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<a href="../../Hardware.html">Hardware</a> / <a href="./Bricklets.html">Bricklets</a> / LCD 20x4 Bricklet
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  <div class="section" id="lcd-20x4-bricklet">
<span id="id1"></span><h1>LCD 20x4 Bricklet<a class="headerlink" href="#lcd-20x4-bricklet" title="Permalink to this headline">¶</a></h1>
{% from "macros.html" import tfdocstart, tfdocimg, tfdocend %}
{{
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               "Bricklets/bricklet_lcd12_20x4_tilted_600.jpg",
               "LCD 20x4 Bricklet")
}}
{{
    tfdocimg("Bricklets/bricklet_lcd12_20x4_top_100.jpg",
             "Bricklets/bricklet_lcd12_20x4_top_600.jpg",
             "LCD 20x4 Bricklet")
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{{
    tfdocimg("Bricklets/bricklet_lcd_20x4_display_100.jpg",
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             "LCD 20x4 Bricklet")
}}
{{
    tfdocimg("Bricklets/bricklet_lcd_20x4_master_100.jpg",
             "Bricklets/bricklet_lcd_20x4_master_600.jpg",
             "LCD 20x4 Bricklet with Master Brick")
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{{
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             "Cases/bricklet_lcd_20x4_case_600.jpg",
             "LCD 20x4 Bricklet in Case")
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{{
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             "Dimensions/lcd_20x4_bricklet_dimensions_600.png",
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}}
{{ tfdocend() }}<div class="section" id="features">
<h2>Features<a class="headerlink" href="#features" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>20x4 character alphanumeric display</li>
<li>Switchable blue backlight</li>
<li>4 push-buttons</li>
</ul>
</div>
<div class="section" id="description">
<span id="lcd-20x4-bricklet-description"></span><h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
<p>This LCD <a class="reference internal" href="../../Primer.html#primer-bricklets">Bricklet</a> is equipped with a
20x4 character alphanumeric display with blue backlight and four push-buttons.
It can be controlled with <a class="reference internal" href="../../Primer.html#primer-bricks">Bricks</a>.
The API allows to write characters to the LCD, get the state of the buttons,
switch the backlight on or off and configure events for the buttons.</p>
<p>You can use this Bricklet to display text, for example a name of
a song that is played on your PC or measurements from other Bricklets.</p>
</div>
<div class="section" id="technical-specifications">
<h2>Technical Specifications<a class="headerlink" href="#technical-specifications" title="Permalink to this headline">¶</a></h2>
<table border="1" class="docutils">
<colgroup>
<col width="37%" />
<col width="63%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Property</th>
<th class="head">Value</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>LCD</td>
<td>Alphanumeric, 20 chars per line, 4 lines</td>
</tr>
<tr class="row-odd"><td>Current Consumption with Backlight</td>
<td>36mA</td>
</tr>
<tr class="row-even"><td>&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr class="row-odd"><td>Backlight</td>
<td>Blue, software switchable</td>
</tr>
<tr class="row-even"><td>Contrast</td>
<td>Adjustable with potentiometer</td>
</tr>
<tr class="row-odd"><td>&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr class="row-even"><td>Dimensions (W x D x H)</td>
<td>60 x 98 x 22mm (2.36 x 3.86 x 0.86&quot;)*</td>
</tr>
<tr class="row-odd"><td>Weight</td>
<td>96g*</td>
</tr>
</tbody>
</table>
<p>* without screws</p>
</div>
<div class="section" id="resources">
<h2>Resources<a class="headerlink" href="#resources" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>LCD charset (<a class="reference external" href="https://github.com/Tinkerforge/lcd-20x4-bricklet/raw/master/datasheets/standard_charset.pdf">Download</a>)</li>
<li>KS0066U datasheet (<a class="reference external" href="https://github.com/Tinkerforge/lcd-20x4-bricklet/raw/master/datasheets/KS0066u.pdf">Download</a>)</li>
<li>MCP23017 datasheet (<a class="reference external" href="https://github.com/Tinkerforge/lcd-20x4-bricklet/raw/master/datasheets/MCP23017.pdf">Download</a>)</li>
<li>Schematic (<a class="reference external" href="https://github.com/Tinkerforge/lcd-20x4-bricklet/raw/master/hardware/lcd-20x4-schematic.pdf">Download</a>)</li>
<li>Outline and drilling plan (<a class="reference external" href="../../_images/Dimensions/lcd_20x4_bricklet_dimensions.png">Download</a>)</li>
<li>Source code and design files (<a class="reference external" href="https://github.com/Tinkerforge/lcd-20x4-bricklet/zipball/master">Download</a>)</li>
</ul>
</div>
<div class="section" id="test-your-lcd-20x4-bricklet">
<span id="lcd-20x4-bricklet-test"></span><h2>Test your LCD 20x4 Bricklet<a class="headerlink" href="#test-your-lcd-20x4-bricklet" title="Permalink to this headline">¶</a></h2>
<p>To test a LCD 20x4 Bricklet you need to have <a class="reference internal" href="../../Software/Brickd.html#brickd">Brick Daemon</a> and
<a class="reference internal" href="../../Software/Brickv.html#brickv">Brick Viewer</a> installed. Brick Daemon acts as a proxy between
the USB interface of the Bricks and the API bindings. Brick Viewer connects
to Brick Daemon. It helps to figure out basic information about the connected
Bricks and Bricklets and allows to test them.</p>
<p>Connect the LCD 20x4 Bricklet to a <a class="reference internal" href="../../Primer.html#primer-bricks">Brick</a>
with a Bricklet Cable (see picture below).</p>
<a class="reference external image-reference" href="../../_images/Bricklets/bricklet_lcd_20x4_master_1200.jpg"><img alt="LCD 20x4 Bricklet connected to Master Brick" class="align-center" src="../../_images/bricklet_lcd_20x4_master_600.jpg" style="width: 600.0px; height: 572.0px;" /></a>
<p>If you connect the Brick to the PC over USB, you should see a new tab named
&quot;LCD 20x4 Bricklet&quot; in the Brick Viewer after a moment. Select this tab.
