1.2. What you will need

<p>These additional items are needed for using the Zumo 32U4 robot:</p> <table class="picture_with_caption right"><tr><td style="max-width: 200px"><a href="https://a.pololu-files.com/picture/0J2814.1200.jpg?ad3f3498d98651f9c63350f34daaf779" class="noscript-fallback"><img alt="" class="zoomable" data-gallery-pictures="[{&quot;id&quot;:&quot;0J2814&quot;,&quot;caption&quot;:&quot;\u003cp\u003eMicro Metal Gearmotor with Extended Motor Shaft.\u003c/p\u003e&quot;,&quot;url_tiny&quot;:&quot;https://a.pololu-files.com/picture/0J2814.98x98.jpg?ad3f3498d98651f9c63350f34daaf779&quot;,&quot;url_medium&quot;:&quot;https://a.pololu-files.com/picture/0J2814.600x480.jpg?ad3f3498d98651f9c63350f34daaf779&quot;,&quot;url_full&quot;:&quot;https://a.pololu-files.com/picture/0J2814.1200.jpg?ad3f3498d98651f9c63350f34daaf779&quot;,&quot;longest_side&quot;:800}]" data-picture-id="0J2814" data-picture-longest_side="800" src="https://a.pololu-files.com/picture/0J2814.200.jpg?ad3f3498d98651f9c63350f34daaf779" /></a></td><p></tr><tr><th style="max-width: 200px"><p>Micro Metal Gearmotor with Extended Motor Shaft.</p></th></tr></table> <table class="picture_with_caption right"><tr><td><a href="https://a.pololu-files.com/picture/0J3933.1200.jpg?82a1e599e91d4f8e0fe8d0f4df384752" class="noscript-fallback"><img alt="" class="zoomable" data-gallery-pictures="[{&quot;id&quot;:&quot;0J3933&quot;,&quot;caption&quot;:&quot;\u003cp\u003ePololu Zumo chassis, assembled top view without acrylic plate, shown with motors (not included).\u003c/p\u003e&quot;,&quot;url_tiny&quot;:&quot;https://a.pololu-files.com/picture/0J3933.98x98.jpg?82a1e599e91d4f8e0fe8d0f4df384752&quot;,&quot;url_medium&quot;:&quot;https://a.pololu-files.com/picture/0J3933.600x480.jpg?82a1e599e91d4f8e0fe8d0f4df384752&quot;,&quot;url_full&quot;:&quot;https://a.pololu-files.com/picture/0J3933.1200.jpg?82a1e599e91d4f8e0fe8d0f4df384752&quot;,&quot;longest_side&quot;:800}]" data-picture-id="0J3933" data-picture-longest_side="800" src="https://a.pololu-files.com/picture/0J3933.200.jpg?82a1e599e91d4f8e0fe8d0f4df384752" /></a></td></tr></table> <table class="picture_with_caption right"><tr><td><a href="https://a.pololu-files.com/picture/0J9837.1200.jpg?2be53c31d303aeea184270a3edf8f7fd" class="noscript-fallback"><img alt="" class="zoomable" data-gallery-pictures="[{&quot;id&quot;:&quot;0J9837&quot;,&quot;caption&quot;:&quot;\u003cp\u003ePololu Zumo chassis kit, assembled bottom view with battery holder cover removed.\u003c/p\u003e&quot;,&quot;url_tiny&quot;:&quot;https://a.pololu-files.com/picture/0J9837.98x98.jpg?2be53c31d303aeea184270a3edf8f7fd&quot;,&quot;url_medium&quot;:&quot;https://a.pololu-files.com/picture/0J9837.600x480.jpg?2be53c31d303aeea184270a3edf8f7fd&quot;,&quot;url_full&quot;:&quot;https://a.pololu-files.com/picture/0J9837.1200.jpg?2be53c31d303aeea184270a3edf8f7fd&quot;,&quot;longest_side&quot;:1200}]" data-picture-id="0J9837" data-picture-longest_side="1200" src="https://a.pololu-files.com/picture/0J9837.200.jpg?2be53c31d303aeea184270a3edf8f7fd" /></a></td></tr></table></p> <ul> <li>four AA batteries&#8212;the robot works with both alkaline and NiMH batteries, though we recommend using rechargeable <a href="/product/1003">AA NiMH cells</a></li> <li><a href="/product/2072">USB A to Micro-B cable</a> to connect the robot to your computer for programming and debugging</li> <li>small 2&nbsp;mm slotted screwdriver for adjusting the LCD contrast <em>(original LCD version only)</em></li> </ul> <p>In addition, the <strong>kit version</strong> of the robot requires:</p> <ul> <li>two micro metal gearmotors with extended motor shafts (see below)</li> </ul> <h4>Kit motor selection</h4> <p>The kit version of the Zumo 32U4 robot requires the addition of <strong>two</strong> micro metal gearmotors <strong>with extended motor shafts</strong>, one for each tread.