[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Paparazzi-devel] BL ESC

From: Matthew Currie
Subject: Re: [Paparazzi-devel] BL ESC
Date: Thu, 30 Aug 2007 20:24:42 -0700
User-agent: Thunderbird (Windows/20070728)


  Thanks for the manual on ESCs =)  This is exactly what I was thinking about but was unsure how to explain it.  According to all the documentation I can find, the CC Phoenix line supports throttle mode settings where I can enable fixed endpoints whereas the CC Thunderbird ESC which is 1/2 the price does not have this feature advertised.  Do you an Anton know this to be the case?


address@hidden wrote:
Any controller can be used, the exact PWM value that is sent to the controller for 0-100% throttle is completely configurable in the airframe file so all controllers are compatible and any controller will arm properly with or without the use of an R/C transmitter.  Upon each boot, the autopilot immediately sends whatever you have defined as 0% throttle (typically around 1200ms) and maintains that signal until a manual or autonomous command is given.  Most modern controllers are "auto calibrating" which is an undesirable feature for R/C pilots and even more so for autonomous systems but can be dealt with.  The calibration is done by defining the PWM value at boot to be 0% power and then defining some initial arbitrary mid-range value such as 1500ms to be 100% until a higher value is seen.  The net result of this behavior is that the motor is given full power at any command above 50% throttle until 100% throttle has actually been commanded at least once.  This i
s not an issue for planes that routinely take off at 100% throttle but can disrupt the throttle tuning and altitude control on any flights where 100% throttle has never been commanded.  Castle Creations controllers can be configured for "fixed endpoints" which permanently sets the range to 1250-1850ms providing a consistent and predictable throttle response.
Throttle stick programming is also possible through the autopilot:  If the transmitter is on with the throttle at full or whatever is required for your ESC when the autopilot is first booted, the autopilot will immediately see the manual control signal and throttle position and pass that along to the ESC as the first value, triggering the programming mode.


  Permission to play dumb here but I do not have a lot of time to examine code, etc.  I would like to get an explanation as to what type of ESC is required to operate with the Tiny13.  There was mention that it cannot be a type with auto arming or similar.  High quality ESCs available domestically in my area have two distinct product lines, one being half the price of the other yet same current ratings but lacking half the luxury features including "throttle mode" which sounds suspicious.

Matthew Currie
Nanaimo, BC Canada

_______________________________________________ Paparazzi-devel mailing list address@hidden

reply via email to

[Prev in Thread] Current Thread [Next in Thread]