If everything went as expected the Brick Viewer should look as
depicted below.</p>
<a class="reference external image-reference" href="../../_images/Bricklets/bricklet_lcd_20x4_brickv.jpg"><img alt="LCD 20x4 Bricklet in Brick Viewer" class="align-center" src="../../_images/bricklet_lcd_20x4_brickv.jpg" style="width: 466.0px; height: 298.0px;" /></a>
<p>Input a string into the text field.
You can choose the line and the start position at which the text is displayed.
Press &quot;Send Text&quot; to display it. Press &quot;Backlight On&quot; to turn the backlight on.
Play around with the four on-board buttons and look how their values change.</p>
<p>After this test you can go on with writing your own application.
See the <a class="reference internal" href="#lcd-20x4-bricklet-programming-interface">Programming Interface</a>
section for the API of the LCD 20x4 Bricklet and examples in different programming
languages.</p>
</div>
<div class="section" id="change-lcd-s-contrast">
<h2>Change LCD's contrast<a class="headerlink" href="#change-lcd-s-contrast" title="Permalink to this headline">¶</a></h2>
<p>To modify the contrast you have to
turn the potentiometer on the Bricklet with a screwdriver.
The potentiometer is attached next to the Bricklet connector.</p>
</div>
<div class="section" id="attach-external-buttons">
<h2>Attach external Buttons<a class="headerlink" href="#attach-external-buttons" title="Permalink to this headline">¶</a></h2>
<p>The LCD Bricklet can be equipped with a pin header on the right hand side.
To attach a switch or a button you have to connect on pin
with one input (BTN0 to BTN3) and the other with GND.</p>
</div>
<div class="section" id="case">
<span id="lcd-20x4-bricklet-case"></span><h2>Case<a class="headerlink" href="#case" title="Permalink to this headline">¶</a></h2>
<p>A <a class="reference external" href="https://www.tinkerforge.com/en/shop/cases/case-lcd20x4-bricklet.html">laser-cut case for the LCD 20x4 Bricklet</a> is available.</p>
<a class="reference external image-reference" href="../../_images/Cases/bricklet_lcd_20x4_case_1000.jpg"><img alt="Case for LCD 20x4 Bricklet" class="align-center" src="../../_images/bricklet_lcd_20x4_case_350.jpg" style="width: 350.0px; height: 295.0px;" /></a>
<p>The assembly is easiest if you follow the following steps:</p>
<ul class="simple">
<li>Screw LCD to top plate with spacers (10mm) at the bottom and long screws from the top,</li>
<li>screw Bricklet to LCD with spacers (12mm),</li>
<li>build up side plates,</li>
<li>add button extensions to side plate,</li>
<li>plug side plates into top plate and</li>
<li>screw bottom plate to bottom spacers.</li>
</ul>
<p>Below you can see an exploded assembly drawing of the LCD 20x4 Bricklet case:</p>
<a class="reference external image-reference" href="../../_images/Exploded/lcd20x4_exploded.png"><img alt="Explosionszeichnung für LCD 20x4 Bricklet" class="align-center" src="../../_images/lcd20x4_exploded_350.png" style="width: 350.0px; height: 285.0px;" /></a>
<p>Hint: There is a protective film on both sides of the plates,
you have to remove it before assembly.</p>
</div>
<div class="section" id="programming-interface">
<span id="lcd-20x4-bricklet-programming-interface"></span><h2>Programming Interface<a class="headerlink" href="#programming-interface" title="Permalink to this headline">¶</a></h2>
<p>See <a class="reference internal" href="../../Programming_Interface.html#programming-interface">Programming Interface</a> for a detailed description.</p>
<table border="1" class="docutils">
<colgroup>
<col width="45%" />
<col width="18%" />
<col width="18%" />
<col width="18%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Language</th>
<th class="head">API</th>
<th class="head">Examples</th>
<th class="head">Installation</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>Modbus</td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_Modbus.html#lcd-20x4-bricklet-modbus-api">API</a></td>
<td>&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr class="row-odd"><td>TCP/IP</td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_TCPIP.html#lcd-20x4-bricklet-tcpip-api">API</a></td>
<td>&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr class="row-even"><td>C/C++</td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_C.html#lcd-20x4-bricklet-c-api">API</a></td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_C.html#lcd-20x4-bricklet-c-examples">Examples</a></td>
<td><a class="reference internal" href="../../Software/API_Bindings_C.html#api-bindings-c">Installation</a></td>
</tr>
<tr class="row-odd"><td>C#</td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_CSharp.html#lcd-20x4-bricklet-csharp-api">API</a></td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_CSharp.html#lcd-20x4-bricklet-csharp-examples">Examples</a></td>
