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    <title>Mojang Studios Jira</title>
    <link>https://bugs.mojang.com</link>
    <description>This file is an XML representation of an issue</description>
    <language>en</language>    <build-info>
        <version>9.12.2</version>
        <build-number>9120002</build-number>
        <build-date>10-01-2024</build-date>
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<item>
            <title>[MCPE-14791] Comparators don&apos;t activate when they&apos;re getting power from detector rails</title>
                <link>https://bugs.mojang.com/browse/MCPE-14791</link>
                <project id="10200" key="MCPE">Minecraft (Bedrock codebase)</project>
                    <description>&lt;p&gt;My device = Kingzone K1 turbo&lt;/p&gt;

&lt;p&gt;I exspected that the comparator&apos; back is shining AND the comparator makes a redstone signal.&lt;/p&gt;

&lt;p&gt;I saw the comparator was not activated, even it did not make a redstone-signal, normally the comparator should do this!&lt;/p&gt;

&lt;p&gt;How to reproduce:&lt;br/&gt;
1. Place a comparator&lt;br/&gt;
2. Place a detector rail as a redstone-power-source at his back&lt;br/&gt;
3. Place any type of minecart on it&lt;br/&gt;
4. You will see, the comparator is not making anything&lt;/p&gt;

&lt;p&gt;&lt;del&gt;UPDATE: As of 0.16.1, this bug is only partially fixed: Comparators can receive power from redstone dust that is powered by a detector rail, but they cannot recieve power directly from the detector rail. Sometimes, however, placing a comparator next to a detector rail will cause it to be momentarily powered when it is first placed, giving off a pulse of at least 1.5 rticks (3 gameticks), or however long a pulse is required to be in order to invert a redstone torch in MCPE. See this video for a demonstration: youtu.be/9E4gOTQ4W7c&lt;/del&gt;&lt;/p&gt;</description>
            <key id="142408">MCPE-14791</key>
            <summary>Comparators don&apos;t activate when they&apos;re getting power from detector rails</summary>
                <type id="1" iconUrl="https://bugs.mojang.com/secure/viewavatar?size=xsmall&amp;avatarId=18903&amp;avatarType=issuetype">Bug</type>
                                    <status id="5" iconUrl="https://bugs.mojang.com/images/icons/statuses/resolved.png" description="A resolution has been taken, and it is awaiting verification by reporter. From here issues are either reopened, or are closed.">Resolved</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="1">Fixed</resolution>
                                            <reporter username="uduster">Daniel R.</reporter>
                        <labels>
                            <label>detector-rail</label>
                            <label>redstone</label>
                            <label>redstone-comparator</label>
                    </labels>
                <created>Sat, 4 Jun 2016 16:17:28 +0200</created>
                <updated>Sun, 19 Mar 2017 06:11:44 +0100</updated>
                            <resolved>Sun, 6 Nov 2016 12:40:53 +0100</resolved>
                                    <version>0.14.3</version>
                    <version>0.15.0 Beta build 1</version>
                    <version>0.15.0 Beta build 2</version>
                    <version>0.15.0 Beta build 3</version>
                    <version>0.15.0</version>
                    <version>0.15.1 Beta 1</version>
                    <version>0.15.1</version>
                    <version>0.15.2</version>
                    <version>0.15.3</version>
                    <version>0.15.6</version>
                    <version>0.15.90.0</version>
                    <version>0.15.7</version>
                    <version>0.15.90.1</version>
                    <version>0.15.90.2</version>
                    <version>0.15.8</version>
                    <version>0.15.90.7</version>
                    <version>0.16.0</version>
                                    <fixVersion>0.16.1</fixVersion>
                                                        <votes>3</votes>
                                    <watches>7</watches>
                                                                            <comments>
                            <comment id="341061" author="zebulanstanphill@gmail.com" created="Sun, 6 Nov 2016 12:40:53 +0100"  >&lt;p&gt;&lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=DrAwesome4333&quot; class=&quot;user-hover&quot; rel=&quot;DrAwesome4333&quot;&gt;DrAwesome4333&lt;/a&gt; You&apos;re right. My mistake. I&apos;ll close this issue as fixed now. However, the occasional short pulse the comparator gives off when initially placed sometimes is still a bug, and I&apos;ve reported that in a new ticket as &lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-18008&quot; title=&quot;When placed adjacent to a detector rail with a minecart on top, a comparator sometimes gives off a short pulse&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MCPE-18008&quot;&gt;&lt;del&gt;MCPE-18008&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="340687" author="drawesome4333" created="Sun, 6 Nov 2016 06:52:06 +0100"  >&lt;p&gt;Isn&apos;t this fixed now ?&lt;br/&gt;
When a comparator is next to  detector rail it will measure the contents in the mine cart. Fill a minecart with chest witn some items and it works. So the &quot;half not fixed&quot; part is WAI.&lt;br/&gt;
This image from the the wiki shows the correct results&lt;br/&gt;
&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;a id=&quot;127839_thumb&quot; href=&quot;https://bugs.mojang.com/secure/attachment/127839/127839_300px-Detector-comparator-diff.png&quot; title=&quot;300px-Detector-comparator-diff.png&quot; file-preview-type=&quot;image&quot; file-preview-id=&quot;127839&quot; file-preview-title=&quot;300px-Detector-comparator-diff.png&quot;&gt;&lt;img src=&quot;https://bugs.mojang.com/secure/thumbnail/127839/_thumb_127839.png&quot; style=&quot;border: 0px solid black&quot; role=&quot;presentation&quot;/&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;</comment>
                            <comment id="340507" author="zebulanstanphill@gmail.com" created="Sat, 5 Nov 2016 15:21:09 +0100"  >&lt;p&gt;&lt;del&gt;As of 0.16.1, this bug is only partially fixed: Comparators can receive power from redstone dust that is powered by a detector rail, but they cannot recieve power directly from the detector rail. Sometimes, however, placing a comparator next to a detector rail will cause it to be momentarily powered when it is first placed, giving off a pulse of at least 1.5 rticks (3 gameticks), or however long a pulse is required to be in order to invert a redstone torch in MCPE. See the newly attached screenshot. I will make a video on this shortly.&lt;/del&gt;&lt;/p&gt;