</p> <p>The ideal motors for your robot depend on your desired torque, speed, and current draw. We generally recommend using HP versions of our micro metal gearmotors since the tracks require a decent amount of torque to move effectively; higher gear ratios of the non-HP motors might work if you want lower current draw, but they will be slower and offer less control.</p> <p>If you are unsure which motors to choose, we recommend getting <strong>two</strong> of the <a href="/product/2215"><strong>75:1 Micro Metal Gearmotor HP with Extended Motor Shaft</strong></a>, which offer a good balance of performance characteristics, and most of our example code was developed and tested with these motors. <a href="/product/2213">50:1 HP</a> and <a href="/product/2215">100:1 HP</a> motors also generally work well. These three motor types are the ones we offer in assembled Zumo 32U4 robots.</p> <p>The following table summarizes the key specifications of the recommended 50:1 HP, 75:1 HP, and 100:1 HP motors. The first four columns are specifications of the motors themselves, while the last column is the measured top speed of a Zumo chassis loaded to a weight of 500&nbsp;g and driven with these motors. Note that the specifications are for 6V operation, which is approximately the voltage you would get with four fresh alkaline batteries; four NiMH AA cells will typically provide less than 5V.</p> <table style="line-height:100%; text-align: right;" class="reference"> <tr style="line-height: 150%;"> <th>Micro Metal<br/>Gearmotor</th> <th>Free-Run Speed<br/>@ 6V</th> <th>Stall Torque<br/>@ 6V</th> <th>Stall Current<br/>@ 6V</th> <th colspan="2">Top Zumo Speed<br/>@ 6V and 500g</th> </tr> <tr> <th style="text-align:left;"><a href="/product/2213">50:1 HP</a></th> <td>625 RPM</td> <td>15 oz·in</td> <td>1600 mA</td> <td style="border-right: none;">40 in/s</td> <td style="border-left: none;">(100 cm/s)</td> </tr> <tr> <th style="text-align:left;"><a href="/product/2215">75:1 HP</a></th> <td>400 RPM</td> <td>22 oz·in</td> <td>1600 mA</td> <td style="border-right: none;">25 in/s</td> <td style="border-left: none;">(65 cm/s)</td> </tr> <tr> <th style="text-align:left;"><a href="/product/2214">100:1 HP</a></th> <td>320 RPM</td> <td>30 oz·in</td> <td>1600 mA</td> <td style="border-right: none;">20 in/s</td> <td style="border-left: none;">(50 cm/s)</td> </tr> </table> <p>For more options, you can see our other <a href="/category/141/micro-metal-gearmotors-with-extended-motor-shafts">micro metal gearmotors with extended motor shafts</a>. Be sure to pick a motor that has an extended shaft, or else you will not be able to use the encoders on the Zumo 32U4.</p> <h4>Kit assembly tools</h4> <p>These additional items are needed for assembling the Zumo 32U4 robot kit:</p> <ul> <li>soldering iron and solder (we recommend one with adjustable temperature control)</li> <li>wire cutter</li> <li>small #1 Phillips screwdriver</li> <li>3&nbsp;mm Allen wrench (hex key)</li> <li>long-nose pliers (for bending the IR LED leads and Zumo 32U4 blade mounting tabs)</li> <li>tape or small clamps (for holding parts together when soldering)</li> </ul> <h4>Additional optional components</h4> <p>You might also consider getting these for your Zumo 32U4 robot:</p> <ul> <li><a href="/category/7/sensors">Sensors</a>, such as <a href="/category/79/sharp-distance-sensors">optical</a> or <a href="/category/78/sonar-range-finders">sonar range finders</a> (the Zumo 32U4 already has built-in IR proximity sensors, but additional sensors can be incorporated for increased range or detection area)</li> <li><a href="/category/19/connectors">Connectors and jumper wires</a>, for connecting additional sensors and components</li> <li>Battery charger, if you are using rechargeable batteries; since the Zumo just uses ordinary AA batteries, we recommend basic AA chargers (into which you stick the individual cells) available at most general electronics stores, though we carry a much fancier <a href="/product/2588">iMAX-B6AC V2 balance charger/discharger</a> that can be also used for this</li> </ul>