Continuity tester using android phone


1.Android Phone

2. 3.5mm jack or old headphone with mic

3. wire (multimeter probes is better)



Step 1: Cut the Headphone

Step 2: Find the MIC and GND Wires

Step 3: Connect 3K Resistor Parallel to the MIC and GND

Connect 3K resistor parallel to the MIC and GND and connect the probes wire and solder it.

Step 4: Finally Insulate the Wires

Step 5: Install Application to the Phone

click to install app


Step 6: Testing.

click here to see the video


Step 7: Don't Check Charged Components

<p>How do you read the voltage on microfone input? </p>
<p>using multimeter</p>
<p>Nice joke! How do you read from Android, from your cell phone? I don't think that your cell phone display messages based on multimeter measuring. You know what i mean. Apologise for my english. </p>
<p>Use the mic key event .</p>
I'm a very beginner. I need just to find how to do it - few lines of code, in my opinion. I plan to use this in an educational program, using Rfo basic - don't have other Android programming knowledge. This is my last message. If you really want to help me, I thank you in advance. Sorry for inconvenience.
<p>MainActivity.java</p><p>package com.topstarcreations.continuitytestersample;</p><p>import android.app.Activity;</p><p>import android.os.Bundle;</p><p>import android.view.KeyEvent;</p><p>import android.widget.TextView;</p><p>public class MainActivity extends Activity {</p><p>TextView valueChange;</p><p>@Override</p><p>protected void onCreate(Bundle savedInstanceState) {</p><p>super.onCreate(savedInstanceState);</p><p>setContentView(R.layout.activity_main);</p><p>valueChange = (TextView)findViewById(R.id.textView1);</p><p>}</p><p> @Override</p><p>public boolean onKeyDown(int keyCode, KeyEvent event) {</p><p>switch (keyCode) {</p><p>case KeyEvent.KEYCODE_HEADSETHOOK:</p><p>event.startTracking();</p><p>valueChange.setText(&quot;1&quot;);</p><p>return true;</p><p>}</p><p>return super.onKeyDown(keyCode, event);</p><p> }</p><p> @Override</p><p>public boolean onKeyUp(int keyCode, KeyEvent event) {</p><p>switch (keyCode) {</p><p>case KeyEvent.KEYCODE_HEADSETHOOK:</p><p>event.startTracking();</p><p>valueChange.setText(&quot;0&quot;);</p><p>return true;</p><p>}</p><p>return super.onKeyUp(keyCode, event);</p><p> }</p><p> // catches the long press button event (longer than 2 seconds)</p><p> @Override</p><p> public boolean onKeyLongPress(int keyCode, KeyEvent event) { </p><p> return true;</p><p> }</p><p>}</p>
<p>Many thanks!</p>
<p>This is the Output </p>
<p>activity_main.xml</p><p>&lt;RelativeLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;</p><p> xmlns:tools=&quot;http://schemas.android.com/tools&quot;</p><p> android:layout_width=&quot;match_parent&quot;</p><p> android:layout_height=&quot;match_parent&quot;</p><p> android:paddingBottom=&quot;@dimen/activity_vertical_margin&quot;</p><p> android:paddingLeft=&quot;@dimen/activity_horizontal_margin&quot;</p><p> android:paddingRight=&quot;@dimen/activity_horizontal_margin&quot;</p><p> android:paddingTop=&quot;@dimen/activity_vertical_margin&quot;</p><p> tools:context=&quot;.MainActivity&quot; &gt;</p><p> &lt;TextView</p><p> android:id=&quot;@+id/textView1&quot;</p><p> android:layout_width=&quot;wrap_content&quot;</p><p> android:layout_height=&quot;wrap_content&quot;</p><p> android:layout_centerHorizontal=&quot;true&quot;</p><p> android:layout_centerVertical=&quot;true&quot;</p><p> android:text=&quot;0&quot; </p><p> android:textSize=&quot;100sp&quot;/&gt;</p><p>&lt;/RelativeLayout&gt;</p>
<p>aahh good idea but how to connect them i have this 3.3 mm jack like you exactly but i dont know what the color that i should connect with 3k resistoris </p>
<p>Use GOLD and RED.</p>
<p>Use GOLD and RED.</p>
<p>Use GOLD and RED.</p>
What fusing on the leads should I use to protect the phone against inadvertently placing across mains voltage?
if you don't know for 100% whether or not what you're working on is hot or not, than you shouldn't be working on it bro.
<p>Don't check the charged components. no fusing. </p>
<p>Cool project. I really want to do but I can't do it now, because my phone had died. :/</p>
<p>you probably tested a condutor with voltage</p>
Not a bad idea but as a technician in my past trade and current hobby, I will always relay on my trusted Fluke meters. Perhaps Fluke will come out with one (unless they one already)
They do, although it is a Bluetooth interface for the 287/289 series multimeter. The actual measurement is done by the multimeter and it is sent to the phone via the accessory. Just for the sake of it, I own a 289 and I just love it, after a 179 and 115 series. If not the best portable meters surely in the top three.
I love this instructable. I can't wait for full multimeter modules to be available for smartphones.
<p>something like <a href="http://new.voltset.com/" rel="nofollow">this</a> ?</p><p>I have multimeters in just about every tool box, and car (at least 6 or 7, spread about), but my smartphone is almost always on my hip. Between datalogging, and reduction in size, I am right there with you, in the &quot;can't wait&quot; group.</p>
<p>thank you sir.</p>
<p>Great idea! Having a continuity tester in your phone is much better than having to carrying around a multimeter all the time. </p>
<p>thank you sir.</p>
<p>what watt or volts are the 3k ohm resistor?</p>
<p>across the resistance below 0.5V</p>
<p>i like this and need one for my ground to antenna checking continuity...excellent might try to make myself...</p>
Love the idea. Simple and easy to use. Do add a warning to remove any power from the circuit you are testing and make sure all capacitors are discharged, as your costly phone is at stake.
Thanks.. yes you are right.<br><br>I will surely add a warning.

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