&lt;p&gt;Nevermind, I&apos;m stupid. This is WAI. &lt;img class=&quot;emoticon&quot; src=&quot;https://bugs.mojang.com/images/icons/emoticons/tongue.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt; (Except the pulse that sometimes happens... but that should be a separate report.)&lt;/p&gt;</comment>
                            <comment id="315759" author="uduster" created="Wed, 22 Jun 2016 14:44:52 +0200"  >&lt;p&gt;I updated the description to correct some grammar and spelling errors to prevent misunderstandings. Also I have added some labels.&lt;/p&gt;</comment>
                            <comment id="311097" author="depressed-pho" created="Tue, 7 Jun 2016 06:29:52 +0200"  >&lt;p&gt;Thanks. I updated the summary to clarify the point.&lt;/p&gt;</comment>
                            <comment id="310993" author="uduster" created="Mon, 6 Jun 2016 21:31:54 +0200"  >&lt;p&gt;I updated the description for detector rails only, as I tested it with other power sources myself and the comparator worked as it should work. So the problem is only with detector rails.&lt;/p&gt;</comment>
                            <comment id="310434" author="depressed-pho" created="Sun, 5 Jun 2016 04:23:48 +0200"  >&lt;p&gt;I don&apos;t know about 0.15.0 beta but in 0.14.3 this only happens when the power source of a comparator is a detector rail with any kind of minecarts on top of it.&lt;/p&gt;</comment>
                            <comment id="310198" author="kaleb418" created="Sat, 4 Jun 2016 16:26:04 +0200"  >&lt;p&gt;Confirmed for 0.14.3&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="127839" name="300px-Detector-comparator-diff.png" size="90505" author="DrAwesome4333" created="Sun, 6 Nov 2016 06:51:00 +0100"/>
                            <attachment id="127799" name="Comparator-Detector-Rail-Bug-0.16.1.png" size="345025" author="SuperGeniusZeb" created="Sat, 5 Nov 2016 15:21:09 +0100"/>
                            <attachment id="118618" name="with_redstone_signal.png" size="976381" author="uduster" created="Sat, 4 Jun 2016 16:17:28 +0200"/>
                            <attachment id="118617" name="without_redstone_signal.png" size="1076727" author="uduster" created="Sat, 4 Jun 2016 16:17:28 +0200"/>
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