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  • Simon D. Levy
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  • Andrew Pan
  • mohamed arafat
  • Crashpilot1000
  • Montasser Wahid
  • William Premerlani

MHefny's Groups

MHefny's Discussions

Compiling 3DRRadio SIK Issues

Started Feb 17 0 Replies

Hi,I am trying to compile [https://github.com/tridge/SiK] firmware using eclipse and SDCC.I have spent two weeks now with no success.I installed SDCC, and…Continue

Tags: SDCC, compile, SIK, firmware, 3DR

APM 2.5 Connection Problem in Mission Planner

Started Dec 26, 2012 0 Replies

The board was working great... then and with no reason LED B & A stopped working.first I failed to connect to Mission Planner, but then I figured out that pressing the reset button allows me to…Continue

Quadcopter Control-Function Layers

Started this discussion. Last reply by Anis Chihi May 22, 2013. 2 Replies

IntroductionQuadcopters is a very active topic, it is fun and easy to build, and make use of rich set of sensors for stabilizing and navigation. So if you like flying, mechanics and programming then…Continue

Tags: framework, control, quadcopter, hefnycopter

 

MHefny's Page

Latest Activity

Overtuner replied to MHefny's discussion Changing Main frequency of HM-TRP 3DR Radio for Telemetry using AT Commands
"beside all the discussion about circuitry and frequencies - I flashed my (use in Europe is a bad Idea) 915Mhz Kits - my mistake in ordering - to a legal 868 Version. next week I'll do some range test. @ MHefny you made my day!"
Oct 25
VENKAT RAVI KISHORE commented on MHefny's blog post Python Scripting in Mission Planner
"Did you ever work with Way Point Navigation?? I tried several times with my both hex and quad-copters. I got good results with quad-copter but with hex-copter I dunno whats the problem but its all the time crashing. If you have any Idea please let…"
Oct 20
VENKAT RAVI KISHORE commented on MHefny's blog post Python Scripting in Mission Planner
"Hi MHefny, Did you ever work with optical flow sensor?? I gave a trail with that, my quad was able to hold that particular altitude but its not holding Pitch and Roll. It is all the time moving here and there so if you ever work with OFS please let…"
Oct 20
MHefny commented on MHefny's blog post Python Scripting in Mission Planner
"U welcome ..... I am happy when my work is useful... Thanks for the feedback :)"
Oct 20
VENKAT RAVI KISHORE commented on MHefny's blog post Python Scripting in Mission Planner
"Today I tested it and got the positive result. I mounted APM2.5 on a quad-copter and I connected it with Mission Planner via telemetry link. Before flying I developed codes for Arming motors, throttle raise, stabilizing, roll, pitch, yaw, land and…"
Oct 20
MHefny commented on chrisa's blog post Heavy lifting VTOL technology, frames.
" Thanks for the article, I liked the vertical bars, I have my own design please check this design for rigidity it is super strong and never bends at all :) "
Oct 9
Lynton replied to MHefny's discussion Changing Main frequency of HM-TRP 3DR Radio for Telemetry using AT Commands
"Ahh ok :) i really enjoy fiddling with these things! "
Sep 20
MHefny replied to MHefny's discussion Changing Main frequency of HM-TRP 3DR Radio for Telemetry using AT Commands
"as Marcin Krawczyk  said ... the chip is the same ... the output LC is different, so u still can change frequency using chip , but will not be able to practically use it for any useful range. "
Sep 4
Marcin Krawczyk replied to MHefny's discussion Changing Main frequency of HM-TRP 3DR Radio for Telemetry using AT Commands
"Because they are physically different. 433 or 868 or 915MHz"
Sep 3
Lynton replied to MHefny's discussion Changing Main frequency of HM-TRP 3DR Radio for Telemetry using AT Commands
"Okay so after reading this thread, is my understanding correct, the cards can do either 433 or 915 BUT the filters are different... is that because they are physically different? or because the analogue output is simply giving different…"
Sep 3
MHefny commented on MHefny's blog post ZERO_PID Tunes for Multirotors Part#2
"I have just updated the wobble detection, it is now based only on oscillation frequency. I made some measures that ended up that 30ms oscillation is the upper limit upon which P should be decreased. the saturation is far better by now. chk my…"
Aug 18
Tobias Simon commented on MHefny's blog post ZERO_PID Tunes for Multirotors Part#2
"I think his approach is related to: http://en.wikipedia.org/wiki/Lyapunov_stability"
Aug 18
MHefny commented on MHefny's blog post ZERO_PID Tunes for Multirotors Part#2
"@Tobias Simon  thanks for sharing this link.....yes it seems that code tries to reach the same objective.... I checked the link and found: kpTuningIntergrator += (float)_kp*2*error*_gamma*deltaTime; //Euler intergrator kdTuningIntergrator +=…"
Aug 18
Tobias Simon commented on MHefny's blog post ZERO_PID Tunes for Multirotors Part#2
Aug 18
MHefny commented on MHefny's blog post ZERO_PID Tunes for Multirotors Part#2
"Crashpilot1000 Hi, I added wobble detection here . It mainly detects speed change wave length and peaks, so wobbles are low frequency oscillation, with high amplitude. still need some tuning. I will keep u updated. thanks, M.Hefny"
Aug 17
Crashpilot1000 commented on MHefny's blog post ZERO_PID Tunes for Multirotors Part#2
"Thanks for correting that, but I was just searching the condition where P was reduced in your explanation :) . However both of your cases are needed and the has changed sign condition as well. And it works!!! Here is the working (P only) version of…"
Aug 15

Profile Information

About Me:
I am a computer Engineer, works in software field. However as a hobby I am interested in hardware and autonomous vehicles.
Please tell us a bit about your UAV interest
I am trying to build a UAV that can navigate in closed area.
Hometown:
Cairo

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MHefny's Blog

ZERO_PID Tunes for Multirotors Part#2

Posted on August 7, 2014 at 5:55am 44 Comments

Introduction

 

                From more than a month from now Aug 2014, I posted a blog titled …

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Zero-PIDs Tuner for Multirotors

Posted on June 1, 2014 at 6:30pm 9 Comments

This topic is about PID auto tuning algorithm that can tune your Quadcopter from PIDs ZERO as a start value.

Introduction

       Adjusting PIDs is a problem for many of Quadcopter’ pilots, it would be nice to get your quadcopter to…

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Multiwii v2.3 Working on Arduino DUE

Posted on May 21, 2014 at 4:10pm 2 Comments

Most of us knows Arduino DUE It is a 32-bit ARM processor SAM3X8E that came with alot of expectation that a new era of Quadcopter firmware will be built on it -at least I thought so :) -.

Well that was very inspiring until I found that the new…

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Python Scripting in Mission Planner

Posted on November 11, 2013 at 1:30pm 20 Comments

I like the idea of having a script to your ground station. It is a way to implement some logic that your original GUI does not enable directly. It can also enable integration easily with other dlls and modules far beyond the original scope of the Mission Planner. The first thing I asked myself about when I found this "treasure" is what were the available variables and classes that I can already access, well I could not find a clear list, maybe I am not good at…

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