• 3DR ArduCopter Quad-C (new version Quad-D is now available)
• PX4FMU
• Compatible PPM sum receiver, e.g. FrSky TFR4
• uBlox or Mediatek GPS module
• Telemetry Module (e.g. 3DR Radio 433MHz module)
• DF13 15 Position Connector to Individual Female Pins
• 5-pin header (goes with 3DR Radio Telemetry Kit cable)
• 3-pin header (from any servo)
• Buzzer

Build instructions for 3DR Quad C frame can be found here: 3DR ArduCopter Quad-C Assembly Guide.

Frame with installed power board:

It's higly recommended to insert resistor 1k-10k on power board before battery voltage wire to avoid damage of PX4 in case of wrong installation.

PX4FMU mounted on the first level:

To leave original 3DR frame connectors untouched “Multi-Receiver-Frame-Telemetry” adapter can be used. It can be soldered from:

• DF13 15-pin cable
• 3-pin header for receiver
• 5-pin (or more) header for telemetry
• 2×4-pins header for 3DR frame

I found that it will be better to cut DF13 15-pin cable at 1/3 from Multi connector, not at 1/2 as I have done.

Looks like spaghetti :)

LEDs mounted on top and bottom sides for more beauty in sky especially for night flights:

LED switched by simple transistor key.

TODO add schematics

LED strips drived by gpio_led app demo: