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hardware_setup.md

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Hardware Setup

Follow these instructions to build JetRacer - Latrax Rally version. After you've finished, move on to the software setup.

Tools

  • Phillips screwdriver set
  • Hex screwdriver
  • Soldering iron
  • Drill with 3mm and 6mm drill bits
  • Pliers
  • Wire strippers

Phase 1 - Car disassembly

Step 1 - Remove shroud from car

  1. Remove the 4 pins securing the shroud

  2. Remove the shroud from the chassis

Step 2 - Remove ESC and RC receiver from car

  1. Remove the two screws securing the electronics hub to the chassis

  2. Pry the electronics hub from the chassis

  3. Remove the ESC and RC receiver from the electronics hub

  4. Disconnect the two servo cables from the RC receiver

  5. Remove the foam adhesive from the RC receiver

Phase 2 - Car wiring

Step 1 - Connect Jetson to servo driver

  1. Select 4 female-to-female jumper cables from the bundle

  2. Attach the jumpers to the servo driver pins VCC (white), SDA (gray), SCL (purple) and GND (black)

  3. Attach the other end of the jumpers to the Jetson Nano pins 3.3V (white), 3 (gray), 5 (purple) and GND (black)

Step 2 - Connect servo driver to multiplexer

  1. Connect channel 0 on the servo driver to channel S1 on the multiplexer

    Pay attention to the orientation of the cable for these steps!

  2. Connect channel 1 on the servo driver to channel S2 on the multiplexer

Step 3 - Connect RC receiver to multiplexer

  1. Connect channel 3 on the RC receiver to SEL on the multiplexer

  2. Connect channel 2 on the RC receiver to M2 on the multiplexer

  3. Connect channel 1 on the RC receiver to M1 on the multiplexer

Step 4 - Connect multiplexer to ESC and servo

  1. Connect the servo to OUT1 on the multiplexer

  2. Connect the ESC to OUT2 on the multiplexer

Phase 3 - Car assembly

Step 1 - Mount ESC to base plate

  1. Attach ESC to the base plate as indicated

    Notice the two slots on the base plate for the ESC

  2. Press down firmly to secure the ESC

Step 2 - Mount RC receiver to base plate

  1. Attach the RC receiver to the base plate as indicated

  2. Press down firmly to secure the RC receiver

Step 3 - Expose screw holes used to mount base plate

  1. Remove the 4 screws indicated to expose holes used to mount the base plate

Step 4 - Mount base plate to RC car

  1. Select 4 M3x20mm standoffs, 2 M2x38mm screws and 2 M2x30mm screws

  2. Attach the base plate to the RC car chassis as indicated

  3. Fasten the base plate using a hex screwdriver

Step 5 - Route servo motor wire through base plate

If the servo cable is not long enough to reach around the base plate, please route it as follows

  1. Remove the servo cable from OUT1 on the multiplexer that we attached previously

  2. Route the servo wire through the slot base plate as indicated

  3. Reconnect the servo cable to OUT1 on the multiplexer

Step 6 - Mount components to base plate

  1. Select 10 of the M2x6mm screws

  2. Fasten the multiplexer to the base plate

  3. Fasten the servo driver to the base plate

  4. Fasten the Jetson Nano to the base plate

Step 7 - Connect WiFi card

  1. Attach the two antennas to the WiFi card

  2. Remove the Jetson Nano module from the developer kit board as indicated

  3. Remove the M2 connector securing screw on the developer kit base board

  4. Insert the WiFi card into the M2 connector slot

  5. Reattach the screw to secure the WiFi card

  6. Reattach the Jetson Nano module to the developer kit board

Step 8 - Connect camera

  1. Attach the camera to the Jetson Nano developer kit as indicated

    Be careful when loosing the camera connector to not break it

  2. Attach the camera mount to the base plate using 4 M2x6mm screws

  3. Attach the camera to the camera mount using 4 M2x6mm screws

Step 9 - Mount USB battery pack

  1. Attach the USB battery pack to the underside of the base plate as indicated

Step 10 - Attach USB barrel plug

  1. Attach the 2 pin jumper to J48 on the Jetson Nano developer kit to enable barrel plug power

  2. Insert the barrel plug into the Jetson Nano developer kit

    Before powering on, you'll need to follow the software setup to configure the SD card

Phase 4 - RC transmitter modification

Step 1 - Dissasmble radio

  1. Remove the 5 screws securing radio halves with a phillips screwdriver

  2. Peel off the radio stick joining the two halves

  3. Place the radio sticker on one half of the radio

  4. Remove the battery cover

  5. Separate the radio into halves

Step 2 - Remove trim / reset PCB

  1. Remove screw securing the trim/reset PCB

  2. Carefully sliding the wires out of the securing clip and pull the PCB to the side

Step 3 - Drill hole for manual override switch

  1. Mark the RC transmitter as indicated by the screwdriver tip

  2. Using a 6mm diameter drill bit, drill a hole through the marked location

Step 4 - Drill hole for switch key

  1. Temporarily insert the switch into the RC transmitter

  2. Place the key washer on the other side of the transmitter

  3. Mark the RC transmitter at the location of the screwdriver tip

  4. Using a roughly 2.5mm - 3.5mm drill bit, drill a hole through the marked location

Step 5 - Fasten manual switch to RC transmitter

  1. Re-insert the manual override switch into the hole

  2. Place the keyed washer and nut back on the switch

  3. Fasten the switch to the RC transmitter using pliers

Step 6 - Solder switch to RC transmitter PCB

  1. Cut the wires roughly at the length indicated

    Ensure you cut the wires with enough length to reach the solder pads

  2. Strip the wires as indicated

  3. Apply solder to the two pads indicated

  4. Apply solder to the stripped wire leads

  5. Using pliers, hold the wires against the pads indicated and apply heat with the soldering iron

Step 7 - Reassemble RC transmitter

  1. Re-attach the halves of the RC transmitter

  2. Fasten the halves using the original screws

  3. Insert the 4 AA batteries, and apply the battery cover

Hardware setup complete!

Next

Next, follow the software setup.