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MHefny's Discussions

Changing Main frequency of HM-TRP 3DR Radio for Telemetry using AT Commands

Started this discussion. Last reply by Andrew Tridgell 21 hours ago. 10 Replies

I spent some time reading inHM-TRP Series 100mW Transceiver data sheet as well as …Continue

Tags: Commands, AT, Frequencies

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


Developer
Andrew Tridgell replied to MHefny's discussion Changing Main frequency of HM-TRP 3DR Radio for Telemetry using AT Commands
"I'm afraid this doesn't work in any reasonable way (and yes, I did try it a long time ago). Each board has a different analog output stage, with different filtering. So if you run a 915 radio at 433 then you can communicate at very short…"
21 hours ago
MHefny replied to MHefny's discussion Changing Main frequency of HM-TRP 3DR Radio for Telemetry using AT Commands
"seems I misunderstood this sorry :) still I will update you when trying wit the other antenna I plan to make ... I hope it works well."
21 hours ago
Marcin Krawczyk replied to MHefny's discussion Changing Main frequency of HM-TRP 3DR Radio for Telemetry using AT Commands
"I've never stated that the difference is in IC - from begining I told you that difference is in HM-TRP module. That's why HOPE offers different versions for different bands."
21 hours ago
MHefny replied to MHefny's discussion Changing Main frequency of HM-TRP 3DR Radio for Telemetry using AT Commands
"Kindly access this link http://www.silabs.com/Support%20Documents/TechnicalDocs/Si1000.pdf the first page states : Frequency range = 240–960 MHz also page 249/250 table Table 23.3. Frequency Band Selection  that shows…"
21 hours ago
Marcin Krawczyk replied to MHefny's discussion Changing Main frequency of HM-TRP 3DR Radio for Telemetry using AT Commands
"I can't see where datasheet for HM-TRP shows that each vesrion is the same. Each type of HM-TRP module has different L and C elements in antenna circuit. They're factory pre-tuned for frequency band. You can change frequency band "by…"
22 hours ago
MHefny replied to MHefny's discussion Changing Main frequency of HM-TRP 3DR Radio for Telemetry using AT Commands
"Thank you for feedback. regarding "There may be some additional register settings " yes there is and that is why I change g_board_frequency variable and ATZ "reboot' is mandatory. because it is used radio.c file starting from…"
yesterday
Chris Card replied to MHefny's discussion Changing Main frequency of HM-TRP 3DR Radio for Telemetry using AT Commands
"Thanks for the find! When I read this post I was skeptical about changing the RF operating band without changing any components on the circuit board because usually radios have filter circuits which are particular to an operating frequency…"
yesterday
MHefny replied to MHefny's discussion Changing Main frequency of HM-TRP 3DR Radio for Telemetry using AT Commands
"I will try to make a 915MHz antenna, to see if it really works with good ranges or not. "
yesterday
MHefny replied to MHefny's discussion Changing Main frequency of HM-TRP 3DR Radio for Telemetry using AT Commands
"based on data sheet they are the same, also the  code clearly shows that different frequencies are put in select statements and if conditions not [ #ifdef] as it in code such multiwii code that supports different hardware sensors. I have the…"
yesterday
Marcin Krawczyk replied to MHefny's discussion Changing Main frequency of HM-TRP 3DR Radio for Telemetry using AT Commands
"AFAIK each 'type' of board has different antenna circuit, so it's not reasonable to use i. e. 433 radio as 915..."
yesterday
MHefny posted a discussion

Changing Main frequency of HM-TRP 3DR Radio for Telemetry using AT Commands

I spent some time reading inHM-TRP Series 100mW Transceiver data sheet as well as SiK source code I wanted to know that if the 433MHz and 913 MHz is something fixed in the chip, that is why modules are sold either 433 or 913 or it is something you can change EASILY :)Luckly I found that frequency is something not fixed, however in the source code of SiK,…See More
Wednesday
MHefny replied to Marcin Krawczyk's discussion HM-TRP 868 vs. 3DR Radio Config 0.9
"I have just found this function in radio.c  set_frequency_registers EZRADIOPRO_HBSEL I believe this is the answer am I right"
Jul 17
MHefny replied to Marcin Krawczyk's discussion HM-TRP 868 vs. 3DR Radio Config 0.9
"I have a question .....  using a telemetry of 433 MHz can I change frequency to 900MHz  internally using firmware or this is a hardware feature ... the datasheet says that "Frequency range = 240–960 MHz" so are there…"
Jul 17
MHefny replied to Andrew Tridgell's discussion Welcome to the 3DR Radio forum!
"I want to compile the  firmware of this module. I used http://www.silabs.com/support/pages/software-downloads.aspx Silabs compiler. But nothing straight forward. ... is there a guidance for compiling this firmware. Best Regards, M. Hefny"
Jul 8
MHefny replied to Phillip Schmidt's discussion Arduino Due Multi-Copter I/O Shield
Jun 8
MHefny commented on MHefny's blog post Multiwii v2.3 Working on Arduino DUE
"Thank you :)"
Jun 7

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-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 16 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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My Tilt-Tricopter on Gears

Posted on July 15, 2013 at 6:00pm 2 Comments

I built a Tricopter that front motors can tilt forward to gain speed.

I also added gears so that It can take-off and land like a plane !!!

Motors also can tilt-backward so it looks like a Scorpion with high tails and can move backward on gears .

 

 …

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