonymoushttp://www.blogger.com/profile/14984335641477683770noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-2063951398696784222.post-53278694658683601002016-04-19T09:27:00.002-07:002016-04-19T09:46:12.726-07:00adapting am radio metal detector to arduino board<!--[if gte mso 9]><xml>
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<br />
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<cite><span style="font-family: "calibri" , "sans-serif"; mso-ascii-theme-font: minor-latin; mso-bidi-font-family: Arial; mso-bidi-theme-font: minor-bidi; mso-hansi-theme-font: minor-latin;">I have seen on the net simple metal
detector circuit which you can build yourself in 20 mint. See link <a href="http://www.talkingelectronics.com/html/MetalDetector.html"><span style="font-style: normal;">www.talkingelectronics.com/html/</span><b><span style="font-style: normal;">MetalDetector</span></b><span style="font-style: normal;">.html</span></a>
to make clear to my last post, I used this ciruit and adapt it to arduino board
to make arduino metal detector see vedio<span style="mso-spacerun: yes;">
</span></span></cite><span style="font-size: 12.0pt; line-height: 115%;"><a href="https://www.youtube.com/watch?v=1Vw4EAmZyls">https://www.youtube.com/watch?v=1Vw4EAmZyls</a><span style="mso-spacerun: yes;"> </span>use the same sketch as befor-</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">//
Arduino based metal detector</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0in; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt;">
<span style="font-family: "courier new"; font-size: 10.0pt;">//
(C)Dzl july 2013</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0in; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt;">
<span style="font-family: "courier new"; font-size: 10.0pt;">//
http://dzlsevilgeniuslair.blogspot.dk/</span></div>
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<br /></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">//
Connect search coil oscillator (20-200kHz) to pin 5</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">//
Connect piezo between pin 13 and GND</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0in; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt;">
<span style="font-family: "courier new"; font-size: 10.0pt;">//
Connect NULL button between pin 12 anf GND</span></div>
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<br /></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">//
REMEMBER TO PRESS NULL BUTTON AFTER POWER UP!!</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">#define
SET(x,y) (x |=(1<<y))<span style="mso-tab-count: 2;"> </span><span style="mso-spacerun: yes;"> </span>//-Bit set/clear macros</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">#define
CLR(x,y) (x &= (~(1<<y)))<span style="mso-spacerun: yes;">
</span><span style="mso-tab-count: 1;"> </span>// |</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">#define
CHK(x,y) (x & (1<<y))<span style="mso-spacerun: yes;">
</span><span style="mso-tab-count: 1;"> </span>// |</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">#define
TOG(x,y) (x^=(1<<y))<span style="mso-spacerun: yes;"> </span><span style="mso-tab-count: 1;"> </span>//-+</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">unsigned
long t0=0;<span style="mso-spacerun: yes;"> </span>//-Last time</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">int
t=0;<span style="mso-spacerun: yes;"> </span>//-time between
ints</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">unsigned
char tflag=0;<span style="mso-spacerun: yes;"> </span>//-Measurement ready
flag</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">float
SENSITIVITY= 1000.0;<span style="mso-spacerun: yes;"> </span>//-Guess what</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">//-Generate
interrupt every 1000 oscillations of the search coil</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">SIGNAL(TIMER1_COMPA_vect)</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">{</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>OCR1A+=1000;</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>t=micros()-t0;</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>t0+=t;</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>tflag=1;</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">}</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">void
