Flexible chassis 2WD & 4WD robot

prusaprinters

<p>A set of printed components to build 2WD or 4WD robots that can be controlled and managed by any of the Raspberry Pi single board computers (SBCs), a Raspberry Pi Pico microcontroller or an ESP32 microcontroller. Detailed descriptions of all aspects of this evolving project are at <a href="https://onlinedevices.co.uk/Flexible+Hardware+Design+Project"><strong>this link</strong></a>.</p><p>The main, single plate 3D printed chassis is designed to allow a standard set of drive, sensor and other components to be assembled in a number of different arrangements to allow different build configurations. It has also been designed to allow individual customisation with Lego blocks and/or card cut-outs that insert into custom 3D printed Lego-compatible blocks (the files for the LEGO-compatible blocks for card cut-outs are available <a href="https://www.prusaprinters.org/prints/67808-esp8266-2wd-robot-components"><strong>here</strong></a>).&nbsp;</p><p>All the components use 1.75mm PLA and a layer height of 0.15mm with print details for each component produced on an i3 Mk3 shown in the table below.</p><p>Further details on this evolving project are at <a href="https://onlinedevices.co.uk/Flexible+Hardware+Design+Project"><strong>this link</strong></a>.</p><p>Updates:</p><ul><li>main chassis plate updated 17th Sept'21 to correct servo and ON/OFF rocker switch cut-outs</li></ul><p>&nbsp;</p><figure class="table"><table><tbody><tr><td><strong>component file name/description</strong></td><td style="text-align:center;width:80px;"><strong>needs support (Y/N)</strong></td><td style="text-align:center;width:60px;"><strong>brim (mm)</strong></td><td style="text-align:center;width:82px;"><strong>filament</strong><br><strong>length (m)</strong></td><td style="text-align:center;width:75px;"><strong>print time&nbsp;</strong><br><strong>(i3 Mk3)</strong></td></tr><tr><td><i>mega-flex_chassis_plate22b_repaired.stl:</i> main chassis plate with&nbsp;Lego-compatible studs on the top surface (small correction made to servo cut-out and ON/OFF rocker switch cut-out 17th Sept'21)</td><td style="text-align:center;">N</td><td style="text-align:center;">10</td><td style="text-align:center;">16.30</td><td style="text-align:center;">5h 18m</td></tr><tr><td><i>4x_motor_fixing_tab02.stl: </i>tabs that insert into the chassis plate to&nbsp;secure the drive motors</td><td style="text-align:center;">N</td><td style="border:1px solid rgb(191, 191, 191);padding:0.4em;text-align:center;">3</td><td style="border:1px solid rgb(191, 191, 191);padding:0.4em;text-align:center;">1.36</td><td style="border:1px solid rgb(191, 191, 191);padding:0.4em;text-align:center;">31m</td></tr><tr><td><i>L298N_vcradleHi_mega01_roty90.stl</i>: vertical fixing mount for a L298N motor controller</td><td style="text-align:center;">N</td><td style="text-align:center;">0</td><td style="text-align:center;">1.35</td><td style="text-align:center;">39m</td></tr><tr><td>H<i>C-SR04_transverse_fixed_plate01.stl</i>: fixed ultrasonic sensor mount</td><td style="text-align:center;">N</td><td style="text-align:center;">0</td><td style="text-align:center;">0.6</td><td style="text-align:center;">20m</td></tr><tr><td><i>HC-SR04_servo_holder02.stl</i>: servo mounted ultrasonic sensor</td><td style="text-align:center;">N</td><td style="text-align:center;">0</td><td style="text-align:center;">0.81</td><td style="text-align:center;">25m</td></tr><tr><td><i>HC-SR04_Pi-cam__transverse_fixed_plate05.stl</i>: fixed mount for ultrasonic sensor and Raspberry Pi camera</td><td style="text-align:center;">N</td><td style="text-align:center;">0</td><td style="text-align:center;">1.46</td><td style="text-align:center;">1h 0m</td></tr><tr><td><i>HC-SR04+camera_servo_arm09.stl</i>: servo mounted ultrasonic sensor and USB camera mount</td><td style="text-align:center;">N</td><td style="text-align:center;">5</td><td style="text-align:center;">2.35</td><td style="text-align:center;">1h 35m</td></tr><tr><td><i>OLED1_flat08-front+back.stl</i>: 128x64 OLED 2pc mount assembly for the 