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[Paparazzi-devel] autopilot wiring

From: Chris
Subject: [Paparazzi-devel] autopilot wiring
Date: Sat, 02 Jul 2011 13:20:44 +0300
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20110424 Thunderbird/3.1.10

Just to complete my test flight report i have to mention that i went in to
a "modular" construction.
The autopilot outputs 3 Multiplex 6 way plugs.
One goes to the engine and it carries the battery voltage
(connected to a 12v step down converter), the motor servo signal, the 5v servo power from the ESC, the current sensor's analog output and the current sensors voltage output (3.3v max).
The second outputs all necessary camera servo signals, +12 and +5v.
The third carries the remaining 4 servo channels.
In total i use 4 servos for the control surfaces, one for the motor and 3 for the camera. All other equipment's wires (modem, gps, imu, etc) are soldered directly to the TWOG's pcb
for added safety against vibrations.
This way the complete autopilot can be mounted inside a small plastic box, connected to the outside world via those three multiplex connectors, a usb socket for programming and a RP-SMA plug for the modem's antenna. Strangely the modem does not interfere with the electronics once connected with a piece of
coaxial cable and the antenna is mounted at least 60cm away.
Btw a 900 Mhz low pass filter is used at the modem's output.

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