setup()</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">{</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>pinMode(13,OUTPUT);<span style="mso-spacerun: yes;"> </span>//-piezo pin</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>digitalWrite(12,HIGH); //-NULL SW. pull up</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>//-Set up counter1 to count at pin 5</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>TCCR1A=0;</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>TCCR1B=0x07;</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>SET(TIMSK1,OCF1A);</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">}</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">//-Float
ABS</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">float
absf(float f)</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">{</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>if(f<0.0)</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>return -f;</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>else</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>return f;</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">}</span></div>
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<br /></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">int<span style="mso-spacerun: yes;"> </span>v0=0;<span style="mso-spacerun: yes;">
</span>//-NULL value</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">float
f=0; <span style="mso-spacerun: yes;"> </span>//-Measurement value</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">unsigned
int FTW=0;<span style="mso-spacerun: yes;"> </span>//-Click generator rate</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">unsigned
int PCW=0;<span style="mso-spacerun: yes;"> </span>//-Click generator phase</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">unsigned
long timer=0; //-Click timer</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">void
loop()</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">{</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>if(tflag)</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>{</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>if(digitalRead(12)==LOW)<span style="mso-spacerun: yes;"> </span>//-Check NULL SW.</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>v0=t;<span style="mso-spacerun: yes;"> </span><span style="mso-spacerun: yes;"> </span>//-Sample new null value</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>f=f*0.9+absf(t-v0)*0.1;<span style="mso-spacerun: yes;"> </span>//-Running average over 10 samples</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>tflag=0;<span style="mso-spacerun: yes;"> </span>//-Reset flag</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0in; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt;">
<br /></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>float clf=f*SENSITIVITY;<span style="mso-spacerun: yes;"> </span>//-Convert measurement to click frequency</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>if(clf>10000)<span style="mso-spacerun: yes;"> </span></span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>clf=10000;</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>FTW=clf;</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>}</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span></span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>//-Click generator</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>if(millis()>timer)</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>{</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>timer+=10;</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>PCW+=FTW;</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>if(PCW&0x8000)</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>{</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>digitalWrite(13,HIGH);</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>PCW&=0x7fff; </span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>}</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>else</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>digitalWrite(13,LOW);</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;"><span style="mso-spacerun: yes;"> </span>}</span></div>
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<span style="font-family: "courier new"; font-size: 10.0pt;">}</span></div>
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<br /></div>
<div class="MsoNormal">
<span style="font-size: 16.0pt; line-height: 115%;">It does not
detect gold, only metals.</span></div>
