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Re: [Paparazzi-devel] Lisa/L Servos

From: Gareth Roberts
Subject: Re: [Paparazzi-devel] Lisa/L Servos
Date: Tue, 23 Nov 2010 16:11:32 -0000
User-agent: Opera Mail/11.00 (Linux)

Arduino maybe? The duct tape of electronics...

On Tue, 23 Nov 2010 14:41:48 -0000, Rui Costa <address@hidden> wrote:


One of my aircrafts will has servos with 1,5m distance from autopilot. It
will be better use Can Servo Controllers.

You have instructions to build the Can Servo Controllers?

Rui Costa

On Tue, Nov 23, 2010 at 12:14 AM, antoine drouin <address@hidden> wrote:

> so the PPM input is not on the CON_SERVOS_2 connector, though it is
> named RC_PPM on the schematic? What pin do you connect the receiver to?

you can use that pin or another one - the current code defaults to the
"ST_UART1_TRIG" pin on the UART1 connector
The pin assignment is rather flexible on the stm32.

>> If you're not using some
>> peripherals ( like I2C1, which is commonly used to talk to the I2C
>> motor controllers on quadrotors) I could write code to use those pins
>> to drive two more servos ( this is how I designed lisa/M, 6 servos and
>> I2C1 or 8 servos ).
> I'll probably need one I2C for sensors. Is I2C2 used by default?

I2C2 is used for the baros, but there's a connector and bandwidth available


> Do you know if CAN is better in this case than I2C?

 CAN is definitely better suited for long wires and perturbed
environments than I2C

>> The CSC board (Can Servo Controller) could be used for that (
>> )
> is this what the sw/airborne/csc software and misc/csc hardware is
> about? Is there any documentation on this?

No documentation as far as I know - Eagle files are in the svn

>> An even better solution would be to use a lisa/M (
>> )
> Is there already more information about this than on the Lisa wiki page?

No more information I'm sorry. Contact me offlist and I might be able
to get you a proto.

>> You could have for example one servo driver in each wing of your
>> vehicle ( and maybe another one in the tail ). The electrical
>> connection would be only two wires for CAN and two wires for power.
> Ailerons, flaps and motor controllers are no more than 60 cm away. I
> think I'll to drive these directly from Lisa and see about the jitter.
> The tail is farther, so I'd rather put an extra controller there.

sounds like a good idea. So you'd have enough with the 6 servo signals
available on lisa/L


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