27.3 mm wide and 27.8mm high OLED</td><td style="text-align:center;">N</td><td style="text-align:center;">0</td><td style="text-align:center;">2.64</td><td style="text-align:center;">1h 15m</td></tr><tr><td><i>OLED2_flat05-front+back.stl</i>: 128x64 OLED 2pc mount assembly for the 24.7mm wide and 27.0mm high OLED</td><td style="text-align:center;">N</td><td style="text-align:center;">0</td><td style="text-align:center;">2.77</td><td style="text-align:center;">1h 16m</td></tr><tr><td><i>32mm_top_open__left-right_bat_holder02.stl</i>: 32mm 5000mAh 5V/2A <i>battery bank</i> mounting clips</td><td style="text-align:center;">Y</td><td style="text-align:center;">0</td><td style="text-align:center;">2.21</td><td style="text-align:center;">52m</td></tr><tr><td><i>21mm_top_open__left-right_bat_holder01.stl</i>: 21mm 3350mAh 5V/1A&nbsp;<i>battery bank</i> mounting clips</td><td style="text-align:center;">N</td><td style="text-align:center;">0</td><td style="text-align:center;">1.25</td><td style="text-align:center;">33m</td></tr><tr><td><i>stretched_40mm_caster_loose03.stl</i>: front or rear castor that holds&nbsp;a marble ball&nbsp;</td><td style="text-align:center;">N</td><td style="text-align:center;">5</td><td style="text-align:center;">2.55</td><td style="text-align:center;">1h 34m</td></tr><tr><td><i>mega-flex_RPi_maker_kit_2x_spacer02.stl:</i> two hexagonal spacers that secure the overhanging portion of the RPi Maker Kit PCB to the chassis plate.</td><td style="text-align:center;">N</td><td style="text-align:center;">5</td><td style="text-align:center;">0.63</td><td style="text-align:center;">27m</td></tr><tr><td><i>PiZero_mount01.stl</i>: PiZero 'mount' that screws to the chassis plate and this then aligns with the outer pair of the PiZero mounting holes.</td><td style="text-align:center;">N</td><td style="text-align:center;">0</td><td style="text-align:center;">0.55</td><td style="text-align:center;">19m</td></tr><tr><td><i>mega-flex_USB_adaptor_holders_left01+right01.stl</i>: mounts to secure a 3 port USB + ethernet adaptor to the chassis plate which overcomes the lack of multiple USB ports on a PiZero</td><td style="text-align:center;">N</td><td style="text-align:center;">0</td><td style="text-align:center;">1.65</td><td style="text-align:center;">42m</td></tr><tr><td><i>ESP32_side_leg01.stl</i>: &nbsp;‘legs’ that attach one side of the ESP32 Maker Kit PCB to a separate mount (see below) that attaches to the chassis plate</td><td style="text-align:center;">N</td><td style="text-align:center;">0</td><td style="text-align:center;">0.69</td><td style="text-align:center;">26m</td></tr><tr><td><i>ESP32_side_leg_mount01.stl</i>: &nbsp;chassis plate mount for the side 'legs' refrenced above</td><td style="text-align:center;">N</td><td style="text-align:center;">0</td><td style="text-align:center;">0.37</td><td style="text-align:center;">16m</td></tr><tr><td><i>mega-flex_ESP32_maker_kit_centre_leg01.stl</i>: ' leg' that attaches the other side of the Pico Maker Kit PCB to the chassis plate</td><td style="text-align:center;">N</td><td style="text-align:center;">0</td><td style="text-align:center;">0.61</td><td style="text-align:center;">18m</td></tr><tr><td><i>Pico_mount01.stl</i>: leg mount for attaching one side of the Pico Maker Kit PCB to the chassis plate</td><td style="text-align:center;">N</td><td style="text-align:center;">0</td><td style="text-align:center;">0.89</td><td style="text-align:center;">39m</td></tr><tr><td><i>Pico_side_leg01.stl</i>: leg mount for attaching the other side of the Pico Maker Kit PCB to the chassis plate</td><td style="text-align:center;">N</td><td style="text-align:center;">0</td><td style="text-align:center;">0.61</td><td style="text-align:center;">18m</td></tr><tr><td><i>mega-flex_PCB_mounts01-left+right.stl</i>: pair of mounts for the custom PCB that can connect any of the system controller options</td><td style="text-align:center;">N</td><td style="text-align:center;">0</td><td style="text-align:center;">1.82</td><td style="text-align:center;">59m</td></tr></tbody></table></figure><p>&nbsp;</p>