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Re: [Paparazzi-devel] How to control more than 8 ESC with paparazzi?

From: Christophe De Wagter
Subject: Re: [Paparazzi-devel] How to control more than 8 ESC with paparazzi?
Date: Thu, 19 Jan 2017 00:03:26 +0100

You can drive a lot of free pins with Pwm on stm32f4 boards. Look at the opa-fbw (Lisa mx clone) which directly drives 12 servos. Otherwise sbus is also great!

On Jan 18, 2017 11:22 PM, "Gautier Hattenberger" <address@hidden> wrote:


A S.BUS output driver have been added recently ( I have not tested it, but you should be able with this to control several (up to 7 it seems) S.BUS compatible servos or ESC (or use a decoder board like maybe?) from a single UART TX.


Le 18/01/2017 à 22:28, Michal Podhradsky a écrit :
Hi Hao,

you could remap some of the other pins (UART,SPI,GPIO) to PWM output since most of them have timers associated with them (I recommend having a look at the Lisa M schematics). That should give you enough ouputs. Indeed it would be at 3.3V logic, so you would need some voltage converter to make it compatible with the servos/ESC.

The drawback is that you would have to sacrifice certain IO depending on how many extra outputs you need. The software side should be pretty straightforward, you would just have to define extra PWM outputs in the board files.


On Wed, Jan 18, 2017 at 10:13 AM, Ranger <address@hidden> wrote:
Dear All The autopilot board, such as lisa M, has only 8 PWM output, and may not be just not enough if more rotors/servos are needed. Is there any way of control more than 8 ESCs/servos using paparazzi? Which would be much useful in multi-rotors(see attached photo) and other hybrid platforms. I was thinking about some arm base board, such as raspberry pi, and customize it by simply adding more I/O ports for GPS, IMU and PWM....Anyone have comment interest in this? I knew there was a Linux based paparazzi initiated in 2010, and personally I think it has the potential to be much more powerful than Lisa M. Much appreciated if any one can teach me on existing paparazzi ones. Looking forward to hearing from you. Best Hao Evolo

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