Anonymoushttp://www.blogger.com/profile/14984335641477683770noreply@blogger.com0tag:blogger.com,1999:blog-2063951398696784222.post-20774496546076585402016-04-17T23:54:00.001-07:002016-04-17T23:54:09.920-07:00arduino metal detector<iframe allowfullscreen="" frameborder="0" height="344" src="https://www.youtube.com/embed/videoseries?list=PLst8DG2-35Q2x1k9el0XLWuat9hTeYWPg" width="425"></iframe>Anonymoushttp://www.blogger.com/profile/14984335641477683770noreply@blogger.com0tag:blogger.com,1999:blog-2063951398696784222.post-9108958340844138682016-04-17T14:59:00.002-07:002016-04-17T14:59:58.318-07:00Arduino metal detector<!--[if !mso]>
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<div class="MsoNormal">
<i><span style="font-size: 16.0pt; line-height: 115%;">Arduino metal
detector</span></i></div>
<div class="MsoNormal">
<span style="font-size: 16.0pt; line-height: 115%;">I have seen
arduino metal detector circuit on net. see circuit<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9D2JGos98LyI9MQwMHxyWRO_qIFGfIdbpDN4ztPmdy8Mx3R7V_LZtcX9ShPY_rI1NRFcm4yeFX_hKWRsCATDIUfkAgZ5hf_UR_K7zsr8NnsoyvIJ0dvlI1sB3b_oczv75zoXzdtro2Jo/s1600/IMG_20130722_202500.jpg" imageanchor="1"><img border="0" height="150" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9D2JGos98LyI9MQwMHxyWRO_qIFGfIdbpDN4ztPmdy8Mx3R7V_LZtcX9ShPY_rI1NRFcm4yeFX_hKWRsCATDIUfkAgZ5hf_UR_K7zsr8NnsoyvIJ0dvlI1sB3b_oczv75zoXzdtro2Jo/s200/IMG_20130722_202500.jpg" width="200" /></a><span style="mso-no-proof: yes;"></span></span></div>
<div class="MsoNormal">
<span style="font-size: 16.0pt; line-height: 115%;">And see
sketch cod:</span><span style="font-size: 12.0pt; line-height: 115%;"> https://dl.dropboxusercontent.com/u/2248531/blog/metal_detector/metal_detector.ino</span></div>
<div class="MsoNormal">
<span style="font-size: 14.0pt; line-height: 115%;">I have tried
it on my arduino Uno r3 at mega 328 r-b ,it did not work. When up</span></div>
<div class="MsoNormal">
<span style="font-size: 14.0pt; line-height: 115%;">loading
sketch (library found not working).some did work for them, some are not.</span></div>
<div class="MsoNormal">
<span style="font-size: 14.0pt; line-height: 115%;">To check if
my circuit correct and working</span></div>
<div class="MsoNormal">
<span style="font-size: 14.0pt; line-height: 115%;"><span style="mso-spacerun: yes;"> </span>I checked circuit by powering it with 9 v
battery near am radio and moved piece of metal over the coil, radio responding
to metal movement. <span style="mso-spacerun: yes;"> </span></span></div>
<div class="MsoNormal">
<span style="font-size: 14.0pt; line-height: 115%;">I think the
reason was the timers.</span></div>
<div class="MsoNormal">
<span style="font-size: 14.0pt; line-height: 115%;">He mentioned
</span>oscillator circuit feeds at around 160kHz signal to pin 5 of the Arduino</div>
<div class="MsoNormal">
So checking if reason not working was timers of my arduino, I
choose similar circuit with less kHz pulsing and it was am radio blf metal
detector oscillator feeds 120 kHz. See circuit</div>
<div class="MsoNormal">
<span style="font-size: 14.0pt; line-height: 115%; mso-no-proof: yes;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6h9lx3-7pboovieOdls5enw7o2rouNbn8Mo9_mcOrw4KMHXjkwQu_86O6PyWnUgQgttRgJ0EQ8U6u6DLeVxOOhqIl8A4jwz2kHkaOFmzd5K9p0Tp9_foUpI2F2vwoHOqPgzONltDKWfA/s1600/scan0001.jpg" imageanchor="1"><img border="0" height="276" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6h9lx3-7pboovieOdls5enw7o2rouNbn8Mo9_mcOrw4KMHXjkwQu_86O6PyWnUgQgttRgJ0EQ8U6u6DLeVxOOhqIl8A4jwz2kHkaOFmzd5K9p0Tp9_foUpI2F2vwoHOqPgzONltDKWfA/s320/scan0001.jpg" width="320" /></a></span><span style="font-size: 14.0pt; line-height: 115%;"></span></div>
<div class="MsoNormal">
<span style="font-size: 14.0pt; line-height: 115%;">And to make
it work on my arduino with same code sketch, I just connected a wire from
transistor E side to arduino pin 5 digital and reload same sketch and that is
it, it worked. See modified sketch</span></div>
<div class="MsoNormal">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhOdEV4Rh9T2QCW4NwiJvc5lSnRbGMNHE9Twc2n3YZf3T5XkMzfOSqWnvOhhxzK0plxhebKa0oTL64dpJhAQiVoMwfayKV1iOcuRvbZMj44CeIJ4cfzSNeZLcuCxHllI9QEW6mjnWfl3jM/s1600/scan0002.jpg" imageanchor="1"><img border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhOdEV4Rh9T2QCW4NwiJvc5lSnRbGMNHE9Twc2n3YZf3T5XkMzfOSqWnvOhhxzK0plxhebKa0oTL64dpJhAQiVoMwfayKV1iOcuRvbZMj44CeIJ4cfzSNeZLcuCxHllI9QEW6mjnWfl3jM/s200/scan0002.jpg" width="200" /></a><span style="font-size: 14.0pt; line-height: 115%; mso-no-proof: yes;"><br /></span><span style="font-size: 14.0pt; line-height: 115%;"></span></div>
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