<td><a class="reference internal" href="../../Software/API_Bindings_CSharp.html#api-bindings-csharp">Installation</a></td>
</tr>
<tr class="row-even"><td>Delphi/Lazarus</td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_Delphi.html#lcd-20x4-bricklet-delphi-api">API</a></td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_Delphi.html#lcd-20x4-bricklet-delphi-examples">Examples</a></td>
<td><a class="reference internal" href="../../Software/API_Bindings_Delphi.html#api-bindings-delphi">Installation</a></td>
</tr>
<tr class="row-odd"><td>Java</td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_Java.html#lcd-20x4-bricklet-java-api">API</a></td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_Java.html#lcd-20x4-bricklet-java-examples">Examples</a></td>
<td><a class="reference internal" href="../../Software/API_Bindings_Java.html#api-bindings-java">Installation</a></td>
</tr>
<tr class="row-even"><td>JavaScript</td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_JavaScript.html#lcd-20x4-bricklet-javascript-api">API</a></td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_JavaScript.html#lcd-20x4-bricklet-javascript-examples">Examples</a></td>
<td><a class="reference internal" href="../../Software/API_Bindings_JavaScript.html#api-bindings-javascript">Installation</a></td>
</tr>
<tr class="row-odd"><td>LabVIEW</td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_LabVIEW.html#lcd-20x4-bricklet-labview-api">API</a></td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_LabVIEW.html#lcd-20x4-bricklet-labview-examples">Examples</a></td>
<td><a class="reference internal" href="../../Software/API_Bindings_LabVIEW.html#api-bindings-labview">Installation</a></td>
</tr>
<tr class="row-even"><td>Mathematica</td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_Mathematica.html#lcd-20x4-bricklet-mathematica-api">API</a></td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_Mathematica.html#lcd-20x4-bricklet-mathematica-examples">Examples</a></td>
<td><a class="reference internal" href="../../Software/API_Bindings_Mathematica.html#api-bindings-mathematica">Installation</a></td>
</tr>
<tr class="row-odd"><td>MATLAB/Octave</td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_MATLAB.html#lcd-20x4-bricklet-matlab-api">API</a></td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_MATLAB.html#lcd-20x4-bricklet-matlab-examples">Examples</a></td>
<td><a class="reference internal" href="../../Software/API_Bindings_MATLAB.html#api-bindings-matlab">Installation</a></td>
</tr>
<tr class="row-even"><td>Perl</td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_Perl.html#lcd-20x4-bricklet-perl-api">API</a></td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_Perl.html#lcd-20x4-bricklet-perl-examples">Examples</a></td>
<td><a class="reference internal" href="../../Software/API_Bindings_Perl.html#api-bindings-perl">Installation</a></td>
</tr>
<tr class="row-odd"><td>PHP</td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_PHP.html#lcd-20x4-bricklet-php-api">API</a></td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_PHP.html#lcd-20x4-bricklet-php-examples">Examples</a></td>
<td><a class="reference internal" href="../../Software/API_Bindings_PHP.html#api-bindings-php">Installation</a></td>
</tr>
<tr class="row-even"><td>Python</td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_Python.html#lcd-20x4-bricklet-python-api">API</a></td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_Python.html#lcd-20x4-bricklet-python-examples">Examples</a></td>
<td><a class="reference internal" href="../../Software/API_Bindings_Python.html#api-bindings-python">Installation</a></td>
</tr>
<tr class="row-odd"><td>Ruby</td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_Ruby.html#lcd-20x4-bricklet-ruby-api">API</a></td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_Ruby.html#lcd-20x4-bricklet-ruby-examples">Examples</a></td>
<td><a class="reference internal" href="../../Software/API_Bindings_Ruby.html#api-bindings-ruby">Installation</a></td>
</tr>
<tr class="row-even"><td>Shell</td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_Shell.html#lcd-20x4-bricklet-shell-api">API</a></td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_Shell.html#lcd-20x4-bricklet-shell-examples">Examples</a></td>
<td><a class="reference internal" href="../../Software/API_Bindings_Shell.html#api-bindings-shell">Installation</a></td>
</tr>
<tr class="row-odd"><td>Visual Basic .NET</td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_VBNET.html#lcd-20x4-bricklet-vbnet-api">API</a></td>
<td><a class="reference internal" href="../../Software/Bricklets/LCD20x4_Bricklet_VBNET.html#lcd-20x4-bricklet-vbnet-examples">Examples</a></td>
<td><a class="reference internal" href="../../Software/API_Bindings_VBNET.html#api-bindings-vbnet">Installation</a></td>
</tr>
</tbody>
</table>
</div>
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