UAV Mapper Electronics and Pixhawk Installation Guide

Overview

Do each of the steps below in sequence to install your motor, servos, ESC, and Pixhawk.

  1. Electronics Required when DIY building a UAV Mapper airframe
  2. Pixhawk pin out and accessory locations
  3. Install the motor
  4. Install the servos
  5. Configure the Electronic Speed Control (ESC)
  6. Install GPS/Compass(s)
  7. Install airspeed pitot tube and sensor
  8. Install the Pixhawk and connect devices

Electronics - not included with airframe

Pixhawk pin out and accessory locations

The UAV Mapper parameter file configured for the following accessories and positions:

Install the motor

There are two Turnigy 3542-1000KV motors - V1 and V2. Both perform the same. V1 motor shafts exit the rear of the motor and must be trimmed. Both versions are shown below.

  1. Trim shaft using a Dremel with a cut off wheel,
  2. Install X mount.
  3. Install the prop adapter using 3 screws.
  1. Install the X mount and prop adapter.
  2. Slide on the prop adapter.
  3. Feed the three motor wires through the opening in the bottom of the motor mount. Mount the motor to the motor mount with the four 3mm x 8mm screws.

Danger: Do not install the propeller until all configuration is complete.

Configure the Electronic Speed Control (ESC)

You must add power connectors and reprogram the Turnigy Plush 40 ESC.

  1. Solder a male HXT60 connector and female 3.5 mm bullet connectors on to the ESC.
  2. In this order - Connect your Plush 40 ESC to a Turnigy ESC programming card, then connect your battery to your power module as shown.
  3. Use the Arrow buttons to set:
    • Brake to ON so your propeller is less likely to strike the ground during landings.
    • Battery Type to NI-xx so the ESC does not automatically shut off power to the motor if the battery voltage drops below ~ 10 volts. This is designed to save your Lipo battery from over discharging damage, but is undesirable when the Pixhawk can monitor voltage.
  4. Press the OK button to save changes.

Mount pitot tube

  1. Slide pitot tube into mount and install screw. Cut silicone tubing in 1/2 and push through body.

Mount Pixhawk, airspeed sensor, and I2C splitter

  1. Hot glue the airspeed sensor and I2C splitter to the Pixhawk mount board.
  2. Stick the loop Velcro to the back of your Pixhawk and place on board.
  3. Install the following servo extensions:
  4. Pixhawk Extension Length Peripheral
    RC 30cm SBUS out from receiver
    SB 30cm RSSI out from receiver
    MAIN OUT 1 30cm Right wing servo
    MAIN OUT 2 15cm Left wing servo
    AUX OUT 4 15cm Hot shoe
    AUX OUT 2 15cm Camera trigger
    AUX OUT 1 15cm Parachute
  5. Connect the I2C splitter to the I2C port on your Pixhawk.
  6. Connect the airspeed sensor to the I2C splitter.
  7. Install the ARM button in the body.

Install the parachute

  1. Insert the servo wire into the slot at the front of the parachute opening and pull the wire through the back of the opening.
  2. Push down the parachute to the bottom of the body.
  3. Install the four M3 screws (included with parachute) through the parachute plate.

Mount the GPS/compass

  1. Use the supplied Velcro to stick the GPS/Compass to the mount. Aim arrow at notch. (left)
  2. Slide the GPS/Compass wires through the top half of the orange wire guide.

Mount the telemetry radio

  1. Insert the telemetry radio into the foam cut-out.

Install Pixhawk and make final connections

  1. Slide the Pixhawk into the body.
  2. Plug the 6 pin connector into the GPS port on the Pixhawk. Plug the 4 pin connector into any port on the I2c splitter.
  3. Connect the silicone hose to the tubes as shown.
    1. Straight pitot tube (stagnation tube) to port further from circuit board.
    2. Angle pitot tube (static tube) to port closest to circuit board.
  4. Connect telemetry radio to TELEM 1 on the Pixhawk.
  5. Connect the ESC servo connector to MAIN OUT 3.
  6. Connect power module to ESC and Power port on Pixhawk.
  7. Connect the three motor ESC wires to the motor. The wires are not marked. Connect in any order. Switch any two wires to make the motor spin the correct direction.

Install the FrSKY L9R RC receiver

  1. Set receiver and antennas in the receiver mount. Attach with hot glue.
  2.  Insert the receiver into the right wing.
  3. Connect the SBUS wire from the L9R

Install the parachute

Install the Servos

  1. Use needle nose pliers to push the servo wire through the hole in the bottom cover.
  2. Install the pushrod in the middle outside hole on the servo arm. Widen the servo arm with 1/16" drill bit so the pushrod will fit.
    Note: You will center the servos later when you configure your Pixhawk and transmitter.

  3. Connect 15cm servo extensions and shrink tube (included).

  4. Note: Install shrink tube after you push the servo wire through the bottom cover.
  5. Tuck servo extension into groove on wing bottom and tack with hot glue. Do not use CA as it will be too permanent.
  6. Install the wings on the body
    • Connect the right wing servo to MAIN OUT 1.
    • Connect the left wing servo to MAIN OUT 2.

Continue to UAV Mapper Transmitter and Pixhawk Configuration Guide >>